Cryptanalysis and improvement of an elliptic curve Diffie-Hellman key agreement protocol

In SAC´05, Strangio proposed protocol ECKE- 1 as an efficient elliptic curve Diffie-Hellman two-party key agreement protocol using public key authentication. In this letter, we show that protocol ECKE-1 is vulnerable to key-compromise impersonation attacks. We also present an improved protocol - ECKE-1N, which can withstand such attacks. The new protocol´s performance is comparable to the well-known MQV protocol and maintains the same remarkable list of security properties.