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A recently proposed authenticated key agreement protocol is shown to beinsecure. In particular, one of the two parties is not authenticated, allowingan active man in the middle opponent to replay old messages. The protocol isessentially an authenticated Diffie-Hellman key agreement scheme, and the lackof authentication allows an attacker to replay old messages and have themaccepted. Moreover, if the ephemeral key used to compute a protocol message isever compromised, then the key established using the replayed message will alsobe compromised. Fixing the problem is simple - there are many provably secureand standardised protocols which are just as efficient as the flawed scheme.

The Saeed-Liu-Tian-Gao-Li authenticated key agreement protocol is insecure