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The design of a secure and efficient key establishment protocol is one of the toughest challenge in communication protocol design. In the literature many key establishment protocols claimed to be secure against some attacks were later shown to be weak against new attacks. In this work, we have identified a class of weakness named as insider-replay in some existing protocols and proposed a design principle to avoid the weakness. Based on the design principle, we have proposed an efficient key establishment protocol. The proposed protocol is shown to be provably secure under formal security model and averts insider-replay. We have also analyzed the efficiency of the proposed protocol in comparison with existing protocols.

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A growing application area in wireless communications is mobile teleconference. However, wireless communication are more susceptible to eavesdropping and unauthorized access than the wired communication. It is therefore crucial to build secure conference scheme for such communication. In this work, propose a true conference key agreement scheme which addresses some security issues not considered in previous works on conference key schemes. In the proposed protocol, the users can verify the utilization of their share in key construction. Also, the scheme is forward secure, provides mutual authentication and secure dynamic joining and leaving. The protocol is shown to be resistant against replay and impersonation attacks.