Contributory Group Key Agreement in Dynamic SettingContributory Group Key Agreement • March 4th, 2010
Security of many cryptographic protocols hinges on efficient key management mechanism. Many applications in Dynamic Peer Group are becoming increasing popular nowadays. In these group-oriented applications, it is important to establish the group key securely and efficiently. The members in Dynamic Peer Group are symmetrical and dynamic, so the contributory key agreement is more appropriate. In this paper an efficient and authenticated key agreement scheme has been proposed in the Dynamic Peer Group. In this scheme, the members in the Dynamic Peer Group are divided into several clusters according to Linker Cluster Architecture. In each cluster, the members perform the BD protocol to establish the cluster key and the TGDH protocol to generate the group key among the clusters. This method can not only avoid the weakness of AKA (Auxiliary Key Agreement) of BD, but also reduce the computation cost of TGDH scheme. In this scheme the members have been authenticated by an ID-based signature.
