Last Updated: July 31, 2026

1. Introduction

SudoVault (hereinafter referred to as "the App") values your privacy. This Privacy Policy explains how the App collects, uses, and protects your personal information. Please read this policy carefully.

2. Information Collection and Storage

2.1 Local Storage

All data in this App is stored locally on your device and is not uploaded to any server or cloud service. This includes but is not limited to:

• Sudoku game progress (levels, records, best times)
• Private space content (photos, videos, files, contacts)
• App settings (password, appearance, entrance configuration, etc.)

Data is stored in the iOS application sandbox (Documents directory) and system Keychain, protected by iOS Data Protection and sandbox isolation.

2.2 Passwords and Security

• Password: Your private space password and destruct password are stored as SHA-256 hashes in the system Keychain. The App cannot access your plaintext password.
• Biometrics: Face ID / Touch ID authentication is handled by the iOS system. The App does not access or store your biometric data.

2.3 Camera Usage

• The intrusion detection feature uses the front camera for silent capture (no shutter sound), triggered only when conditions are met.
• Captured photos are stored only in your device's private space directory and are not uploaded to any server.
• Camera permission can be revoked at any time in system settings.

2.4 Contacts Access