About This Architecture

Cryptographic ratchet protocol state flow orchestrates identity registration, hybrid key establishment, iterative symmetric ratcheting, and post-compromise asymmetric key rotation. Participants register on-chain, derive a root key via ephemeral exchange, then advance message keys through symmetric ratchet loops while monitoring for compromise triggers. When asymmetric ratchet is activated, new Diffie-Hellman key pairs generate fresh root keys, restoring forward secrecy after potential key exposure. This architecture demonstrates how modern messaging systems like Signal achieve per-message key derivation and post-compromise recovery. Fork and customize this diagram to model your protocol's state transitions, add retry logic details, or integrate with your threat model documentation. The design balances computational efficiency of symmetric ratcheting with the security guarantees of periodic asymmetric key refresh.

People also ask

How does a cryptographic ratchet protocol maintain forward secrecy through symmetric and asymmetric key rotation?

A cryptographic ratchet protocol uses symmetric ratcheting to derive new message keys for each communication round, while periodic asymmetric ratcheting with Diffie-Hellman key pairs generates fresh root keys to recover from potential compromise. This diagram shows the four-phase state flow: identity registration on-chain, hybrid session establishment deriving the initial root key, iterative symme