WinVault takes security seriously. We employ industry-standard encryption and advanced security measures to protect your data.

The following security enhancements have been implemented in WinVault v2.1:

• Dynamic Parallelism: Automatically adjusts based on CPU core count (1-4 threads)
• Hardware Detection: Detects high-end (8+ cores), mid-range (4-7 cores), and low-end (≤2 cores) systems
• Performance Impact: Reduces hash time by 20-60% on multi-core systems
• Memory Usage: Scales appropriately (32-128 MiB) based on available resources

• Automatic Rotation: Logs are rotated every 24 hours or when exceeding 1000 entries
• Retention Policy: Maximum 30 days of log retention
• Storage Optimization: Prevents IndexedDB bloat and improves application performance
• Rotation Strategy: Time-based and count-based rotation for optimal storage management

• mlock() Implementation: Sensitive memory pages are locked to prevent swap file writes
• Cold Boot Protection: Prevents memory from being written to disk during system shutdown
• Fallback Support: Graceful degradation when native mlock is not available
• SecureString Integration: All sensitive strings automatically use memory locking
• Performance Impact: Minimal (~1-5ms initial overhead, no runtime impact)

• 18 New Test Cases: Extensive memory leak detection tests added
• Test Coverage: 1000+ encryption/decryption operations, SecureString lifecycle, MemoryManager operations
• Stress Testing: Heavy load scenarios with 500+ operations
• Trend Analysis: Memory trend detection and stability validation
• Performance Impact: Tests only run during CI/CD, no runtime impact

With these enhancements, WinVault's security scores have improved:

If you discover a security vulnerability in WinVault, please report it immediately to our security team. We urge you not to disclose the vulnerability publicly until it has been patched.

WinVault is designed with a "Zero-Knowledge" and "Defense-in-Depth" philosophy.

• Algorithm: AES-256-GCM is used for all data encryption.
• Key Derivation: Master password is strengthened using Argon2id (v1.3) running in WebAssembly (WASM).
  • Memory: 32-128 MiB (Adaptive based on hardware)
  • Iterations: 3-4 (Adaptive based on hardware)
  • Parallelism: 1-4 (Adaptive based on CPU cores)
  • Salt Length: 16-32 bytes
  • Hardware Detection: Automatically adjusts parameters based on CPU core count

• HMAC Protection: A unique HMAC-SHA256 key ensures the integrity of the IndexedDB storage, preventing offline tampering.
• SafeStorage (OS-Level): Critical keys (HMAC Integrity Key, Session Keys) are encrypted using Electron's safeStorage API, which leverages the OS-level keychain (DPAPI on Windows, Keychain on macOS).
• Full IndexedDB Encryption: All stored data is encrypted as a single blob to hide data structure and metadata.

• WASM Isolation: Critical cryptographic operations occur within a compiled WASM module.
• Active Anti-Debugging:
  • Heuristic Detection: Uses timing attacks and console proxy monitoring to detect attached debuggers.
  • Panic Mode: Upon detection, the app wipes sensitive memory, disables the console API globally, and locks the interface.
• Main Process Isolation: Sensitive operations are delegated to the Electron Main process where possible to leverage OS-level memory protections.
• Native Memory Page Locking: Sensitive memory pages are locked using mlock() to prevent swap file writes (cold boot attack protection). Implemented with fallback support for environments without native mlock support.
• SecureString Implementation: All sensitive strings are stored in SecureString objects with automatic memory locking and secure destruction.

• Strict CSP: A rigorous Content Security Policy (CSP) is enforced to prevent XSS and unauthorized script execution.
• Dynamic Port Security: The local extension server utilizes dynamic port allocation ("Port Hopping") to prevent port conflicts and reduce predictability.
• Context Isolation: Electron contextIsolation is rigidly enabled to prevent renderer process access to Node.js internals.

• WebAuthn / FIDO2: Full support for hardware security keys (YubiKey, Titan) with cross-platform compatibility.
• Secure Sessions: Sessions are encrypted, strictly timed, and bound to hardware fingerprints.
• Biometrics: Windows Hello and TouchID integration.
• Two-Factor Authentication (TOTP): Built-in authenticator with QR code support.
• 24-Word Recovery Phrase: BIP39-compatible recovery words for account recovery.

• Security Logging: All authentication events, unauthorized access attempts, and integrity failures are logged to an encrypted securityLogger store (IndexedDB).
  • Log Rotation: Automatic rotation of old logs (max 1000 entries, 30 days retention) to prevent storage bloat.
  • Rotation Strategy: Time-based (every 24 hours) and count-based (when exceeding 1000 entries) rotation.
• Brute-Force Protection: Enhanced rate limiting with exponential backoff (e.g., 1 min, 2 min, 4 min...) and device fingerprinting to prevent distributed attacks.
• WASM Integrity: Argon2id hash parameters are strictly enforced to prevent downgrade attacks.
• Auto-Lock: Configurable inactivity timeout with automatic session termination.

• Automatic Clearing: Clipboard is automatically cleared 5 seconds after copying sensitive data.
• Timer Reset: Multiple copy operations reset the timer to prevent premature clearing.
• Secure Clipboard API: Uses AdvancedSecureClipboard for enhanced protection.

• Cryptographic Randomness: Uses crypto.getRandomValues() for true randomness.
• Entropy Validation: Generated passwords meet minimum 64-bit entropy requirement.
• Pattern Prevention: Algorithms prevent predictable or repeating character patterns.

• Offline-First: WinVault works offline by default.
• Localhost Only: Native messaging and extension servers accept connections ONLY from localhost (127.0.0.1).
• No Analytics: No unique identifiers or usage data are sent to external servers.
• Port Hopping: Local servers use dynamic port allocation to resist conflict and analysis.

WinVault maintains a comprehensive test suite with 115+ automated tests covering:

Memory Leak Tests (tests/security/memory-leak.test.ts):

• 1000+ encryption operations memory leak detection
• 1000+ decryption operations memory leak detection
• SecureString creation/destruction memory leak detection
• MemoryManager registration/unregistration memory leak detection
• Auto-cleanup cycle memory leak detection
• MemoryMonitor recording memory leak detection
• Large data objects memory leak detection
• Stress test memory leak detection
• Memory trend analysis and stability tests

All tests are run using Vitest with jsdom environment for realistic browser simulation.

• Use a strong, unique Master Password (minimum 12 characters recommended).
• Enable Two-Factor Authentication (2FA) or WebAuthn.
• Keep your operating system and WinVault updated.
• Store your 24-word recovery phrase in a secure offline location.
• Configure auto-lock timeout based on your security needs.
• Never share your master password or recovery phrase.

WinVault maintains an encrypted audit log of security-relevant events:

• Failed login attempts
• Successful authentications
• Settings changes
• Data export operations
• Integrity verification failures
• Rate limiting triggers

This log helps identify potential security issues and unauthorized access attempts.