Private Password Locker App

Secure Password Vault Pro is a powerful offline password manager designed to securely store and organize your login credentials and sensitive information on your iPhone. It uses strong AES-GCM encryption with keys derived from your master password using PBKDF2 (HMAC-SHA256) to keep your vault safe and private. Your master password is never uploaded or stored outside your device, ensuring full control and privacy.

Key Features:

- Store login items with title, username, password, URL, and notes.
- Search across all fields including title, username, URL, and notes for quick access.
- Fast add, edit, and delete flows using intuitive forms.
- Detail view supports copying username, password, or URL to clipboard with automatic clipboard clearing after a configurable timeout (10–120 seconds) for added security.
- Built-in password generator with customizable length (8–64 characters) and character sets including lowercase, uppercase, digits, and symbols.
- Password strength meter to help you create strong, secure passwords.
- Backup and restore your vault using encrypted export/import files. Backup files remain encrypted and require your master password to restore.

Pro Features (available via lifetime unlock):

- Biometric unlock using Face ID or Touch ID stores your master password securely in the device Keychain protected by biometrics, allowing quick and secure access.
- Two-factor authentication (2FA) support with TOTP codes generated on-device from Base32 secrets stored per entry, enabling easy code copying.
- Organize entries with folders for lightweight, flexible categorization.
- Mark entries as favorites and filter your vault to quickly access important items.
- Change your master password anytime; the vault is re-encrypted on-device, and biometric unlock remains functional.

Security and Privacy:

- The vault is encrypted locally with no network calls or cloud sync, ensuring your data never leaves your device.
- Master password verification uses a Keychain-stored verifier to distinguish between wrong password and empty vault states.
- Auto-lock option locks the vault when the app becomes inactive or backgrounded.
- Clipboard auto-clear feature removes sensitive copied data after a configurable timeout, only if unchanged.

User Experience:

- Easy setup with master password creation on first launch.
- Clear and intuitive interface built with modern fo