Secure authenticated channel

Abstract From the Canadian patent

A protocol (i.e. method) and corresponding apparatuses for calculating a session key. Two peers with knowledge of a common Diffie-Hellman permanent key K perm, and the identity and public key of the other peer. A first peer chooses a first ephemeral private key x and calculates the first corresponding ephemeral public key g x which is sent to the second peer. The second peer calculates a second ephemeral public key g y in the same manner and an ephemeral shared key K eph, hashes g y K eph, K perm, and its identity, and sends g y and the hash to the first peer. The first peer calculates K eph verifies the hash, and hashes g x, K eph K perm, and its identity, and sends it to the second peer …