feat: password protected profiles

2026-05-11 12:27:12 +02:00 · 2026-05-10 04:32:59 +04:00
parent 5bff4438f0
commit b4a8fd04d8
28 changed files with 3253 additions and 44 deletions
@@ -171,10 +171,21 @@ async function startMinio(minioBin) {

 async function buildDonutSync() {
  log("Building donut-sync...");
+  // `nest build` runs incremental tsc, which silently skips emit when
+  // tsconfig.build.tsbuildinfo says nothing changed — even if dist/ was
+  // wiped. Drop the cache so we always produce a fresh dist.
+  const syncDir = path.join(ROOT_DIR, "donut-sync");
+  await rm(path.join(syncDir, "tsconfig.build.tsbuildinfo"), {
+    force: true,
+  });
+  await rm(path.join(syncDir, "dist"), { recursive: true, force: true });
  execSync("pnpm build", {
-    cwd: path.join(ROOT_DIR, "donut-sync"),
+    cwd: syncDir,
    stdio: process.env.VERBOSE ? "inherit" : "ignore",
  });
+  if (!existsSync(path.join(syncDir, "dist", "main.js"))) {
+    throw new Error("donut-sync build did not produce dist/main.js");
+  }
  log("donut-sync built");
 }

@@ -701,6 +701,7 @@ mod tests {
      created_by_id: None,
      created_by_email: None,
      dns_blocklist: None,
+      password_protected: false,
    }
  }

@@ -1218,6 +1218,7 @@ mod tests {
      created_by_id: None,
      created_by_email: None,
      dns_blocklist: None,
+      password_protected: false,
    };

    let path = profile.get_profile_data_path(&profiles_dir);
@@ -291,8 +291,12 @@ impl BrowserRunner {
        );
      }

-      // Create ephemeral dir for ephemeral profiles
-      let override_profile_path = if profile.ephemeral {
+      // Create ephemeral dir for ephemeral or password-protected profiles
+      let override_profile_path = if profile.password_protected {
+        let dir = crate::profile::password::prepare_for_launch(profile)
+          .map_err(|e| -> Box<dyn std::error::Error + Send + Sync> { e.into() })?;
+        Some(dir)
+      } else if profile.ephemeral {
        let dir = crate::ephemeral_dirs::create_ephemeral_dir(&profile.id.to_string())
          .map_err(|e| -> Box<dyn std::error::Error + Send + Sync> { e.into() })?;
        Some(dir)
@@ -542,8 +546,11 @@ impl BrowserRunner {
        );
      }

-      // Create ephemeral dir for ephemeral profiles
-      if profile.ephemeral {
+      // Create ephemeral dir for ephemeral or password-protected profiles
+      if profile.password_protected {
+        crate::profile::password::prepare_for_launch(profile)
+          .map_err(|e| -> Box<dyn std::error::Error + Send + Sync> { e.into() })?;
+      } else if profile.ephemeral {
        crate::ephemeral_dirs::create_ephemeral_dir(&profile.id.to_string())
          .map_err(|e| -> Box<dyn std::error::Error + Send + Sync> { e.into() })?;
      }
@@ -1431,7 +1438,9 @@ impl BrowserRunner {
        );
      }

-      if profile.ephemeral {
+      if profile.password_protected {
+        crate::profile::password::complete_after_quit(profile);
+      } else if profile.ephemeral {
        crate::ephemeral_dirs::remove_ephemeral_dir(&profile.id.to_string());
      }

@@ -1771,7 +1780,9 @@ impl BrowserRunner {
        );
      }

-      if profile.ephemeral {
+      if profile.password_protected {
+        crate::profile::password::complete_after_quit(profile);
+      } else if profile.ephemeral {
        crate::ephemeral_dirs::remove_ephemeral_dir(&profile.id.to_string());
      }

@@ -240,7 +240,7 @@ fn cleanup_legacy_dirs() {
 }

 pub fn get_effective_profile_path(profile: &BrowserProfile, profiles_dir: &Path) -> PathBuf {
-  if profile.ephemeral {
+  if profile.ephemeral || profile.password_protected {
    if let Some(dir) = get_ephemeral_dir(&profile.id.to_string()) {
      return dir;
    }
@@ -279,6 +279,7 @@ mod tests {
      created_by_id: None,
      created_by_email: None,
      dns_blocklist: None,
+      password_protected: false,
    }
  }

@@ -72,6 +72,11 @@ use profile::manager::{
  update_wayfern_config,
 };

+use profile::password::{
+  change_profile_password, is_profile_locked, lock_profile, remove_profile_password,
+  set_profile_password, unlock_profile,
+};
+
 use browser_version_manager::{
  fetch_browser_versions_cached_first, fetch_browser_versions_with_count,
  fetch_browser_versions_with_count_cached_first, get_supported_browsers,
@@ -1133,6 +1138,7 @@ async fn generate_sample_fingerprint(
    created_by_id: None,
    created_by_email: None,
    dns_blocklist: None,
+    password_protected: false,
  };

  if browser == "camoufox" {
@@ -1769,6 +1775,13 @@ pub fn run() {
                    }
                  }

+                  // Re-encrypt password-protected profiles when the browser
+                  // exits naturally (user closing the window) — the explicit
+                  // kill path in browser_runner.rs handles app-driven stops.
+                  if !is_running && profile.password_protected {
+                    crate::profile::password::complete_after_quit(&profile);
+                  }
+
                  last_running_states.insert(profile_id, is_running);
                } else {
                  // Update the state even if unchanged to ensure we have it tracked
@@ -2092,6 +2105,13 @@ pub fn run() {
      // DNS blocklist commands
      dns_blocklist::get_dns_blocklist_cache_status,
      dns_blocklist::refresh_dns_blocklists,
+      // Profile password commands
+      set_profile_password,
+      change_profile_password,
+      remove_profile_password,
+      unlock_profile,
+      lock_profile,
+      is_profile_locked,
    ])
    .build(tauri::generate_context!())
    .expect("error while building tauri application")
@@ -2138,6 +2158,7 @@ mod tests {
      "generate_sample_fingerprint",
      "cloud_get_wayfern_token",
      "cloud_refresh_wayfern_token",
+      "lock_profile",
    ];

    // Extract command names from the generate_handler! macro in this file
@@ -0,0 +1,702 @@
+//! Per-file encryption for password-protected profiles.
+//!
+//! Each on-disk file in `profiles/{uuid}/profile/` has:
+//! - **Filename**: `urlsafe_no_pad(HMAC-SHA256(profile_key, plaintext_relpath))[..32]`.
+//!   Deterministic so cross-machine sync sees stable filenames; same plaintext
+//!   path with same key always produces the same on-disk name.
+//! - **Content**: `nonce(12B) || AES-256-GCM(profile_key, path_len(2B-LE) || plaintext_path || file_bytes)`.
+//!   The plaintext relpath is encoded inside the ciphertext so a launch can
+//!   reconstruct the directory tree without a separate manifest.
+//!
+//! Wrong password fails the AES-GCM auth tag on the first decrypt, which
+//! doubles as password verification.
+
+use base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine as _};
+use globset::{Glob, GlobSet, GlobSetBuilder};
+use ring::hmac;
+use std::collections::HashMap;
+use std::collections::HashSet;
+use std::path::{Path, PathBuf};
+use std::sync::Mutex;
+use std::time::SystemTime;
+
+use crate::sync::encryption::{decrypt_bytes, derive_profile_key, encrypt_bytes, generate_salt};
+
+/// Length of the on-disk HMAC filename in chars.
+const HMAC_FILENAME_LEN: usize = 32;
+
+/// Marker file written into encrypted profile dirs so launch code can verify
+/// the password before attempting to decrypt actual user data files.
+const VERIFY_FILE_NAME: &str = ".donut-pw-verify";
+const VERIFY_FILE_PATH: &str = "__donut_pw_verify__";
+
+lazy_static::lazy_static! {
+  /// In-memory cache of derived per-profile encryption keys, keyed by profile UUID.
+  /// Only populated while a profile is unlocked / running. Never persisted.
+  static ref KEY_CACHE: Mutex<HashMap<uuid::Uuid, [u8; 32]>> = Mutex::new(HashMap::new());
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum PasswordError {
+  #[error("io error: {0}")]
+  Io(String),
+  #[error("encryption error: {0}")]
+  Encryption(String),
+  #[error("invalid password")]
+  WrongPassword,
+  #[error("invalid file format")]
+  InvalidFormat,
+}
+
+pub type PasswordResult<T> = Result<T, PasswordError>;
+
+impl From<std::io::Error> for PasswordError {
+  fn from(e: std::io::Error) -> Self {
+    PasswordError::Io(e.to_string())
+  }
+}
+
+/// Compute the HMAC-SHA256 derived on-disk filename for a plaintext relative path.
+pub fn hmac_filename(key: &[u8; 32], plaintext_relpath: &str) -> String {
+  let signing_key = hmac::Key::new(hmac::HMAC_SHA256, key);
+  let tag = hmac::sign(&signing_key, plaintext_relpath.as_bytes());
+  let encoded = URL_SAFE_NO_PAD.encode(tag.as_ref());
+  encoded.chars().take(HMAC_FILENAME_LEN).collect()
+}
+
+/// Encrypt a single file's contents with its plaintext relative path embedded.
+pub fn encrypt_profile_file(
+  key: &[u8; 32],
+  plaintext_relpath: &str,
+  file_bytes: &[u8],
+) -> PasswordResult<Vec<u8>> {
+  let path_bytes = plaintext_relpath.as_bytes();
+  if path_bytes.len() > u16::MAX as usize {
+    return Err(PasswordError::Encryption("relpath too long".into()));
+  }
+  let mut plaintext = Vec::with_capacity(2 + path_bytes.len() + file_bytes.len());
+  plaintext.extend_from_slice(&(path_bytes.len() as u16).to_le_bytes());
+  plaintext.extend_from_slice(path_bytes);
+  plaintext.extend_from_slice(file_bytes);
+  encrypt_bytes(key, &plaintext).map_err(PasswordError::Encryption)
+}
+
+/// Decrypt one file's bytes back into `(plaintext_relpath, file_bytes)`.
+pub fn decrypt_profile_file(
+  key: &[u8; 32],
+  encrypted_bytes: &[u8],
+) -> PasswordResult<(String, Vec<u8>)> {
+  let plaintext = decrypt_bytes(key, encrypted_bytes).map_err(|_| PasswordError::WrongPassword)?;
+  if plaintext.len() < 2 {
+    return Err(PasswordError::InvalidFormat);
+  }
+  let path_len = u16::from_le_bytes([plaintext[0], plaintext[1]]) as usize;
+  if plaintext.len() < 2 + path_len {
+    return Err(PasswordError::InvalidFormat);
+  }
+  let path = std::str::from_utf8(&plaintext[2..2 + path_len])
+    .map_err(|_| PasswordError::InvalidFormat)?
+    .to_string();
+  let content = plaintext[2 + path_len..].to_vec();
+  Ok((path, content))
+}
+
+fn build_excludes(patterns: &[&str]) -> GlobSet {
+  let mut builder = GlobSetBuilder::new();
+  for p in patterns {
+    if let Ok(g) = Glob::new(p) {
+      builder.add(g);
+    }
+  }
+  builder.build().unwrap_or_else(|_| GlobSet::empty())
+}
+
+fn walk_files(
+  base: &Path,
+  current: &Path,
+  excludes: &GlobSet,
+  out: &mut Vec<(String, PathBuf)>,
+) -> std::io::Result<()> {
+  for entry in std::fs::read_dir(current)? {
+    let entry = entry?;
+    let path = entry.path();
+    let relative = path
+      .strip_prefix(base)
+      .map(|p| p.to_string_lossy().replace('\\', "/"))
+      .unwrap_or_default();
+
+    if excludes.is_match(&relative) {
+      continue;
+    }
+
+    let metadata = match entry.metadata() {
+      Ok(m) => m,
+      Err(_) => continue,
+    };
+
+    if metadata.is_dir() {
+      walk_files(base, &path, excludes, out)?;
+    } else if metadata.is_file() {
+      out.push((relative, path));
+    }
+  }
+  Ok(())
+}
+
+fn atomic_write(path: &Path, data: &[u8]) -> std::io::Result<()> {
+  if let Some(parent) = path.parent() {
+    std::fs::create_dir_all(parent)?;
+  }
+  let tmp = path.with_extension("donut-tmp");
+  std::fs::write(&tmp, data)?;
+  std::fs::rename(&tmp, path)
+}
+
+fn write_verifier(key: &[u8; 32], encrypted_dir: &Path) -> PasswordResult<()> {
+  let encrypted = encrypt_profile_file(key, VERIFY_FILE_PATH, b"donut-verify")?;
+  let path = encrypted_dir.join(VERIFY_FILE_NAME);
+  atomic_write(&path, &encrypted)?;
+  Ok(())
+}
+
+/// Verify a derived key against an encrypted profile dir. Returns Ok(()) on
+/// success, `Err(WrongPassword)` if the password is wrong, or another error
+/// for I/O / format problems.
+pub fn verify_key_against_dir(key: &[u8; 32], encrypted_dir: &Path) -> PasswordResult<()> {
+  let path = encrypted_dir.join(VERIFY_FILE_NAME);
+  if !path.exists() {
+    return Err(PasswordError::InvalidFormat);
+  }
+  let bytes = std::fs::read(&path)?;
+  let (relpath, content) = decrypt_profile_file(key, &bytes)?;
+  if relpath != VERIFY_FILE_PATH || content != b"donut-verify" {
+    return Err(PasswordError::InvalidFormat);
+  }
+  Ok(())
+}
+
+/// Encrypt every file under `plaintext_dir` into `encrypted_dir`, replacing
+/// it. Files matching `exclude_patterns` are dropped.
+pub fn encrypt_profile_dir(
+  key: &[u8; 32],
+  plaintext_dir: &Path,
+  encrypted_dir: &Path,
+  exclude_patterns: &[&str],
+) -> PasswordResult<()> {
+  if encrypted_dir.exists() {
+    std::fs::remove_dir_all(encrypted_dir)?;
+  }
+  std::fs::create_dir_all(encrypted_dir)?;
+
+  let excludes = build_excludes(exclude_patterns);
+  let mut files = Vec::new();
+  if plaintext_dir.exists() {
+    walk_files(plaintext_dir, plaintext_dir, &excludes, &mut files)?;
+  }
+
+  for (relpath, abs) in files {
+    let bytes = std::fs::read(&abs)?;
+    let encrypted = encrypt_profile_file(key, &relpath, &bytes)?;
+    let on_disk = encrypted_dir.join(hmac_filename(key, &relpath));
+    atomic_write(&on_disk, &encrypted)?;
+  }
+
+  write_verifier(key, encrypted_dir)?;
+  Ok(())
+}
+
+/// Decrypt every file in `encrypted_dir` back into `plaintext_dir` (which is
+/// created if missing). Returns the per-file mtimes captured after writing,
+/// keyed by plaintext relpath. Caller can use them as the "before-launch"
+/// snapshot to skip unchanged files on re-encrypt.
+pub fn decrypt_profile_dir(
+  key: &[u8; 32],
+  encrypted_dir: &Path,
+  plaintext_dir: &Path,
+) -> PasswordResult<HashMap<String, SystemTime>> {
+  std::fs::create_dir_all(plaintext_dir)?;
+  let mut mtimes = HashMap::new();
+
+  let entries: Vec<_> = std::fs::read_dir(encrypted_dir)?
+    .filter_map(|r| r.ok())
+    .collect();
+
+  for entry in entries {
+    let path = entry.path();
+    if !path.is_file() {
+      continue;
+    }
+    let name = match path.file_name().and_then(|n| n.to_str()) {
+      Some(n) => n,
+      None => continue,
+    };
+    if name == VERIFY_FILE_NAME {
+      continue;
+    }
+    let bytes = std::fs::read(&path)?;
+    let (relpath, content) = decrypt_profile_file(key, &bytes)?;
+    let dest = plaintext_dir.join(&relpath);
+    if let Some(parent) = dest.parent() {
+      std::fs::create_dir_all(parent)?;
+    }
+    std::fs::write(&dest, &content)?;
+    if let Ok(m) = dest.metadata().and_then(|m| m.modified()) {
+      mtimes.insert(relpath, m);
+    }
+  }
+
+  Ok(mtimes)
+}
+
+/// Re-encrypt the contents of `plaintext_dir` back into `encrypted_dir`,
+/// preserving on-disk filenames for files whose plaintext content didn't
+/// change. Returns the number of files re-encrypted.
+///
+/// `before_launch_mtimes` is the snapshot captured by `decrypt_profile_dir`.
+/// Files whose mtime hasn't moved are left untouched on disk.
+pub fn reencrypt_changed_files(
+  key: &[u8; 32],
+  plaintext_dir: &Path,
+  encrypted_dir: &Path,
+  exclude_patterns: &[&str],
+  before_launch_mtimes: &HashMap<String, SystemTime>,
+) -> PasswordResult<usize> {
+  std::fs::create_dir_all(encrypted_dir)?;
+  let excludes = build_excludes(exclude_patterns);
+
+  let mut current_files = Vec::new();
+  if plaintext_dir.exists() {
+    walk_files(plaintext_dir, plaintext_dir, &excludes, &mut current_files)?;
+  }
+
+  let mut current_paths: HashSet<String> = HashSet::new();
+  let mut rewrote = 0usize;
+  for (relpath, abs) in current_files {
+    current_paths.insert(relpath.clone());
+
+    let cur_mtime = abs.metadata().and_then(|m| m.modified()).ok();
+    let unchanged = match (cur_mtime, before_launch_mtimes.get(&relpath)) {
+      (Some(now), Some(before)) => now == *before,
+      _ => false,
+    };
+    if unchanged {
+      continue;
+    }
+
+    let bytes = std::fs::read(&abs)?;
+    let encrypted = encrypt_profile_file(key, &relpath, &bytes)?;
+    let on_disk = encrypted_dir.join(hmac_filename(key, &relpath));
+    atomic_write(&on_disk, &encrypted)?;
+    rewrote += 1;
+  }
+
+  // Delete on-disk files for plaintext paths that no longer exist
+  let valid_names: HashSet<String> = current_paths
+    .iter()
+    .map(|p| hmac_filename(key, p))
+    .collect();
+
+  for entry in std::fs::read_dir(encrypted_dir)?.flatten() {
+    let path = entry.path();
+    if !path.is_file() {
+      continue;
+    }
+    let name = match path.file_name().and_then(|n| n.to_str()) {
+      Some(n) => n.to_string(),
+      None => continue,
+    };
+    if name == VERIFY_FILE_NAME {
+      continue;
+    }
+    if !valid_names.contains(&name) {
+      let _ = std::fs::remove_file(&path);
+    }
+  }
+
+  write_verifier(key, encrypted_dir)?;
+  Ok(rewrote)
+}
+
+/// Re-encrypt every file under `encrypted_dir` from `old_key` to `new_key` in
+/// place. Used when changing a profile password without launching it.
+pub fn rekey_profile_dir(
+  old_key: &[u8; 32],
+  new_key: &[u8; 32],
+  encrypted_dir: &Path,
+) -> PasswordResult<()> {
+  let entries: Vec<_> = std::fs::read_dir(encrypted_dir)?
+    .filter_map(|r| r.ok())
+    .collect();
+
+  let mut decrypted: Vec<(String, Vec<u8>)> = Vec::new();
+  for entry in &entries {
+    let path = entry.path();
+    if !path.is_file() {
+      continue;
+    }
+    let name = match path.file_name().and_then(|n| n.to_str()) {
+      Some(n) => n,
+      None => continue,
+    };
+    if name == VERIFY_FILE_NAME {
+      continue;
+    }
+    let bytes = std::fs::read(&path)?;
+    let (relpath, content) = decrypt_profile_file(old_key, &bytes)?;
+    decrypted.push((relpath, content));
+  }
+
+  // Decryption succeeded for every file; safe to rewrite the directory.
+  for entry in entries {
+    let path = entry.path();
+    if path.is_file() {
+      let _ = std::fs::remove_file(&path);
+    }
+  }
+
+  for (relpath, content) in decrypted {
+    let encrypted = encrypt_profile_file(new_key, &relpath, &content)?;
+    let on_disk = encrypted_dir.join(hmac_filename(new_key, &relpath));
+    atomic_write(&on_disk, &encrypted)?;
+  }
+
+  write_verifier(new_key, encrypted_dir)?;
+  Ok(())
+}
+
+// ---------- key cache ----------
+
+pub fn cache_key(profile_id: uuid::Uuid, key: [u8; 32]) {
+  if let Ok(mut guard) = KEY_CACHE.lock() {
+    guard.insert(profile_id, key);
+  }
+}
+
+pub fn get_cached_key(profile_id: &uuid::Uuid) -> Option<[u8; 32]> {
+  KEY_CACHE.lock().ok()?.get(profile_id).copied()
+}
+
+pub fn drop_cached_key(profile_id: &uuid::Uuid) {
+  if let Ok(mut guard) = KEY_CACHE.lock() {
+    guard.remove(profile_id);
+  }
+}
+
+pub fn has_cached_key(profile_id: &uuid::Uuid) -> bool {
+  KEY_CACHE
+    .lock()
+    .map(|g| g.contains_key(profile_id))
+    .unwrap_or(false)
+}
+
+/// Convenience: derive + verify against the encrypted dir + cache the key on success.
+pub fn unlock(
+  profile_id: uuid::Uuid,
+  password: &str,
+  salt: &str,
+  encrypted_dir: &Path,
+) -> PasswordResult<()> {
+  let key = derive_profile_key(password, salt).map_err(PasswordError::Encryption)?;
+  verify_key_against_dir(&key, encrypted_dir)?;
+  cache_key(profile_id, key);
+  Ok(())
+}
+
+pub fn fresh_salt() -> String {
+  generate_salt()
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use tempfile::TempDir;
+
+  fn make_key() -> [u8; 32] {
+    derive_profile_key("hunter2", &generate_salt()).unwrap()
+  }
+
+  #[test]
+  fn test_hmac_filename_deterministic() {
+    let key = [7u8; 32];
+    let a = hmac_filename(&key, "Default/Cookies");
+    let b = hmac_filename(&key, "Default/Cookies");
+    assert_eq!(a, b);
+    assert_eq!(a.len(), HMAC_FILENAME_LEN);
+  }
+
+  #[test]
+  fn test_hmac_filename_different_keys() {
+    let a = hmac_filename(&[1u8; 32], "Default/Cookies");
+    let b = hmac_filename(&[2u8; 32], "Default/Cookies");
+    assert_ne!(a, b);
+  }
+
+  #[test]
+  fn test_hmac_filename_different_paths() {
+    let key = [1u8; 32];
+    let a = hmac_filename(&key, "Default/Cookies");
+    let b = hmac_filename(&key, "Default/Login Data");
+    assert_ne!(a, b);
+  }
+
+  #[test]
+  fn test_file_roundtrip() {
+    let key = make_key();
+    let original = b"hello world".to_vec();
+    let encrypted = encrypt_profile_file(&key, "Default/Cookies", &original).unwrap();
+    let (path, content) = decrypt_profile_file(&key, &encrypted).unwrap();
+    assert_eq!(path, "Default/Cookies");
+    assert_eq!(content, original);
+  }
+
+  #[test]
+  fn test_file_wrong_key_fails() {
+    let key1 = make_key();
+    let key2 = make_key();
+    let encrypted = encrypt_profile_file(&key1, "Cookies", b"data").unwrap();
+    assert!(matches!(
+      decrypt_profile_file(&key2, &encrypted),
+      Err(PasswordError::WrongPassword)
+    ));
+  }
+
+  #[test]
+  fn test_file_truncated_ciphertext() {
+    let key = make_key();
+    let encrypted = encrypt_profile_file(&key, "x", b"y").unwrap();
+    // Drop the auth tag
+    let truncated = &encrypted[..encrypted.len() - 1];
+    assert!(decrypt_profile_file(&key, truncated).is_err());
+  }
+
+  #[test]
+  fn test_dir_roundtrip() {
+    let key = make_key();
+    let work = TempDir::new().unwrap();
+    let plain = work.path().join("plain");
+    let enc = work.path().join("enc");
+    std::fs::create_dir_all(plain.join("Default")).unwrap();
+    std::fs::write(plain.join("Default/Cookies"), b"sqlite-data").unwrap();
+    std::fs::write(plain.join("Default/Bookmarks"), b"{\"x\":1}").unwrap();
+    std::fs::write(plain.join("Local State"), b"state").unwrap();
+
+    encrypt_profile_dir(&key, &plain, &enc, &[]).unwrap();
+
+    // No plaintext filenames on disk
+    let names: Vec<String> = std::fs::read_dir(&enc)
+      .unwrap()
+      .filter_map(|e| e.ok())
+      .map(|e| e.file_name().to_string_lossy().into_owned())
+      .collect();
+    for n in &names {
+      assert!(!n.contains("Cookies"), "plaintext leaked: {n}");
+      assert!(!n.contains("Bookmarks"));
+      assert!(!n.contains("Local State"));
+    }
+
+    // Verify file present
+    assert!(enc.join(VERIFY_FILE_NAME).exists());
+
+    let restored = work.path().join("restored");
+    let mtimes = decrypt_profile_dir(&key, &enc, &restored).unwrap();
+    assert_eq!(mtimes.len(), 3);
+
+    assert_eq!(
+      std::fs::read(restored.join("Default/Cookies")).unwrap(),
+      b"sqlite-data"
+    );
+    assert_eq!(
+      std::fs::read(restored.join("Default/Bookmarks")).unwrap(),
+      b"{\"x\":1}"
+    );
+    assert_eq!(
+      std::fs::read(restored.join("Local State")).unwrap(),
+      b"state"
+    );
+  }
+
+  #[test]
+  fn test_dir_excludes() {
+    let key = make_key();
+    let work = TempDir::new().unwrap();
+    let plain = work.path().join("plain");
+    let enc = work.path().join("enc");
+    std::fs::create_dir_all(plain.join("Default/Cache")).unwrap();
+    std::fs::write(plain.join("Default/Cookies"), b"keep").unwrap();
+    std::fs::write(plain.join("Default/Cache/data"), b"drop").unwrap();
+
+    encrypt_profile_dir(&key, &plain, &enc, &["**/Cache/**"]).unwrap();
+
+    let restored = work.path().join("restored");
+    let mtimes = decrypt_profile_dir(&key, &enc, &restored).unwrap();
+
+    // Only Cookies (1 file) should be present, not Cache contents
+    assert_eq!(mtimes.len(), 1);
+    assert!(mtimes.contains_key("Default/Cookies"));
+    assert!(restored.join("Default/Cookies").exists());
+    assert!(!restored.join("Default/Cache/data").exists());
+  }
+
+  #[test]
+  fn test_verify_against_wrong_key() {
+    let key1 = make_key();
+    let key2 = make_key();
+    let work = TempDir::new().unwrap();
+    let plain = work.path().join("plain");
+    let enc = work.path().join("enc");
+    std::fs::create_dir_all(&plain).unwrap();
+    std::fs::write(plain.join("file"), b"data").unwrap();
+    encrypt_profile_dir(&key1, &plain, &enc, &[]).unwrap();
+    assert!(verify_key_against_dir(&key1, &enc).is_ok());
+    assert!(matches!(
+      verify_key_against_dir(&key2, &enc),
+      Err(PasswordError::WrongPassword)
+    ));
+  }
+
+  #[test]
+  fn test_reencrypt_skips_unchanged() {
+    let key = make_key();
+    let work = TempDir::new().unwrap();
+    let plain = work.path().join("plain");
+    let enc = work.path().join("enc");
+    std::fs::create_dir_all(&plain).unwrap();
+    std::fs::write(plain.join("a"), b"AAA").unwrap();
+    std::fs::write(plain.join("b"), b"BBB").unwrap();
+    encrypt_profile_dir(&key, &plain, &enc, &[]).unwrap();
+
+    let restored = work.path().join("restored");
+    let snapshot = decrypt_profile_dir(&key, &enc, &restored).unwrap();
+
+    // Capture pre-rewrite ciphertext bytes
+    let name_a = hmac_filename(&key, "a");
+    let name_b = hmac_filename(&key, "b");
+    let cipher_a_before = std::fs::read(enc.join(&name_a)).unwrap();
+    let cipher_b_before = std::fs::read(enc.join(&name_b)).unwrap();
+
+    // Modify only "a" in the restored tree
+    std::thread::sleep(std::time::Duration::from_millis(1100));
+    std::fs::write(restored.join("a"), b"AAA-CHANGED").unwrap();
+
+    let rewrote = reencrypt_changed_files(&key, &restored, &enc, &[], &snapshot).unwrap();
+    assert_eq!(rewrote, 1);
+
+    let cipher_a_after = std::fs::read(enc.join(&name_a)).unwrap();
+    let cipher_b_after = std::fs::read(enc.join(&name_b)).unwrap();
+    assert_ne!(
+      cipher_a_before, cipher_a_after,
+      "changed file should have new ciphertext"
+    );
+    assert_eq!(
+      cipher_b_before, cipher_b_after,
+      "unchanged file should have stable ciphertext"
+    );
+  }
+
+  #[test]
+  fn test_reencrypt_handles_added_and_removed() {
+    let key = make_key();
+    let work = TempDir::new().unwrap();
+    let plain = work.path().join("plain");
+    let enc = work.path().join("enc");
+    std::fs::create_dir_all(&plain).unwrap();
+    std::fs::write(plain.join("keep"), b"k").unwrap();
+    std::fs::write(plain.join("delete"), b"d").unwrap();
+    encrypt_profile_dir(&key, &plain, &enc, &[]).unwrap();
+
+    let restored = work.path().join("restored");
+    let snapshot = decrypt_profile_dir(&key, &enc, &restored).unwrap();
+
+    std::fs::remove_file(restored.join("delete")).unwrap();
+    std::fs::write(restored.join("new"), b"n").unwrap();
+
+    reencrypt_changed_files(&key, &restored, &enc, &[], &snapshot).unwrap();
+
+    let names: HashSet<String> = std::fs::read_dir(&enc)
+      .unwrap()
+      .filter_map(|e| e.ok())
+      .map(|e| e.file_name().to_string_lossy().into_owned())
+      .collect();
+
+    assert!(names.contains(&hmac_filename(&key, "keep")));
+    assert!(names.contains(&hmac_filename(&key, "new")));
+    assert!(!names.contains(&hmac_filename(&key, "delete")));
+    assert!(names.contains(VERIFY_FILE_NAME));
+  }
+
+  #[test]
+  fn test_rekey_changes_filenames_and_content() {
+    let old = make_key();
+    let new = make_key();
+    let work = TempDir::new().unwrap();
+    let plain = work.path().join("plain");
+    let enc = work.path().join("enc");
+    std::fs::create_dir_all(&plain).unwrap();
+    std::fs::write(plain.join("x"), b"data").unwrap();
+    encrypt_profile_dir(&old, &plain, &enc, &[]).unwrap();
+
+    let old_name = hmac_filename(&old, "x");
+    let new_name = hmac_filename(&new, "x");
+    assert_ne!(old_name, new_name);
+
+    rekey_profile_dir(&old, &new, &enc).unwrap();
+
+    assert!(!enc.join(&old_name).exists());
+    assert!(enc.join(&new_name).exists());
+    verify_key_against_dir(&new, &enc).unwrap();
+    assert!(matches!(
+      verify_key_against_dir(&old, &enc),
+      Err(PasswordError::WrongPassword)
+    ));
+
+    let restored = work.path().join("restored");
+    decrypt_profile_dir(&new, &enc, &restored).unwrap();
+    assert_eq!(std::fs::read(restored.join("x")).unwrap(), b"data");
+  }
+
+  #[test]
+  fn test_atomic_write_leaves_original_intact_if_tmp_lingers() {
+    let work = TempDir::new().unwrap();
+    let target = work.path().join("file");
+    std::fs::write(&target, b"original").unwrap();
+
+    // Simulate a stale tmp from a crashed write
+    std::fs::write(target.with_extension("donut-tmp"), b"partial").unwrap();
+
+    // A successful write should overwrite the original even when stale tmp exists
+    atomic_write(&target, b"new").unwrap();
+    assert_eq!(std::fs::read(&target).unwrap(), b"new");
+  }
+
+  #[test]
+  fn test_key_cache_lifecycle() {
+    let id = uuid::Uuid::new_v4();
+    assert!(!has_cached_key(&id));
+    cache_key(id, [9u8; 32]);
+    assert!(has_cached_key(&id));
+    assert_eq!(get_cached_key(&id), Some([9u8; 32]));
+    drop_cached_key(&id);
+    assert!(!has_cached_key(&id));
+  }
+
+  #[test]
+  fn test_unlock_helper() {
+    let work = TempDir::new().unwrap();
+    let plain = work.path().join("plain");
+    let enc = work.path().join("enc");
+    std::fs::create_dir_all(&plain).unwrap();
+    std::fs::write(plain.join("x"), b"data").unwrap();
+
+    let salt = generate_salt();
+    let key = derive_profile_key("correct horse", &salt).unwrap();
+    encrypt_profile_dir(&key, &plain, &enc, &[]).unwrap();
+
+    let id = uuid::Uuid::new_v4();
+    drop_cached_key(&id);
+    assert!(unlock(id, "wrong", &salt, &enc).is_err());
+    assert!(!has_cached_key(&id));
+    assert!(unlock(id, "correct horse", &salt, &enc).is_ok());
+    assert!(has_cached_key(&id));
+    drop_cached_key(&id);
+  }
+}
@@ -184,6 +184,7 @@ impl ProfileManager {
          created_by_id: None,
          created_by_email: None,
          dns_blocklist: None,
+          password_protected: false,
        };

        match self
@@ -285,6 +286,7 @@ impl ProfileManager {
          created_by_id: None,
          created_by_email: None,
          dns_blocklist: None,
+          password_protected: false,
        };

        match self
@@ -340,6 +342,7 @@ impl ProfileManager {
      created_by_id: None,
      created_by_email: None,
      dns_blocklist,
+      password_protected: false,
    };

    // Save profile info
@@ -987,6 +990,7 @@ impl ProfileManager {
      created_by_id: None,
      created_by_email: None,
      dns_blocklist: source.dns_blocklist,
+      password_protected: false,
    };

    self.save_profile(&new_profile)?;
@@ -1,4 +1,6 @@
+pub mod encryption;
 pub mod manager;
+pub mod password;
 pub mod types;

 pub use manager::ProfileManager;
@@ -69,6 +69,10 @@ pub struct BrowserProfile {
  pub created_by_email: Option<String>,
  #[serde(default)]
  pub dns_blocklist: Option<String>,
+  /// True when the on-disk profile dir is encrypted with a per-profile password.
+  /// Decryption goes to a RAM-backed ephemeral dir, never to disk.
+  #[serde(default)]
+  pub password_protected: bool,
 }

 pub fn default_release_type() -> String {
@@ -584,6 +584,7 @@ impl ProfileImporter {
          created_by_id: None,
          created_by_email: None,
          dns_blocklist: None,
+          password_protected: false,
        };

        match self
@@ -664,6 +665,7 @@ impl ProfileImporter {
          created_by_id: None,
          created_by_email: None,
          dns_blocklist: None,
+          password_protected: false,
        };

        match self
@@ -715,6 +717,7 @@ impl ProfileImporter {
      created_by_id: None,
      created_by_email: None,
      dns_blocklist: None,
+      password_protected: false,
    };

    self.profile_manager.save_profile(&profile)?;
@@ -57,6 +57,11 @@ pub struct AppSettings {
  pub window_resize_warning_dismissed: bool,
  #[serde(default)]
  pub disable_auto_updates: bool,
+  /// When true, the decrypted in-RAM copy of a password-protected profile is
+  /// preserved between launches for faster subsequent startups. The on-disk
+  /// copy is always re-encrypted regardless of this flag.
+  #[serde(default)]
+  pub keep_decrypted_profiles_in_ram: bool,
 }

 #[derive(Debug, Serialize, Deserialize, Clone, Default)]
@@ -92,6 +97,7 @@ impl Default for AppSettings {
      language: None,
      window_resize_warning_dismissed: false,
      disable_auto_updates: false,
+      keep_decrypted_profiles_in_ram: false,
    }
  }
 }
@@ -1070,6 +1076,7 @@ mod tests {
      language: None,
      window_resize_warning_dismissed: false,
      disable_auto_updates: false,
+      keep_decrypted_profiles_in_ram: false,
    };

    let save_result = manager.save_settings(&test_settings);
@@ -24,6 +24,10 @@ import { IntegrationsDialog } from "@/components/integrations-dialog";
 import { LaunchOnLoginDialog } from "@/components/launch-on-login-dialog";
 import { PermissionDialog } from "@/components/permission-dialog";
 import { ProfilesDataTable } from "@/components/profile-data-table";
+import {
+  type PasswordDialogMode,
+  ProfilePasswordDialog,
+} from "@/components/profile-password-dialog";
 import { ProfileSelectorDialog } from "@/components/profile-selector-dialog";
 import { ProfileSyncDialog } from "@/components/profile-sync-dialog";
 import { ProxyAssignmentDialog } from "@/components/proxy-assignment-dialog";
@@ -47,6 +51,7 @@ import { useUpdateNotifications } from "@/hooks/use-update-notifications";
 import { useVersionUpdater } from "@/hooks/use-version-updater";
 import { useVpnEvents } from "@/hooks/use-vpn-events";
 import { useWayfernTerms } from "@/hooks/use-wayfern-terms";
+import { translateBackendError } from "@/lib/backend-errors";
 import {
  dismissToast,
  showErrorToast,
@@ -183,6 +188,11 @@ export default function Home() {
  const [currentProfileForCamoufoxConfig, setCurrentProfileForCamoufoxConfig] =
    useState<BrowserProfile | null>(null);
  const [cloneProfile, setCloneProfile] = useState<BrowserProfile | null>(null);
+  const [passwordDialogProfile, setPasswordDialogProfile] =
+    useState<BrowserProfile | null>(null);
+  const [passwordDialogMode, setPasswordDialogMode] =
+    useState<PasswordDialogMode>("set");
+  const pendingLaunchAfterUnlockRef = useRef<BrowserProfile | null>(null);
  const [hasCheckedStartupPrompt, setHasCheckedStartupPrompt] = useState(false);
  const [launchOnLoginDialogOpen, setLaunchOnLoginDialogOpen] = useState(false);
  const [windowResizeWarningOpen, setWindowResizeWarningOpen] = useState(false);
@@ -532,6 +542,7 @@ export default function Home() {
      ephemeral?: boolean;
      dnsBlocklist?: string;
      launchHook?: string;
+      password?: string;
    }) => {
      try {
        const profile = await invoke<BrowserProfile>(
@@ -565,6 +576,21 @@ export default function Home() {
          }
        }

+        if (profileData.password && !profileData.ephemeral) {
+          try {
+            await invoke("set_profile_password", {
+              profileId: profile.id,
+              password: profileData.password,
+            });
+          } catch (err) {
+            showErrorToast(
+              t("errors.setProfilePasswordFailed", {
+                error: translateBackendError(t, err),
+              }),
+            );
+          }
+        }
+
        // No need to manually reload - useProfileEvents will handle the update
      } catch (error) {
        showErrorToast(
@@ -581,6 +607,23 @@ export default function Home() {
    async (profile: BrowserProfile) => {
      console.log("Starting launch for profile:", profile.name);

+      // Password-protected: must be unlocked before launch
+      if (profile.password_protected) {
+        try {
+          const isLocked = await invoke<boolean>("is_profile_locked", {
+            profileId: profile.id,
+          });
+          if (isLocked) {
+            pendingLaunchAfterUnlockRef.current = profile;
+            setPasswordDialogMode("unlock");
+            setPasswordDialogProfile(profile);
+            return;
+          }
+        } catch (err) {
+          console.error("Failed to check profile lock state:", err);
+        }
+      }
+
      // Show one-time warning about window resizing for fingerprinted browsers
      if (profile.browser === "camoufox" || profile.browser === "wayfern") {
        try {
@@ -623,6 +666,24 @@ export default function Home() {
    setCloneProfile(profile);
  }, []);

+  const handleSetPassword = useCallback((profile: BrowserProfile) => {
+    pendingLaunchAfterUnlockRef.current = null;
+    setPasswordDialogMode("set");
+    setPasswordDialogProfile(profile);
+  }, []);
+
+  const handleChangePassword = useCallback((profile: BrowserProfile) => {
+    pendingLaunchAfterUnlockRef.current = null;
+    setPasswordDialogMode("change");
+    setPasswordDialogProfile(profile);
+  }, []);
+
+  const handleRemovePassword = useCallback((profile: BrowserProfile) => {
+    pendingLaunchAfterUnlockRef.current = null;
+    setPasswordDialogMode("remove");
+    setPasswordDialogProfile(profile);
+  }, []);
+
  const handleDeleteProfile = useCallback(
    async (profile: BrowserProfile) => {
      console.log("Attempting to delete profile:", profile.name);
@@ -1110,6 +1171,9 @@ export default function Home() {
            onLaunchProfile={launchProfile}
            onKillProfile={handleKillProfile}
            onCloneProfile={handleCloneProfile}
+            onSetPassword={handleSetPassword}
+            onChangePassword={handleChangePassword}
+            onRemovePassword={handleRemovePassword}
            onDeleteProfile={handleDeleteProfile}
            onRenameProfile={handleRenameProfile}
            onConfigureCamoufox={handleConfigureCamoufox}
@@ -1215,6 +1279,26 @@ export default function Home() {
        profile={cloneProfile}
      />

+      <ProfilePasswordDialog
+        isOpen={!!passwordDialogProfile}
+        onClose={() => {
+          pendingLaunchAfterUnlockRef.current = null;
+          setPasswordDialogProfile(null);
+        }}
+        profile={passwordDialogProfile}
+        mode={passwordDialogMode}
+        onSuccess={(p) => {
+          if (
+            passwordDialogMode === "unlock" &&
+            pendingLaunchAfterUnlockRef.current?.id === p.id
+          ) {
+            const target = pendingLaunchAfterUnlockRef.current;
+            pendingLaunchAfterUnlockRef.current = null;
+            void launchProfile(target);
+          }
+        }}
+      />
+
      <CamoufoxConfigDialog
        isOpen={camoufoxConfigDialogOpen}
        onClose={() => {
@@ -86,6 +86,7 @@ interface CreateProfileDialogProps {
    ephemeral?: boolean;
    dnsBlocklist?: string;
    launchHook?: string;
+    password?: string;
  }) => Promise<void>;
  selectedGroupId?: string;
  crossOsUnlocked?: boolean;
@@ -170,6 +171,11 @@ export function CreateProfileDialog({
  const [showProxyForm, setShowProxyForm] = useState(false);
  const [isCreating, setIsCreating] = useState(false);
  const [ephemeral, setEphemeral] = useState(false);
+  const [enablePassword, setEnablePassword] = useState(false);
+  const [password, setPassword] = useState("");
+  const [passwordConfirm, setPasswordConfirm] = useState("");
+  const [passwordError, setPasswordError] = useState<string | null>(null);
+  const PASSWORD_MIN_LEN = 8;
  const [selectedExtensionGroupId, setSelectedExtensionGroupId] =
    useState<string>();
  const [extensionGroups, setExtensionGroups] = useState<
@@ -370,12 +376,30 @@ export function CreateProfileDialog({
  const handleCreate = async () => {
    if (!profileName.trim()) return;

+    if (enablePassword && !ephemeral) {
+      if (password.length < PASSWORD_MIN_LEN) {
+        setPasswordError(
+          t("profilePassword.errors.tooShort", { min: PASSWORD_MIN_LEN }),
+        );
+        return;
+      }
+      if (password !== passwordConfirm) {
+        setPasswordError(t("profilePassword.errors.mismatch"));
+        return;
+      }
+    }
+    setPasswordError(null);
+
    setIsCreating(true);

    const isVpnSelection = selectedProxyId?.startsWith("vpn-") ?? false;
    const resolvedProxyId = isVpnSelection ? undefined : selectedProxyId;
    const resolvedVpnId =
      isVpnSelection && selectedProxyId ? selectedProxyId.slice(4) : undefined;
+    const passwordToSet =
+      enablePassword && !ephemeral && password.length >= PASSWORD_MIN_LEN
+        ? password
+        : undefined;
    try {
      if (activeTab === "anti-detect") {
        // Anti-detect browser - check if Wayfern or Camoufox is selected
@@ -403,6 +427,7 @@ export function CreateProfileDialog({
            ephemeral,
            dnsBlocklist: dnsBlocklist || undefined,
            launchHook: launchHook.trim() || undefined,
+            password: passwordToSet,
          });
        } else {
          // Default to Camoufox
@@ -430,6 +455,7 @@ export function CreateProfileDialog({
            ephemeral,
            dnsBlocklist: dnsBlocklist || undefined,
            launchHook: launchHook.trim() || undefined,
+            password: passwordToSet,
          });
        }
      } else {
@@ -455,6 +481,7 @@ export function CreateProfileDialog({
          groupId: selectedGroupId !== "default" ? selectedGroupId : undefined,
          dnsBlocklist: dnsBlocklist || undefined,
          launchHook: launchHook.trim() || undefined,
+          password: passwordToSet,
        });
      }

@@ -488,6 +515,10 @@ export function CreateProfileDialog({
      os: getCurrentOS() as WayfernOS, // Reset to current OS
    });
    setEphemeral(false);
+    setEnablePassword(false);
+    setPassword("");
+    setPasswordConfirm("");
+    setPasswordError(null);
    onClose();
  };

@@ -718,6 +749,68 @@ export function CreateProfileDialog({
                          </p>
                        </div>

+                        {/* Password Option */}
+                        {!ephemeral && (
+                          <div className="space-y-3 p-4 border rounded-lg bg-muted/30">
+                            <div className="flex items-center space-x-2">
+                              <Checkbox
+                                id="enable-password"
+                                checked={enablePassword}
+                                onCheckedChange={(checked) => {
+                                  setEnablePassword(checked === true);
+                                  if (checked !== true) {
+                                    setPassword("");
+                                    setPasswordConfirm("");
+                                    setPasswordError(null);
+                                  }
+                                }}
+                              />
+                              <Label
+                                htmlFor="enable-password"
+                                className="font-medium"
+                              >
+                                {t("createProfile.passwordProtect.label")}
+                              </Label>
+                            </div>
+                            <p className="text-sm text-muted-foreground ml-6">
+                              {t("createProfile.passwordProtect.description")}
+                            </p>
+                            {enablePassword && (
+                              <div className="ml-6 space-y-2">
+                                <Input
+                                  type="password"
+                                  value={password}
+                                  onChange={(e) => {
+                                    setPassword(e.target.value);
+                                    setPasswordError(null);
+                                  }}
+                                  placeholder={t(
+                                    "profilePassword.fields.newPassword",
+                                  )}
+                                  autoComplete="new-password"
+                                />
+                                <Input
+                                  type="password"
+                                  value={passwordConfirm}
+                                  onChange={(e) => {
+                                    setPasswordConfirm(e.target.value);
+                                    setPasswordError(null);
+                                  }}
+                                  placeholder={t(
+                                    "profilePassword.fields.confirm",
+                                  )}
+                                  autoComplete="new-password"
+                                />
+                                {passwordError && (
+                                  <p className="text-sm text-destructive">
+                                    {passwordError}
+                                  </p>
+                                )}
+                              </div>
+                            )}
+                          </div>
+                        )}
+
                        {selectedBrowser === "wayfern" ? (
                          // Wayfern Configuration
                          <div className="space-y-6">
@@ -854,6 +854,9 @@ interface ProfilesDataTableProps {
      }
    | undefined;
  onLaunchWithSync?: (profile: BrowserProfile) => void;
+  onSetPassword?: (profile: BrowserProfile) => void;
+  onChangePassword?: (profile: BrowserProfile) => void;
+  onRemovePassword?: (profile: BrowserProfile) => void;
 }

 export function ProfilesDataTable({
@@ -883,6 +886,9 @@ export function ProfilesDataTable({
  syncUnlocked = false,
  getProfileSyncInfo,
  onLaunchWithSync,
+  onSetPassword,
+  onChangePassword,
+  onRemovePassword,
 }: ProfilesDataTableProps) {
  const { t } = useTranslation();
  const { getTableSorting, updateSorting, isLoaded } = useTableSorting();
@@ -1695,7 +1701,9 @@ export function ProfilesDataTable({
          const meta = table.options.meta as TableMeta;
          const profile = row.original;
          const browser = profile.browser;
-          const IconComponent = getProfileIcon(profile);
+          const IconComponent = profile.password_protected
+            ? LuLock
+            : getProfileIcon(profile);
          const isCrossOs = isCrossOsProfile(profile);

          const isSelected = meta.isProfileSelected(profile.id);
@@ -2732,6 +2740,9 @@ export function ProfilesDataTable({
              }}
              onCloneProfile={onCloneProfile}
              onLaunchWithSync={onLaunchWithSync}
+              onSetPassword={onSetPassword}
+              onChangePassword={onChangePassword}
+              onRemovePassword={onRemovePassword}
              onDeleteProfile={(profile) => {
                setProfileForInfoDialog(null);
                setProfileToDelete(profile);
@@ -13,7 +13,10 @@ import {
  LuFingerprint,
  LuGlobe,
  LuGroup,
+  LuKey,
  LuLink,
+  LuLock,
+  LuLockOpen,
  LuPlus,
  LuPuzzle,
  LuRefreshCw,
@@ -71,6 +74,9 @@ interface ProfileInfoDialogProps {
  onCloneProfile?: (profile: BrowserProfile) => void;
  onDeleteProfile?: (profile: BrowserProfile) => void;
  onLaunchWithSync?: (profile: BrowserProfile) => void;
+  onSetPassword?: (profile: BrowserProfile) => void;
+  onChangePassword?: (profile: BrowserProfile) => void;
+  onRemovePassword?: (profile: BrowserProfile) => void;
  crossOsUnlocked?: boolean;
  isRunning?: boolean;
  isDisabled?: boolean;
@@ -119,6 +125,9 @@ export function ProfileInfoDialog({
  onCloneProfile,
  onDeleteProfile,
  onLaunchWithSync,
+  onSetPassword,
+  onChangePassword,
+  onRemovePassword,
  crossOsUnlocked = false,
  isRunning = false,
  isDisabled = false,
@@ -354,6 +363,40 @@ export function ProfileInfoDialog({
      },
      hidden: !onOpenLaunchHook,
    },
+    {
+      icon: <LuKey className="w-4 h-4" />,
+      label: t("profiles.actions.setPassword"),
+      onClick: () => {
+        handleAction(() => onSetPassword?.(profile));
+      },
+      disabled: isDisabled || isRunning,
+      runningBadge: isRunning,
+      hidden:
+        profile.password_protected === true ||
+        profile.ephemeral === true ||
+        !onSetPassword,
+    },
+    {
+      icon: <LuKey className="w-4 h-4" />,
+      label: t("profiles.actions.changePassword"),
+      onClick: () => {
+        handleAction(() => onChangePassword?.(profile));
+      },
+      disabled: isDisabled || isRunning,
+      runningBadge: isRunning,
+      hidden: profile.password_protected !== true || !onChangePassword,
+    },
+    {
+      icon: <LuLockOpen className="w-4 h-4" />,
+      label: t("profiles.actions.removePassword"),
+      onClick: () => {
+        handleAction(() => onRemovePassword?.(profile));
+      },
+      disabled: isDisabled || isRunning,
+      runningBadge: isRunning,
+      hidden: profile.password_protected !== true || !onRemovePassword,
+      destructive: true,
+    },
    {
      icon: <LuTrash2 className="w-4 h-4" />,
      label: t("profiles.actions.delete"),
@@ -417,6 +460,12 @@ export function ProfileInfoDialog({
                          {t("profiles.ephemeralBadge")}
                        </Badge>
                      )}
+                      {profile.password_protected && (
+                        <Badge variant="outline" className="text-xs gap-1">
+                          <LuLock className="w-3 h-3" />
+                          {t("profiles.passwordProtectedBadge")}
+                        </Badge>
+                      )}
                      {showCrossOs && (
                        <Badge variant="outline" className="text-xs gap-1">
                          <OSIcon
@@ -0,0 +1,302 @@
+"use client";
+
+import { invoke } from "@tauri-apps/api/core";
+import * as React from "react";
+import { useTranslation } from "react-i18next";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import {
+  extractLockoutSeconds,
+  formatLockoutDuration,
+  translateBackendError,
+} from "@/lib/backend-errors";
+import { showErrorToast, showSuccessToast } from "@/lib/toast-utils";
+import type { BrowserProfile } from "@/types";
+import { LoadingButton } from "./loading-button";
+import { RippleButton } from "./ui/ripple";
+
+export type PasswordDialogMode = "set" | "unlock" | "change" | "remove";
+
+interface ProfilePasswordDialogProps {
+  isOpen: boolean;
+  onClose: () => void;
+  profile: BrowserProfile | null;
+  mode: PasswordDialogMode;
+  onSuccess?: (profile: BrowserProfile) => void;
+}
+
+const MIN_LEN = 8;
+
+export function ProfilePasswordDialog({
+  isOpen,
+  onClose,
+  profile,
+  mode,
+  onSuccess,
+}: ProfilePasswordDialogProps) {
+  const { t } = useTranslation();
+  const [oldPassword, setOldPassword] = React.useState("");
+  const [password, setPassword] = React.useState("");
+  const [confirm, setConfirm] = React.useState("");
+  const [isSubmitting, setIsSubmitting] = React.useState(false);
+  const [lockoutSecondsRemaining, setLockoutSecondsRemaining] = React.useState<
+    number | null
+  >(null);
+  const firstInputRef = React.useRef<HTMLInputElement>(null);
+
+  React.useEffect(() => {
+    if (isOpen) {
+      setOldPassword("");
+      setPassword("");
+      setConfirm("");
+      setIsSubmitting(false);
+      setLockoutSecondsRemaining(null);
+      setTimeout(() => firstInputRef.current?.focus(), 0);
+    }
+  }, [isOpen]);
+
+  // Tick down the lockout timer
+  React.useEffect(() => {
+    if (lockoutSecondsRemaining == null) return;
+    if (lockoutSecondsRemaining <= 0) {
+      setLockoutSecondsRemaining(null);
+      return;
+    }
+    const handle = window.setTimeout(() => {
+      setLockoutSecondsRemaining((prev) => (prev == null ? null : prev - 1));
+    }, 1000);
+    return () => {
+      window.clearTimeout(handle);
+    };
+  }, [lockoutSecondsRemaining]);
+
+  if (!profile) return null;
+
+  const needsConfirm = mode === "set" || mode === "change";
+  const needsOldPassword = mode === "change" || mode === "remove";
+
+  const validate = (): string | null => {
+    if (needsOldPassword && !oldPassword) {
+      return t("profilePassword.errors.oldPasswordRequired");
+    }
+    if (mode === "set" || mode === "change") {
+      if (password.length < MIN_LEN) {
+        return t("profilePassword.errors.tooShort", { min: MIN_LEN });
+      }
+      if (password !== confirm) {
+        return t("profilePassword.errors.mismatch");
+      }
+    }
+    if (mode === "unlock" && !password) {
+      return t("profilePassword.errors.passwordRequired");
+    }
+    if (mode === "remove" && !oldPassword) {
+      return t("profilePassword.errors.passwordRequired");
+    }
+    return null;
+  };
+
+  const handleSubmit = async () => {
+    if (isSubmitting || lockoutSecondsRemaining != null) return;
+    const error = validate();
+    if (error) {
+      showErrorToast(error);
+      return;
+    }
+    setIsSubmitting(true);
+    try {
+      switch (mode) {
+        case "set":
+          await invoke("set_profile_password", {
+            profileId: profile.id,
+            password,
+          });
+          showSuccessToast(t("profilePassword.toasts.set"));
+          break;
+        case "unlock":
+          await invoke("unlock_profile", {
+            profileId: profile.id,
+            password,
+          });
+          break;
+        case "change":
+          await invoke("change_profile_password", {
+            profileId: profile.id,
+            oldPassword,
+            newPassword: password,
+          });
+          showSuccessToast(t("profilePassword.toasts.changed"));
+          break;
+        case "remove":
+          await invoke("remove_profile_password", {
+            profileId: profile.id,
+            password: oldPassword,
+          });
+          showSuccessToast(t("profilePassword.toasts.removed"));
+          break;
+      }
+      onSuccess?.(profile);
+      onClose();
+    } catch (err: unknown) {
+      const lockoutSeconds = extractLockoutSeconds(err);
+      if (lockoutSeconds != null) {
+        setLockoutSecondsRemaining(lockoutSeconds);
+      } else {
+        showErrorToast(translateBackendError(t, err));
+      }
+    } finally {
+      setIsSubmitting(false);
+    }
+  };
+
+  const titleKey =
+    mode === "set"
+      ? "profilePassword.set.title"
+      : mode === "unlock"
+        ? "profilePassword.unlock.title"
+        : mode === "change"
+          ? "profilePassword.change.title"
+          : "profilePassword.remove.title";
+
+  const descriptionKey =
+    mode === "set"
+      ? "profilePassword.set.description"
+      : mode === "unlock"
+        ? "profilePassword.unlock.description"
+        : mode === "change"
+          ? "profilePassword.change.description"
+          : "profilePassword.remove.description";
+
+  const submitLabelKey =
+    mode === "set"
+      ? "profilePassword.set.button"
+      : mode === "unlock"
+        ? "profilePassword.unlock.button"
+        : mode === "change"
+          ? "profilePassword.change.button"
+          : "profilePassword.remove.button";
+
+  return (
+    <Dialog
+      open={isOpen}
+      onOpenChange={(open) => {
+        if (!open) onClose();
+      }}
+    >
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>{t(titleKey)}</DialogTitle>
+          <DialogDescription>
+            {t(descriptionKey, { name: profile.name })}
+          </DialogDescription>
+        </DialogHeader>
+        <div className="flex flex-col gap-3">
+          {(mode === "set" || mode === "change") && (
+            <div className="rounded-md border border-warning/50 bg-warning/10 p-3 text-sm">
+              <p className="font-medium text-warning-foreground">
+                {t("profilePassword.warnings.forgetWarningTitle")}
+              </p>
+              <p className="mt-1 text-xs text-muted-foreground">
+                {t("profilePassword.warnings.forgetWarningBody")}
+              </p>
+            </div>
+          )}
+          {lockoutSecondsRemaining != null && (
+            <div className="rounded-md border border-destructive/50 bg-destructive/10 p-3 text-sm text-destructive">
+              {t("backendErrors.lockedOut", {
+                duration: formatLockoutDuration(t, lockoutSecondsRemaining),
+              })}
+            </div>
+          )}
+          {needsOldPassword && (
+            <div className="flex flex-col gap-1.5">
+              <Label htmlFor="profile-pw-old">
+                {mode === "remove"
+                  ? t("profilePassword.fields.password")
+                  : t("profilePassword.fields.currentPassword")}
+              </Label>
+              <Input
+                ref={firstInputRef}
+                id="profile-pw-old"
+                type="password"
+                value={oldPassword}
+                onChange={(e) => setOldPassword(e.target.value)}
+                onKeyDown={(e) => {
+                  if (e.key === "Enter") void handleSubmit();
+                }}
+                disabled={isSubmitting}
+                autoComplete="current-password"
+              />
+            </div>
+          )}
+          {(mode === "set" || mode === "change" || mode === "unlock") && (
+            <div className="flex flex-col gap-1.5">
+              <Label htmlFor="profile-pw-new">
+                {mode === "unlock"
+                  ? t("profilePassword.fields.password")
+                  : t("profilePassword.fields.newPassword")}
+              </Label>
+              <Input
+                ref={!needsOldPassword ? firstInputRef : undefined}
+                id="profile-pw-new"
+                type="password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+                onKeyDown={(e) => {
+                  if (e.key === "Enter") void handleSubmit();
+                }}
+                disabled={isSubmitting}
+                autoComplete={
+                  mode === "unlock" ? "current-password" : "new-password"
+                }
+              />
+            </div>
+          )}
+          {needsConfirm && (
+            <div className="flex flex-col gap-1.5">
+              <Label htmlFor="profile-pw-confirm">
+                {t("profilePassword.fields.confirm")}
+              </Label>
+              <Input
+                id="profile-pw-confirm"
+                type="password"
+                value={confirm}
+                onChange={(e) => setConfirm(e.target.value)}
+                onKeyDown={(e) => {
+                  if (e.key === "Enter") void handleSubmit();
+                }}
+                disabled={isSubmitting}
+                autoComplete="new-password"
+              />
+            </div>
+          )}
+        </div>
+        <DialogFooter>
+          <RippleButton
+            variant="outline"
+            onClick={onClose}
+            disabled={isSubmitting}
+          >
+            {t("common.buttons.cancel")}
+          </RippleButton>
+          <LoadingButton
+            onClick={() => void handleSubmit()}
+            isLoading={isSubmitting}
+            disabled={lockoutSecondsRemaining != null}
+            variant={mode === "remove" ? "destructive" : "default"}
+          >
+            {t(submitLabelKey)}
+          </LoadingButton>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -63,6 +63,7 @@ interface AppSettings {
  api_port: number;
  api_token?: string;
  disable_auto_updates?: boolean;
+  keep_decrypted_profiles_in_ram?: boolean;
 }

 interface CustomThemeState {
@@ -1129,6 +1130,30 @@ export function SettingsDialog({
                </div>
              )}

+              <div className="flex items-start space-x-3 p-3 rounded-lg border">
+                <Checkbox
+                  id="keep-decrypted-profiles-in-ram"
+                  checked={settings.keep_decrypted_profiles_in_ram ?? false}
+                  onCheckedChange={(checked) => {
+                    updateSetting(
+                      "keep_decrypted_profiles_in_ram",
+                      checked as boolean,
+                    );
+                  }}
+                />
+                <div className="space-y-1">
+                  <Label
+                    htmlFor="keep-decrypted-profiles-in-ram"
+                    className="text-sm font-medium"
+                  >
+                    {t("settings.keepDecryptedProfilesInRam")}
+                  </Label>
+                  <p className="text-xs text-muted-foreground">
+                    {t("settings.keepDecryptedProfilesInRamDescription")}
+                  </p>
+                </div>
+              </div>
+
              <LoadingButton
                isLoading={isClearingCache}
                onClick={() => {
@@ -172,7 +172,9 @@
      "clearCacheFailed": "Failed to clear cache"
    },
    "disableAutoUpdates": "Disable App Auto Updates",
-    "disableAutoUpdatesDescription": "Prevent the app from automatically checking and installing Donut Browser updates. Browser updates are not affected."
+    "disableAutoUpdatesDescription": "Prevent the app from automatically checking and installing Donut Browser updates. Browser updates are not affected.",
+    "keepDecryptedProfilesInRam": "Keep Decrypted Profiles In RAM",
+    "keepDecryptedProfilesInRamDescription": "Preserve the decrypted in-RAM copy of password-protected profiles between launches for faster startup. The on-disk copy stays encrypted regardless."
  },
  "header": {
    "searchPlaceholder": "Search profiles...",
@@ -221,7 +223,10 @@
      "assignToGroup": "Assign to Group",
      "changeFingerprint": "Change Fingerprint",
      "copyCookiesToProfile": "Copy Cookies to Profile",
-      "launchHook": "Launch Hook URL"
+      "launchHook": "Launch Hook URL",
+      "setPassword": "Set Password",
+      "changePassword": "Change Password",
+      "removePassword": "Remove Password"
    },
    "synchronizer": {
      "launchWithSync": "Launch with Synchronizer",
@@ -265,7 +270,8 @@
      "assignProxy": "Assign Proxy",
      "assignExtensionGroup": "Assign Extension Group",
      "copyCookies": "Copy Cookies"
-    }
+    },
+    "passwordProtectedBadge": "Password Protected"
  },
  "createProfile": {
    "title": "Create New Profile",
@@ -312,7 +318,11 @@
    "firefoxLabel": "Firefox",
    "firefoxSubtitle": "Powered by Camoufox",
    "camoufoxWarning": "Firefox (Camoufox) is maintained by a third-party organization. For production use, please use Chromium.",
-    "platformUnavailable": "{{browser}} is not available on your platform yet."
+    "platformUnavailable": "{{browser}} is not available on your platform yet.",
+    "passwordProtect": {
+      "label": "Password protect this profile",
+      "description": "Encrypts the on-disk profile data. Required to launch."
+    }
  },
  "deleteDialog": {
    "title": "Delete Profile",
@@ -892,7 +902,8 @@
    "setupProxyListenersFailed": "Failed to setup proxy event listeners: {{error}}",
    "loadVpnConfigsFailed": "Failed to load VPN configs: {{error}}",
    "setupVpnListenersFailed": "Failed to setup VPN event listeners: {{error}}",
-    "themeNotFound": "Tokyo Night theme not found"
+    "themeNotFound": "Tokyo Night theme not found",
+    "setProfilePasswordFailed": "Failed to set profile password: {{error}}"
  },
  "browser": {
    "camoufox": "Camoufox",
@@ -1589,5 +1600,66 @@
      "upToDateDescription": "All browser versions are up to date",
      "updateAllFailed": "Failed to update browser versions"
    }
+  },
+  "profilePassword": {
+    "set": {
+      "title": "Set Profile Password",
+      "description": "Encrypt the on-disk data for {{name}}. You will need this password every time you launch the profile.",
+      "button": "Encrypt Profile"
+    },
+    "unlock": {
+      "title": "Unlock Profile",
+      "description": "Enter the password to unlock {{name}}.",
+      "button": "Unlock"
+    },
+    "change": {
+      "title": "Change Profile Password",
+      "description": "Re-encrypt {{name}} with a new password.",
+      "button": "Change Password"
+    },
+    "remove": {
+      "title": "Remove Profile Password",
+      "description": "Decrypt the on-disk data for {{name}}. The profile will no longer be password protected.",
+      "button": "Remove Password"
+    },
+    "fields": {
+      "password": "Password",
+      "currentPassword": "Current password",
+      "newPassword": "New password",
+      "confirm": "Confirm password"
+    },
+    "errors": {
+      "oldPasswordRequired": "Current password is required",
+      "passwordRequired": "Password is required",
+      "tooShort": "Password must be at least {{min}} characters",
+      "mismatch": "Passwords do not match"
+    },
+    "toasts": {
+      "set": "Profile is now password protected",
+      "changed": "Profile password changed",
+      "removed": "Profile password removed"
+    },
+    "warnings": {
+      "forgetWarningTitle": "Important: this password is not recoverable",
+      "forgetWarningBody": "Donut Browser cannot reset, recover, or bypass this password. If you forget it, you will permanently lose access to this profile's data."
+    }
+  },
+  "backendErrors": {
+    "incorrectPassword": "Incorrect password",
+    "lockedOut": "Too many incorrect attempts. Try again in {{duration}}.",
+    "lockedOutDuration": {
+      "seconds": "{{seconds}}s",
+      "minutes": "{{minutes}} min",
+      "hours": "{{hours}} h"
+    },
+    "profileNotFound": "Profile not found",
+    "profileNotProtected": "Profile is not password protected",
+    "profileAlreadyProtected": "Profile is already password protected",
+    "profileRunning": "Cannot perform this action while the profile is running",
+    "profileMissingSalt": "Profile is missing its encryption salt",
+    "profileLocked": "Profile is locked. Enter the password first.",
+    "invalidProfileId": "Invalid profile id",
+    "passwordTooShort": "Password must be at least {{min}} characters",
+    "internal": "Something went wrong: {{detail}}"
  }
 }
@@ -172,7 +172,9 @@
      "clearCacheFailed": "Error al limpiar la caché"
    },
    "disableAutoUpdates": "Desactivar Actualizaciones Automáticas de la App",
-    "disableAutoUpdatesDescription": "Evita que la aplicación busque e instale actualizaciones de Donut Browser automáticamente. Las actualizaciones de navegadores no se ven afectadas."
+    "disableAutoUpdatesDescription": "Evita que la aplicación busque e instale actualizaciones de Donut Browser automáticamente. Las actualizaciones de navegadores no se ven afectadas.",
+    "keepDecryptedProfilesInRam": "Mantener Perfiles Descifrados en RAM",
+    "keepDecryptedProfilesInRamDescription": "Conservar la copia descifrada en RAM de los perfiles protegidos por contraseña entre lanzamientos para un inicio más rápido. La copia en disco permanece cifrada en cualquier caso."
  },
  "header": {
    "searchPlaceholder": "Buscar perfiles...",
@@ -221,7 +223,10 @@
      "assignToGroup": "Asignar a Grupo",
      "changeFingerprint": "Cambiar Huella Digital",
      "copyCookiesToProfile": "Copiar Cookies al Perfil",
-      "launchHook": "URL del hook de inicio"
+      "launchHook": "URL del hook de inicio",
+      "setPassword": "Establecer Contraseña",
+      "changePassword": "Cambiar Contraseña",
+      "removePassword": "Quitar Contraseña"
    },
    "synchronizer": {
      "launchWithSync": "Lanzar con Sincronizador",
@@ -265,7 +270,8 @@
      "assignProxy": "Asignar proxy",
      "assignExtensionGroup": "Asignar grupo de extensiones",
      "copyCookies": "Copiar cookies"
-    }
+    },
+    "passwordProtectedBadge": "Protegido por Contraseña"
  },
  "createProfile": {
    "title": "Crear Nuevo Perfil",
@@ -312,7 +318,11 @@
    "firefoxLabel": "Firefox",
    "firefoxSubtitle": "Impulsado por Camoufox",
    "camoufoxWarning": "Firefox (Camoufox) está mantenido por una organización de terceros. Para uso en producción, utilice Chromium.",
-    "platformUnavailable": "{{browser}} aún no está disponible en tu plataforma."
+    "platformUnavailable": "{{browser}} aún no está disponible en tu plataforma.",
+    "passwordProtect": {
+      "label": "Proteger este perfil con contraseña",
+      "description": "Cifra los datos del perfil en disco. Necesario para abrirlo."
+    }
  },
  "deleteDialog": {
    "title": "Eliminar Perfil",
@@ -892,7 +902,8 @@
    "setupProxyListenersFailed": "Error al configurar los listeners de eventos de proxies: {{error}}",
    "loadVpnConfigsFailed": "Error al cargar las configuraciones de VPN: {{error}}",
    "setupVpnListenersFailed": "Error al configurar los listeners de eventos de VPN: {{error}}",
-    "themeNotFound": "Tema Tokyo Night no encontrado"
+    "themeNotFound": "Tema Tokyo Night no encontrado",
+    "setProfilePasswordFailed": "Error al establecer la contraseña del perfil: {{error}}"
  },
  "browser": {
    "camoufox": "Camoufox",
@@ -1589,5 +1600,66 @@
      "upToDateDescription": "Todas las versiones del navegador están actualizadas",
      "updateAllFailed": "Error al actualizar las versiones del navegador"
    }
+  },
+  "profilePassword": {
+    "set": {
+      "title": "Establecer Contraseña del Perfil",
+      "description": "Cifra los datos en disco de {{name}}. Necesitarás esta contraseña cada vez que abras el perfil.",
+      "button": "Cifrar Perfil"
+    },
+    "unlock": {
+      "title": "Desbloquear Perfil",
+      "description": "Introduce la contraseña para desbloquear {{name}}.",
+      "button": "Desbloquear"
+    },
+    "change": {
+      "title": "Cambiar Contraseña del Perfil",
+      "description": "Vuelve a cifrar {{name}} con una nueva contraseña.",
+      "button": "Cambiar Contraseña"
+    },
+    "remove": {
+      "title": "Quitar Contraseña del Perfil",
+      "description": "Descifra los datos en disco de {{name}}. El perfil dejará de estar protegido por contraseña.",
+      "button": "Quitar Contraseña"
+    },
+    "fields": {
+      "password": "Contraseña",
+      "currentPassword": "Contraseña actual",
+      "newPassword": "Nueva contraseña",
+      "confirm": "Confirmar contraseña"
+    },
+    "errors": {
+      "oldPasswordRequired": "Se requiere la contraseña actual",
+      "passwordRequired": "Se requiere la contraseña",
+      "tooShort": "La contraseña debe tener al menos {{min}} caracteres",
+      "mismatch": "Las contraseñas no coinciden"
+    },
+    "toasts": {
+      "set": "El perfil ahora está protegido por contraseña",
+      "changed": "Contraseña del perfil cambiada",
+      "removed": "Contraseña del perfil eliminada"
+    },
+    "warnings": {
+      "forgetWarningTitle": "Importante: esta contraseña no se puede recuperar",
+      "forgetWarningBody": "Donut Browser no puede restablecer, recuperar ni omitir esta contraseña. Si la olvidas, perderás permanentemente el acceso a los datos de este perfil."
+    }
+  },
+  "backendErrors": {
+    "incorrectPassword": "Contraseña incorrecta",
+    "lockedOut": "Demasiados intentos incorrectos. Vuelve a intentar en {{duration}}.",
+    "lockedOutDuration": {
+      "seconds": "{{seconds}}s",
+      "minutes": "{{minutes}} min",
+      "hours": "{{hours}} h"
+    },
+    "profileNotFound": "Perfil no encontrado",
+    "profileNotProtected": "El perfil no está protegido por contraseña",
+    "profileAlreadyProtected": "El perfil ya está protegido por contraseña",
+    "profileRunning": "No se puede realizar esta acción mientras el perfil está en ejecución",
+    "profileMissingSalt": "Al perfil le falta su sal de cifrado",
+    "profileLocked": "El perfil está bloqueado. Introduce la contraseña primero.",
+    "invalidProfileId": "ID de perfil no válido",
+    "passwordTooShort": "La contraseña debe tener al menos {{min}} caracteres",
+    "internal": "Algo salió mal: {{detail}}"
  }
 }
@@ -172,7 +172,9 @@
      "clearCacheFailed": "Échec de la suppression du cache"
    },
    "disableAutoUpdates": "Désactiver les mises à jour automatiques de l'app",
-    "disableAutoUpdatesDescription": "Empêche l'application de vérifier et d'installer automatiquement les mises à jour de Donut Browser. Les mises à jour des navigateurs ne sont pas affectées."
+    "disableAutoUpdatesDescription": "Empêche l'application de vérifier et d'installer automatiquement les mises à jour de Donut Browser. Les mises à jour des navigateurs ne sont pas affectées.",
+    "keepDecryptedProfilesInRam": "Conserver les profils déchiffrés en RAM",
+    "keepDecryptedProfilesInRamDescription": "Conserver en RAM la copie déchiffrée des profils protégés par mot de passe entre les lancements pour un démarrage plus rapide. La copie sur disque reste chiffrée dans tous les cas."
  },
  "header": {
    "searchPlaceholder": "Rechercher des profils...",
@@ -221,7 +223,10 @@
      "assignToGroup": "Assigner au Groupe",
      "changeFingerprint": "Changer l'Empreinte",
      "copyCookiesToProfile": "Copier les Cookies vers le Profil",
-      "launchHook": "URL du hook de lancement"
+      "launchHook": "URL du hook de lancement",
+      "setPassword": "Définir un mot de passe",
+      "changePassword": "Changer le mot de passe",
+      "removePassword": "Supprimer le mot de passe"
    },
    "synchronizer": {
      "launchWithSync": "Lancer avec le synchroniseur",
@@ -265,7 +270,8 @@
      "assignProxy": "Assigner un proxy",
      "assignExtensionGroup": "Assigner un groupe d’extensions",
      "copyCookies": "Copier les cookies"
-    }
+    },
+    "passwordProtectedBadge": "Protégé par mot de passe"
  },
  "createProfile": {
    "title": "Créer un nouveau profil",
@@ -312,7 +318,11 @@
    "firefoxLabel": "Firefox",
    "firefoxSubtitle": "Propulsé par Camoufox",
    "camoufoxWarning": "Firefox (Camoufox) est maintenu par une organisation tierce. Pour une utilisation en production, veuillez utiliser Chromium.",
-    "platformUnavailable": "{{browser}} n'est pas encore disponible sur votre plateforme."
+    "platformUnavailable": "{{browser}} n'est pas encore disponible sur votre plateforme.",
+    "passwordProtect": {
+      "label": "Protéger ce profil par mot de passe",
+      "description": "Chiffre les données du profil sur disque. Requis au lancement."
+    }
  },
  "deleteDialog": {
    "title": "Supprimer le profil",
@@ -892,7 +902,8 @@
    "setupProxyListenersFailed": "Échec de la configuration des écouteurs d’événements de proxies : {{error}}",
    "loadVpnConfigsFailed": "Échec du chargement des configurations VPN : {{error}}",
    "setupVpnListenersFailed": "Échec de la configuration des écouteurs d’événements VPN : {{error}}",
-    "themeNotFound": "Thème Tokyo Night introuvable"
+    "themeNotFound": "Thème Tokyo Night introuvable",
+    "setProfilePasswordFailed": "Échec de la définition du mot de passe du profil : {{error}}"
  },
  "browser": {
    "camoufox": "Camoufox",
@@ -1589,5 +1600,66 @@
      "upToDateDescription": "Toutes les versions des navigateurs sont à jour",
      "updateAllFailed": "Échec de la mise à jour des versions des navigateurs"
    }
+  },
+  "profilePassword": {
+    "set": {
+      "title": "Définir un mot de passe de profil",
+      "description": "Chiffre les données sur disque de {{name}}. Vous devrez saisir ce mot de passe à chaque lancement du profil.",
+      "button": "Chiffrer le profil"
+    },
+    "unlock": {
+      "title": "Déverrouiller le profil",
+      "description": "Saisissez le mot de passe pour déverrouiller {{name}}.",
+      "button": "Déverrouiller"
+    },
+    "change": {
+      "title": "Changer le mot de passe du profil",
+      "description": "Re-chiffre {{name}} avec un nouveau mot de passe.",
+      "button": "Changer le mot de passe"
+    },
+    "remove": {
+      "title": "Supprimer le mot de passe du profil",
+      "description": "Déchiffre les données sur disque de {{name}}. Le profil ne sera plus protégé par mot de passe.",
+      "button": "Supprimer le mot de passe"
+    },
+    "fields": {
+      "password": "Mot de passe",
+      "currentPassword": "Mot de passe actuel",
+      "newPassword": "Nouveau mot de passe",
+      "confirm": "Confirmer le mot de passe"
+    },
+    "errors": {
+      "oldPasswordRequired": "Le mot de passe actuel est requis",
+      "passwordRequired": "Le mot de passe est requis",
+      "tooShort": "Le mot de passe doit comporter au moins {{min}} caractères",
+      "mismatch": "Les mots de passe ne correspondent pas"
+    },
+    "toasts": {
+      "set": "Le profil est maintenant protégé par mot de passe",
+      "changed": "Mot de passe du profil modifié",
+      "removed": "Mot de passe du profil supprimé"
+    },
+    "warnings": {
+      "forgetWarningTitle": "Important : ce mot de passe ne peut pas être récupéré",
+      "forgetWarningBody": "Donut Browser ne peut ni réinitialiser, ni récupérer, ni contourner ce mot de passe. Si vous l'oubliez, vous perdrez définitivement l'accès aux données de ce profil."
+    }
+  },
+  "backendErrors": {
+    "incorrectPassword": "Mot de passe incorrect",
+    "lockedOut": "Trop de tentatives incorrectes. Réessayez dans {{duration}}.",
+    "lockedOutDuration": {
+      "seconds": "{{seconds}}s",
+      "minutes": "{{minutes}} min",
+      "hours": "{{hours}} h"
+    },
+    "profileNotFound": "Profil introuvable",
+    "profileNotProtected": "Le profil n'est pas protégé par mot de passe",
+    "profileAlreadyProtected": "Le profil est déjà protégé par mot de passe",
+    "profileRunning": "Impossible d'effectuer cette action pendant que le profil est en cours d'exécution",
+    "profileMissingSalt": "Le sel de chiffrement du profil est manquant",
+    "profileLocked": "Le profil est verrouillé. Entrez d'abord le mot de passe.",
+    "invalidProfileId": "Identifiant de profil non valide",
+    "passwordTooShort": "Le mot de passe doit comporter au moins {{min}} caractères",
+    "internal": "Une erreur s'est produite : {{detail}}"
  }
 }
@@ -172,7 +172,9 @@
      "clearCacheFailed": "キャッシュのクリアに失敗しました"
    },
    "disableAutoUpdates": "アプリの自動更新を無効にする",
-    "disableAutoUpdatesDescription": "Donut Browserの自動更新確認・インストールを無効にします。ブラウザの更新には影響しません。"
+    "disableAutoUpdatesDescription": "Donut Browserの自動更新確認・インストールを無効にします。ブラウザの更新には影響しません。",
+    "keepDecryptedProfilesInRam": "復号済みプロファイルをRAMに保持",
+    "keepDecryptedProfilesInRamDescription": "起動を高速化するため、パスワード保護されたプロファイルの復号済みコピーをRAMに保持します。ディスク上のコピーは常に暗号化されたままです。"
  },
  "header": {
    "searchPlaceholder": "プロファイルを検索...",
@@ -221,7 +223,10 @@
      "assignToGroup": "グループに割り当て",
      "changeFingerprint": "フィンガープリントを変更",
      "copyCookiesToProfile": "Cookieをプロファイルにコピー",
-      "launchHook": "起動フックURL"
+      "launchHook": "起動フックURL",
+      "setPassword": "パスワードを設定",
+      "changePassword": "パスワードを変更",
+      "removePassword": "パスワードを削除"
    },
    "synchronizer": {
      "launchWithSync": "シンクロナイザーで起動",
@@ -265,7 +270,8 @@
      "assignProxy": "プロキシを割り当て",
      "assignExtensionGroup": "拡張機能グループを割り当て",
      "copyCookies": "Cookieをコピー"
-    }
+    },
+    "passwordProtectedBadge": "パスワード保護"
  },
  "createProfile": {
    "title": "新しいプロファイルを作成",
@@ -312,7 +318,11 @@
    "firefoxLabel": "Firefox",
    "firefoxSubtitle": "Camoufox搭載",
    "camoufoxWarning": "Firefox（Camoufox）はサードパーティの組織によって管理されています。本番環境での使用にはChromiumをご利用ください。",
-    "platformUnavailable": "{{browser}} はまだお使いのプラットフォームで利用できません。"
+    "platformUnavailable": "{{browser}} はまだお使いのプラットフォームで利用できません。",
+    "passwordProtect": {
+      "label": "このプロファイルをパスワードで保護",
+      "description": "ディスク上のプロファイルデータを暗号化します。起動に必要です。"
+    }
  },
  "deleteDialog": {
    "title": "プロファイルを削除",
@@ -892,7 +902,8 @@
    "setupProxyListenersFailed": "プロキシイベントリスナーの設定に失敗しました: {{error}}",
    "loadVpnConfigsFailed": "VPN設定の読み込みに失敗しました: {{error}}",
    "setupVpnListenersFailed": "VPNイベントリスナーの設定に失敗しました: {{error}}",
-    "themeNotFound": "Tokyo Night テーマが見つかりません"
+    "themeNotFound": "Tokyo Night テーマが見つかりません",
+    "setProfilePasswordFailed": "プロファイルのパスワード設定に失敗しました: {{error}}"
  },
  "browser": {
    "camoufox": "Camoufox",
@@ -1589,5 +1600,66 @@
      "upToDateDescription": "すべてのブラウザバージョンは最新です",
      "updateAllFailed": "ブラウザバージョンの更新に失敗しました"
    }
+  },
+  "profilePassword": {
+    "set": {
+      "title": "プロファイルにパスワードを設定",
+      "description": "{{name}} のディスク上のデータを暗号化します。プロファイルを起動するたびにこのパスワードが必要になります。",
+      "button": "プロファイルを暗号化"
+    },
+    "unlock": {
+      "title": "プロファイルを解除",
+      "description": "{{name}} を解除するためのパスワードを入力してください。",
+      "button": "解除"
+    },
+    "change": {
+      "title": "プロファイルのパスワードを変更",
+      "description": "新しいパスワードで {{name}} を再暗号化します。",
+      "button": "パスワードを変更"
+    },
+    "remove": {
+      "title": "プロファイルのパスワードを削除",
+      "description": "{{name}} のディスク上のデータを復号します。プロファイルはパスワード保護されなくなります。",
+      "button": "パスワードを削除"
+    },
+    "fields": {
+      "password": "パスワード",
+      "currentPassword": "現在のパスワード",
+      "newPassword": "新しいパスワード",
+      "confirm": "パスワードの確認"
+    },
+    "errors": {
+      "oldPasswordRequired": "現在のパスワードが必要です",
+      "passwordRequired": "パスワードが必要です",
+      "tooShort": "パスワードは {{min}} 文字以上必要です",
+      "mismatch": "パスワードが一致しません"
+    },
+    "toasts": {
+      "set": "プロファイルがパスワードで保護されました",
+      "changed": "プロファイルのパスワードを変更しました",
+      "removed": "プロファイルのパスワードを削除しました"
+    },
+    "warnings": {
+      "forgetWarningTitle": "重要: このパスワードは復元できません",
+      "forgetWarningBody": "Donut Browserはこのパスワードをリセット、復元、回避することはできません。忘れた場合、このプロファイルのデータへのアクセスは永続的に失われます。"
+    }
+  },
+  "backendErrors": {
+    "incorrectPassword": "パスワードが正しくありません",
+    "lockedOut": "失敗回数が多すぎます。{{duration}}後に再試行してください。",
+    "lockedOutDuration": {
+      "seconds": "{{seconds}}秒",
+      "minutes": "{{minutes}}分",
+      "hours": "{{hours}}時間"
+    },
+    "profileNotFound": "プロファイルが見つかりません",
+    "profileNotProtected": "プロファイルはパスワード保護されていません",
+    "profileAlreadyProtected": "プロファイルはすでにパスワード保護されています",
+    "profileRunning": "プロファイルの実行中はこの操作を実行できません",
+    "profileMissingSalt": "プロファイルに暗号化ソルトがありません",
+    "profileLocked": "プロファイルはロックされています。先にパスワードを入力してください。",
+    "invalidProfileId": "無効なプロファイルIDです",
+    "passwordTooShort": "パスワードは {{min}} 文字以上必要です",
+    "internal": "問題が発生しました: {{detail}}"
  }
 }
@@ -172,7 +172,9 @@
      "clearCacheFailed": "Falha ao limpar o cache"
    },
    "disableAutoUpdates": "Desativar Atualizações Automáticas do App",
-    "disableAutoUpdatesDescription": "Impede que o aplicativo verifique e instale atualizações do Donut Browser automaticamente. As atualizações de navegadores não são afetadas."
+    "disableAutoUpdatesDescription": "Impede que o aplicativo verifique e instale atualizações do Donut Browser automaticamente. As atualizações de navegadores não são afetadas.",
+    "keepDecryptedProfilesInRam": "Manter Perfis Descriptografados na RAM",
+    "keepDecryptedProfilesInRamDescription": "Preserva a cópia descriptografada na RAM dos perfis protegidos por senha entre execuções para um início mais rápido. A cópia em disco permanece criptografada em qualquer caso."
  },
  "header": {
    "searchPlaceholder": "Pesquisar perfis...",
@@ -221,7 +223,10 @@
      "assignToGroup": "Atribuir ao Grupo",
      "changeFingerprint": "Alterar Impressão Digital",
      "copyCookiesToProfile": "Copiar Cookies para o Perfil",
-      "launchHook": "URL do hook de inicialização"
+      "launchHook": "URL do hook de inicialização",
+      "setPassword": "Definir Senha",
+      "changePassword": "Alterar Senha",
+      "removePassword": "Remover Senha"
    },
    "synchronizer": {
      "launchWithSync": "Iniciar com Sincronizador",
@@ -265,7 +270,8 @@
      "assignProxy": "Atribuir proxy",
      "assignExtensionGroup": "Atribuir grupo de extensões",
      "copyCookies": "Copiar cookies"
-    }
+    },
+    "passwordProtectedBadge": "Protegido por Senha"
  },
  "createProfile": {
    "title": "Criar Novo Perfil",
@@ -312,7 +318,11 @@
    "firefoxLabel": "Firefox",
    "firefoxSubtitle": "Desenvolvido com Camoufox",
    "camoufoxWarning": "O Firefox (Camoufox) é mantido por uma organização terceira. Para uso em produção, utilize o Chromium.",
-    "platformUnavailable": "{{browser}} ainda não está disponível para sua plataforma."
+    "platformUnavailable": "{{browser}} ainda não está disponível para sua plataforma.",
+    "passwordProtect": {
+      "label": "Proteger este perfil com senha",
+      "description": "Criptografa os dados do perfil em disco. Necessário para iniciar."
+    }
  },
  "deleteDialog": {
    "title": "Excluir Perfil",
@@ -892,7 +902,8 @@
    "setupProxyListenersFailed": "Falha ao configurar os listeners de eventos de proxies: {{error}}",
    "loadVpnConfigsFailed": "Falha ao carregar as configurações de VPN: {{error}}",
    "setupVpnListenersFailed": "Falha ao configurar os listeners de eventos de VPN: {{error}}",
-    "themeNotFound": "Tema Tokyo Night não encontrado"
+    "themeNotFound": "Tema Tokyo Night não encontrado",
+    "setProfilePasswordFailed": "Falha ao definir a senha do perfil: {{error}}"
  },
  "browser": {
    "camoufox": "Camoufox",
@@ -1589,5 +1600,66 @@
      "upToDateDescription": "Todas as versões dos navegadores estão atualizadas",
      "updateAllFailed": "Falha ao atualizar as versões dos navegadores"
    }
+  },
+  "profilePassword": {
+    "set": {
+      "title": "Definir Senha do Perfil",
+      "description": "Criptografa os dados em disco de {{name}}. Você precisará desta senha sempre que abrir o perfil.",
+      "button": "Criptografar Perfil"
+    },
+    "unlock": {
+      "title": "Desbloquear Perfil",
+      "description": "Digite a senha para desbloquear {{name}}.",
+      "button": "Desbloquear"
+    },
+    "change": {
+      "title": "Alterar Senha do Perfil",
+      "description": "Recriptografe {{name}} com uma nova senha.",
+      "button": "Alterar Senha"
+    },
+    "remove": {
+      "title": "Remover Senha do Perfil",
+      "description": "Descriptografa os dados em disco de {{name}}. O perfil deixará de estar protegido por senha.",
+      "button": "Remover Senha"
+    },
+    "fields": {
+      "password": "Senha",
+      "currentPassword": "Senha atual",
+      "newPassword": "Nova senha",
+      "confirm": "Confirmar senha"
+    },
+    "errors": {
+      "oldPasswordRequired": "A senha atual é obrigatória",
+      "passwordRequired": "A senha é obrigatória",
+      "tooShort": "A senha deve ter pelo menos {{min}} caracteres",
+      "mismatch": "As senhas não coincidem"
+    },
+    "toasts": {
+      "set": "O perfil agora está protegido por senha",
+      "changed": "Senha do perfil alterada",
+      "removed": "Senha do perfil removida"
+    },
+    "warnings": {
+      "forgetWarningTitle": "Importante: esta senha não pode ser recuperada",
+      "forgetWarningBody": "O Donut Browser não pode redefinir, recuperar ou contornar esta senha. Se você esquecê-la, perderá permanentemente o acesso aos dados deste perfil."
+    }
+  },
+  "backendErrors": {
+    "incorrectPassword": "Senha incorreta",
+    "lockedOut": "Tentativas incorretas demais. Tente novamente em {{duration}}.",
+    "lockedOutDuration": {
+      "seconds": "{{seconds}}s",
+      "minutes": "{{minutes}} min",
+      "hours": "{{hours}} h"
+    },
+    "profileNotFound": "Perfil não encontrado",
+    "profileNotProtected": "O perfil não está protegido por senha",
+    "profileAlreadyProtected": "O perfil já está protegido por senha",
+    "profileRunning": "Não é possível realizar esta ação enquanto o perfil está em execução",
+    "profileMissingSalt": "O perfil está sem o sal de criptografia",
+    "profileLocked": "O perfil está bloqueado. Digite a senha primeiro.",
+    "invalidProfileId": "ID de perfil inválido",
+    "passwordTooShort": "A senha deve ter pelo menos {{min}} caracteres",
+    "internal": "Algo deu errado: {{detail}}"
  }
 }
@@ -172,7 +172,9 @@
      "clearCacheFailed": "Не удалось очистить кэш"
    },
    "disableAutoUpdates": "Отключить автообновление приложения",
-    "disableAutoUpdatesDescription": "Запретить автоматическую проверку и установку обновлений Donut Browser. Обновления браузеров не затрагиваются."
+    "disableAutoUpdatesDescription": "Запретить автоматическую проверку и установку обновлений Donut Browser. Обновления браузеров не затрагиваются.",
+    "keepDecryptedProfilesInRam": "Хранить расшифрованные профили в ОЗУ",
+    "keepDecryptedProfilesInRamDescription": "Сохранять расшифрованную копию защищённых паролем профилей в ОЗУ между запусками для ускорения старта. Копия на диске в любом случае остаётся зашифрованной."
  },
  "header": {
    "searchPlaceholder": "Поиск профилей...",
@@ -221,7 +223,10 @@
      "assignToGroup": "Назначить группе",
      "changeFingerprint": "Изменить отпечаток",
      "copyCookiesToProfile": "Копировать Cookie в профиль",
-      "launchHook": "URL хука запуска"
+      "launchHook": "URL хука запуска",
+      "setPassword": "Установить пароль",
+      "changePassword": "Изменить пароль",
+      "removePassword": "Удалить пароль"
    },
    "synchronizer": {
      "launchWithSync": "Запустить с синхронизатором",
@@ -265,7 +270,8 @@
      "assignProxy": "Назначить прокси",
      "assignExtensionGroup": "Назначить группу расширений",
      "copyCookies": "Копировать cookies"
-    }
+    },
+    "passwordProtectedBadge": "Защищено паролем"
  },
  "createProfile": {
    "title": "Создать новый профиль",
@@ -312,7 +318,11 @@
    "firefoxLabel": "Firefox",
    "firefoxSubtitle": "На базе Camoufox",
    "camoufoxWarning": "Firefox (Camoufox) поддерживается сторонней организацией. Для промышленного использования используйте Chromium.",
-    "platformUnavailable": "{{browser}} пока недоступен на вашей платформе."
+    "platformUnavailable": "{{browser}} пока недоступен на вашей платформе.",
+    "passwordProtect": {
+      "label": "Защитить этот профиль паролем",
+      "description": "Шифрует данные профиля на диске. Требуется для запуска."
+    }
  },
  "deleteDialog": {
    "title": "Удалить профиль",
@@ -892,7 +902,8 @@
    "setupProxyListenersFailed": "Не удалось настроить слушатели событий прокси: {{error}}",
    "loadVpnConfigsFailed": "Не удалось загрузить конфигурации VPN: {{error}}",
    "setupVpnListenersFailed": "Не удалось настроить слушатели событий VPN: {{error}}",
-    "themeNotFound": "Тема Tokyo Night не найдена"
+    "themeNotFound": "Тема Tokyo Night не найдена",
+    "setProfilePasswordFailed": "Не удалось установить пароль профиля: {{error}}"
  },
  "browser": {
    "camoufox": "Camoufox",
@@ -1589,5 +1600,66 @@
      "upToDateDescription": "Все версии браузеров актуальны",
      "updateAllFailed": "Не удалось обновить версии браузеров"
    }
+  },
+  "profilePassword": {
+    "set": {
+      "title": "Установить пароль профиля",
+      "description": "Шифрует данные {{name}} на диске. Этот пароль потребуется при каждом запуске профиля.",
+      "button": "Зашифровать профиль"
+    },
+    "unlock": {
+      "title": "Разблокировать профиль",
+      "description": "Введите пароль, чтобы разблокировать {{name}}.",
+      "button": "Разблокировать"
+    },
+    "change": {
+      "title": "Изменить пароль профиля",
+      "description": "Перезашифровать {{name}} с новым паролем.",
+      "button": "Изменить пароль"
+    },
+    "remove": {
+      "title": "Удалить пароль профиля",
+      "description": "Расшифровывает данные {{name}} на диске. Профиль больше не будет защищён паролем.",
+      "button": "Удалить пароль"
+    },
+    "fields": {
+      "password": "Пароль",
+      "currentPassword": "Текущий пароль",
+      "newPassword": "Новый пароль",
+      "confirm": "Подтвердите пароль"
+    },
+    "errors": {
+      "oldPasswordRequired": "Требуется текущий пароль",
+      "passwordRequired": "Требуется пароль",
+      "tooShort": "Пароль должен быть не короче {{min}} символов",
+      "mismatch": "Пароли не совпадают"
+    },
+    "toasts": {
+      "set": "Профиль защищён паролем",
+      "changed": "Пароль профиля изменён",
+      "removed": "Пароль профиля удалён"
+    },
+    "warnings": {
+      "forgetWarningTitle": "Важно: пароль восстановить нельзя",
+      "forgetWarningBody": "Donut Browser не может сбросить, восстановить или обойти этот пароль. Если вы его забудете, доступ к данным этого профиля будет утрачен навсегда."
+    }
+  },
+  "backendErrors": {
+    "incorrectPassword": "Неверный пароль",
+    "lockedOut": "Слишком много неудачных попыток. Повторите через {{duration}}.",
+    "lockedOutDuration": {
+      "seconds": "{{seconds}}с",
+      "minutes": "{{minutes}} мин",
+      "hours": "{{hours}} ч"
+    },
+    "profileNotFound": "Профиль не найден",
+    "profileNotProtected": "Профиль не защищён паролем",
+    "profileAlreadyProtected": "Профиль уже защищён паролем",
+    "profileRunning": "Невозможно выполнить это действие, пока профиль запущен",
+    "profileMissingSalt": "У профиля отсутствует соль шифрования",
+    "profileLocked": "Профиль заблокирован. Сначала введите пароль.",
+    "invalidProfileId": "Недействительный идентификатор профиля",
+    "passwordTooShort": "Пароль должен быть не короче {{min}} символов",
+    "internal": "Что-то пошло не так: {{detail}}"
  }
 }
@@ -172,7 +172,9 @@
      "clearCacheFailed": "清除缓存失败"
    },
    "disableAutoUpdates": "禁用应用自动更新",
-    "disableAutoUpdatesDescription": "阻止应用程序自动检查和安装 Donut Browser 更新。浏览器更新不受影响。"
+    "disableAutoUpdatesDescription": "阻止应用程序自动检查和安装 Donut Browser 更新。浏览器更新不受影响。",
+    "keepDecryptedProfilesInRam": "在内存中保留已解密的配置文件",
+    "keepDecryptedProfilesInRamDescription": "在启动之间保留密码保护配置文件的已解密内存副本,以便更快地启动。无论如何磁盘上的副本始终保持加密。"
  },
  "header": {
    "searchPlaceholder": "搜索配置文件...",
@@ -221,7 +223,10 @@
      "assignToGroup": "分配到组",
      "changeFingerprint": "更改指纹",
      "copyCookiesToProfile": "复制 Cookies 到配置文件",
-      "launchHook": "启动钩子 URL"
+      "launchHook": "启动钩子 URL",
+      "setPassword": "设置密码",
+      "changePassword": "更改密码",
+      "removePassword": "移除密码"
    },
    "synchronizer": {
      "launchWithSync": "使用同步器启动",
@@ -265,7 +270,8 @@
      "assignProxy": "分配代理",
      "assignExtensionGroup": "分配扩展分组",
      "copyCookies": "复制 Cookie"
-    }
+    },
+    "passwordProtectedBadge": "密码保护"
  },
  "createProfile": {
    "title": "创建新配置文件",
@@ -312,7 +318,11 @@
    "firefoxLabel": "Firefox",
    "firefoxSubtitle": "由 Camoufox 驱动",
    "camoufoxWarning": "Firefox（Camoufox）由第三方组织维护。在生产环境中，请使用 Chromium。",
-    "platformUnavailable": "{{browser}} 在您的平台上尚不可用。"
+    "platformUnavailable": "{{browser}} 在您的平台上尚不可用。",
+    "passwordProtect": {
+      "label": "为此配置文件设置密码保护",
+      "description": "加密磁盘上的配置文件数据。启动时需要密码。"
+    }
  },
  "deleteDialog": {
    "title": "删除配置文件",
@@ -892,7 +902,8 @@
    "setupProxyListenersFailed": "设置代理事件监听器失败: {{error}}",
    "loadVpnConfigsFailed": "加载 VPN 配置失败: {{error}}",
    "setupVpnListenersFailed": "设置 VPN 事件监听器失败: {{error}}",
-    "themeNotFound": "未找到 Tokyo Night 主题"
+    "themeNotFound": "未找到 Tokyo Night 主题",
+    "setProfilePasswordFailed": "设置配置文件密码失败: {{error}}"
  },
  "browser": {
    "camoufox": "Camoufox",
@@ -1589,5 +1600,66 @@
      "upToDateDescription": "所有浏览器版本都是最新的",
      "updateAllFailed": "更新浏览器版本失败"
    }
+  },
+  "profilePassword": {
+    "set": {
+      "title": "设置配置文件密码",
+      "description": "加密 {{name}} 的磁盘数据。每次启动配置文件时都需要输入此密码。",
+      "button": "加密配置文件"
+    },
+    "unlock": {
+      "title": "解锁配置文件",
+      "description": "输入密码以解锁 {{name}}。",
+      "button": "解锁"
+    },
+    "change": {
+      "title": "更改配置文件密码",
+      "description": "使用新密码重新加密 {{name}}。",
+      "button": "更改密码"
+    },
+    "remove": {
+      "title": "移除配置文件密码",
+      "description": "解密 {{name}} 的磁盘数据。配置文件将不再受密码保护。",
+      "button": "移除密码"
+    },
+    "fields": {
+      "password": "密码",
+      "currentPassword": "当前密码",
+      "newPassword": "新密码",
+      "confirm": "确认密码"
+    },
+    "errors": {
+      "oldPasswordRequired": "需要当前密码",
+      "passwordRequired": "需要密码",
+      "tooShort": "密码至少需要 {{min}} 个字符",
+      "mismatch": "密码不匹配"
+    },
+    "toasts": {
+      "set": "配置文件现在受密码保护",
+      "changed": "配置文件密码已更改",
+      "removed": "配置文件密码已移除"
+    },
+    "warnings": {
+      "forgetWarningTitle": "重要:此密码无法恢复",
+      "forgetWarningBody": "Donut Browser 无法重置、恢复或绕过此密码。如果忘记,您将永久无法访问此配置文件的数据。"
+    }
+  },
+  "backendErrors": {
+    "incorrectPassword": "密码不正确",
+    "lockedOut": "尝试次数过多。请在 {{duration}} 后重试。",
+    "lockedOutDuration": {
+      "seconds": "{{seconds}}秒",
+      "minutes": "{{minutes}} 分钟",
+      "hours": "{{hours}} 小时"
+    },
+    "profileNotFound": "未找到配置文件",
+    "profileNotProtected": "配置文件未受密码保护",
+    "profileAlreadyProtected": "配置文件已受密码保护",
+    "profileRunning": "配置文件运行时无法执行此操作",
+    "profileMissingSalt": "配置文件缺少加密盐",
+    "profileLocked": "配置文件已锁定。请先输入密码。",
+    "invalidProfileId": "配置文件 ID 无效",
+    "passwordTooShort": "密码至少需要 {{min}} 个字符",
+    "internal": "出现问题:{{detail}}"
  }
 }
@@ -0,0 +1,121 @@
+import type { TFunction } from "i18next";
+
+/**
+ * Backend error codes returned from Rust Tauri commands.
+ * Keep this list in sync with the codes used in `src-tauri/src/profile/password.rs`.
+ */
+export type BackendErrorCode =
+  | "INCORRECT_PASSWORD"
+  | "LOCKED_OUT"
+  | "PROFILE_NOT_FOUND"
+  | "PROFILE_NOT_PROTECTED"
+  | "PROFILE_ALREADY_PROTECTED"
+  | "PROFILE_RUNNING"
+  | "PROFILE_MISSING_SALT"
+  | "PROFILE_LOCKED"
+  | "INVALID_PROFILE_ID"
+  | "PASSWORD_TOO_SHORT"
+  | "INTERNAL_ERROR";
+
+export interface BackendError {
+  code: BackendErrorCode;
+  params?: Record<string, string>;
+}
+
+/**
+ * Try to parse a backend error string as a structured `{code, params}` payload.
+ * Returns null if the string isn't structured (e.g. raw error from a command
+ * that doesn't yet emit codes — caller should fall back to showing the raw text).
+ */
+export function parseBackendError(err: unknown): BackendError | null {
+  const message = err instanceof Error ? err.message : String(err);
+  if (!message.startsWith("{")) return null;
+  try {
+    const parsed = JSON.parse(message);
+    if (
+      parsed &&
+      typeof parsed === "object" &&
+      typeof parsed.code === "string"
+    ) {
+      return parsed as BackendError;
+    }
+  } catch {
+    // not JSON
+  }
+  return null;
+}
+
+/**
+ * Translate a backend error to a localized string. Falls back to the raw
+ * message if the error isn't a structured backend error.
+ */
+export function translateBackendError(t: TFunction, err: unknown): string {
+  const parsed = parseBackendError(err);
+  if (!parsed) {
+    return err instanceof Error ? err.message : String(err);
+  }
+  switch (parsed.code) {
+    case "INCORRECT_PASSWORD":
+      return t("backendErrors.incorrectPassword");
+    case "LOCKED_OUT": {
+      const seconds = Number.parseInt(parsed.params?.seconds ?? "0", 10);
+      return t("backendErrors.lockedOut", {
+        duration: formatLockoutDuration(t, seconds),
+      });
+    }
+    case "PROFILE_NOT_FOUND":
+      return t("backendErrors.profileNotFound");
+    case "PROFILE_NOT_PROTECTED":
+      return t("backendErrors.profileNotProtected");
+    case "PROFILE_ALREADY_PROTECTED":
+      return t("backendErrors.profileAlreadyProtected");
+    case "PROFILE_RUNNING":
+      return t("backendErrors.profileRunning");
+    case "PROFILE_MISSING_SALT":
+      return t("backendErrors.profileMissingSalt");
+    case "PROFILE_LOCKED":
+      return t("backendErrors.profileLocked");
+    case "INVALID_PROFILE_ID":
+      return t("backendErrors.invalidProfileId");
+    case "PASSWORD_TOO_SHORT": {
+      const min = Number.parseInt(parsed.params?.min ?? "8", 10);
+      return t("backendErrors.passwordTooShort", { min });
+    }
+    case "INTERNAL_ERROR":
+      return t("backendErrors.internal", {
+        detail: parsed.params?.detail ?? "",
+      });
+    default:
+      return err instanceof Error ? err.message : String(err);
+  }
+}
+
+export function formatLockoutDuration(t: TFunction, seconds: number): string {
+  if (seconds < 60)
+    return t("backendErrors.lockedOutDuration.seconds", { seconds });
+  const minutes = Math.ceil(seconds / 60);
+  if (minutes < 60)
+    return t("backendErrors.lockedOutDuration.minutes", { minutes });
+  const hours = Math.ceil(minutes / 60);
+  return t("backendErrors.lockedOutDuration.hours", { hours });
+}
+
+/**
+ * Extract the lockout countdown in seconds from a backend error, or null.
+ */
+export function extractLockoutSeconds(err: unknown): number | null {
+  const parsed = parseBackendError(err);
+  if (parsed?.code !== "LOCKED_OUT") return null;
+  const secs = Number.parseInt(parsed.params?.seconds ?? "0", 10);
+  return Number.isFinite(secs) && secs > 0 ? secs : null;
+}
+
+/**
+ * True if the error is a known structured backend error code.
+ */
+export function isBackendErrorCode(
+  err: unknown,
+  code: BackendErrorCode,
+): boolean {
+  return parseBackendError(err)?.code === code;
+}
@@ -37,6 +37,7 @@ export interface BrowserProfile {
  created_by_id?: string;
  created_by_email?: string;
  dns_blocklist?: string;
+  password_protected?: boolean;
 }

 export interface Extension {