Encrypted Chat Application
Cross-platform end-to-end encrypted messaging application with AES-256 and RSA key exchange, ensuring zero plaintext data storage.
System Architecture & Overview
A highly secure, cross-platform mobile messaging application engineered with absolute end-to-end encryption (E2EE). The system guarantees that all messages, file transfers, and user metadata are encrypted client-side before ever traversing the network.
In modern messaging, privacy is highly compromised by central servers. This project implements classic cryptographic double-layer encryption, utilizing symmetric AES-256 for high-speed message payloads and asymmetric RSA-2048 for secure key exchanges.
Key Deliverables & Capabilities
- End-to-End Cryptography: Client-side cryptographic processing ensuring zero cleartext storage.
- Secure Key Exchange: Custom key handshake protocol over standard sockets.
- Ephemeral Messaging: Option to self-destruct chat databases from local secure storage.
- OWASP Compliance: Meets and exceeds OWASP Mobile Security verification criteria.
Critical Challenge & Pivot
Managing cryptographic key storage securely on varied mobile OS architectures (Android Keystore vs iOS Keychain) required building uniform native bridges. We resolved this using securely wrapped Flutter Keychain plugins.
System Benchmarks & Outcomes
Passed 100% of standard penetration and leakage tests against a security verification checklist, meeting strict OWASP Mobile Top 10 guidelines with zero data leakage.
Engineering Stack
Provided a single, high-performance codebase compiling natively to iOS and Android.
Implemented in CBC mode with unique IVs for symmetric encryption of message streams.
Utilized for asymmetric encryption during key handshakes and peer identification.