The original title is "XChaCha20-Poly1305 in a Mesh Network: A Practical Deep Dive"

Short summary

GhostWire uses XChaCha20-Poly1305 for mesh network encryption because it is constant-time, fast in software without AES-NI, and its 192-bit nonce supports millions of messages per key without collision risk. A Double Ratchet pattern provides forward and future secrecy, while hybrid X25519 plus ML-KEM-768 key exchange adds quantum resistance. The post includes Rust code for encryption, ratcheting, and hybrid shared secret derivation.

• •XChaCha20-Poly1305 chosen over AES for constant-time safety and software speed on devices without AES-NI
• •192-bit random nonces prevent collision across millions of out-of-order mesh messages
• •Double Ratchet provides forward secrecy; hybrid X25519+ML-KEM-768 key exchange adds post-quantum resistance

Generated with AI, which can make mistakes.