A New Group Key Exchange Protocol with Stronger Security for Imbalanced Wireless Network

Group Authenticated Key Exchange (GAKE) protocols allow two or more parties to generate a common group session key in public channel. Considering users different computing power, a new GAKE protocol is proposed for imbalanced wireless network and its security is proved in the random oracle model. In additional, the protocol can resist ephemeral key compromise attack and any two users can generate a two-party session key using the information of group stage. Compared with other GAKE protocols for imbalanced wireless network, the proposed protocol has stronger security.