# IsaacSecureMessenger

**Category:** Software & Apps · **Status:** Done

E2E encrypted messaging - X3DH + AES-256-GCM.

**Stack / Tools:** macOS, Encryption, AES-256, PyObjC

**Build path:**
- V1 — Browser chat. Manual key exchange.
- V2 — Native app: QR code pairing.
- V3 — X3DH protocol. Production grade.

**Location:** `~/projects/IsaacSecureMessenger/`

E2E encrypted messenger. X3DH key agreement (identity + signed prekeys + one-time prekeys) + AES-256-GCM for messages. PyObjC native .app; QR-code pairing for key exchange.