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protocol analysis


The following Key Exchange Algorithm (KEA) was designed by the NSA of the US government. It is a variant of the Diffie-Hellman protocol. Each user P has a private key xP and public key g^xP mod p. 1: A → B: g^rA mod p 2: B → A: g^rB mod p Shared Key K = g ^ rAxB + g ^ rBxA mod p Does the KEA protocol provide the following security properties? Please justify your answer. a) Key freshness b) Key Authentication c) Perfect Forward Secrecy Attachments