chronogrid/docs/ARCHITECTURE/02-security-and-crypto.md

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# Security & Cryptography Specification
- **Master Key Derivation**: Argon2id (Memory: 64MB, Iterations: 3, Parallelism: 4).
- **Platform KeyStore Integration**:
- Windows: DPAPI / Credential Manager
- Linux: Freedesktop SecretService API
- Android: Hardware-backed Android KeyStore / TEE
- **Database Cipher**: SQLCipher 4.x (AES-256-CBC with HMAC-SHA512).
- **Transport Security**: Noise XK protocol handshake over QUIC/UDP.