SecureVault-KMP 🔐

A secure, cross-platform vault application built with Kotlin Multiplatform and Compose Multiplatform. SecureVault provides encrypted storage for sensitive data across Android, iOS, and Desktop platforms.

Features

• 🔒 End-to-End Encryption: All data is encrypted using AES-256-GCM encryption
• 📱 Cross-Platform: Works on Android, iOS, and Desktop (JVM)
• 🛡️ Platform-Specific Security:
  • Android: Uses Android Keystore for secure key storage
  • iOS: Uses iOS Keychain for secure data storage
  • Desktop: Uses PKCS12 keystore with encrypted file storage
• ⚡ Real-time: Coroutine-based async operations

Architecture

SecureVault/
├── composeApp/          # Main application with Compose UI
├── shared/             # Shared business logic and platform implementations
│   ├── commonMain/     # Common interfaces and data classes
│   ├── androidMain/    # Android-specific implementation
│   ├── iosMain/        # iOS-specific implementation
│   └── jvmMain/        # Desktop-specific implementation
└── iosApp/             # iOS app entry point

Security Implementation

Android

• Uses Android Keystore for secure key generation and storage
• AES-256-GCM encryption with random IVs
• Encrypted data stored in SharedPreferences

iOS

• Uses iOS Keychain for secure data storage
• Data accessible only when device is unlocked
• Device-only access (no iCloud sync)

Desktop (JVM)

• PKCS12 keystore for key management
• AES-256-GCM encryption
• Encrypted data stored in local file system
• Configurable password protection

Getting Started

Prerequisites

• Android Studio Hedgehog or later
• JDK 17
• Kotlin 2.2.0+
• For iOS development: Xcode 15+ and macOS

Usage

1. Save Data: Enter a key and value, then tap "Save to Vault"
2. Retrieve Data: Enter a key and tap "Get from Vault"
3. Security: All data is automatically encrypted before storage

Security Considerations

✅ Implemented Security Features

• AES-256-GCM encryption for all data
• Platform-specific secure storage
• Random IVs for each encryption operation
• Secure key generation and storage

⚠️ Security Notes

• Desktop Implementation: Uses hardcoded password "changeit" - should be configurable
• No Biometric Auth: Biometric authentication is planned but not yet implemented
• No Key Rotation: Keys are persistent and not rotated
• Local Storage Only: No cloud sync or backup functionality

🔧 Recommended Security Improvements

1. Make desktop keystore password configurable via environment variables
2. Implement biometric authentication
3. Add key rotation capabilities
4. Add secure backup/restore functionality
5. Implement secure deletion (overwrite data before deletion)
6. Add audit logging for security events

Development

Project Structure

• composeApp/src/commonMain/: Shared UI components
• shared/src/commonMain/: Core vault interface
• shared/src/androidMain/: Android-specific implementation
• shared/src/iosMain/: iOS-specific implementation
• shared/src/jvmMain/: Desktop-specific implementation

License

This project is licensed under the MIT License - see the LICENSE file for details.

⚠️ Important: This is a demonstration project. For production use, please ensure all security recommendations are implemented and thoroughly tested.