1 year ago

Presented by Jason A Donenfeld FOSDEM 2017


The Key Exchange

The Key Exchange Initiator Responder Handshake Initiation Message Handshake Response Message Both Sides Calculate Symmetric Session Keys Transport Data Transport Data

The Key Exchange ▪ In order for two peers to exchange data, they must first derive ephemeral symmetric crypto session keys from their static public keys. ▪ The key exchange is particularly well designed to keep our principles of solid crypto, static allocations, guarded state, fixed length headers, and stealthiness. ▪ One peer is an initiator of the exchange, and the other peer is the responder. ▪ Initiator and responder can swap roles at any time. ▪ 1-RTT ▪ Either side can reinitiate the handshake to derive new session keys. ▪ Invalid handshake messages are ignored, keeping our stealth principle.

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