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Many applications in distributed computing systems,such as IP telephony, teleconferencing, collaborative workspaces,interactive chats and multi-user games, involve dynamic peergroups. In order to secure communications in dynamic peergroups, group key agreement protocols are needed. In this paper,we come up with a new group key agreement protocol, composedof a basic protocol and a dynamic protocol, for large-scaledynamic peer groups. Our protocols are natural extensions ofone round tripartite Diffie-Hellman key agreement protocol. Inview of it, our protocols are believed to be more efficient thanthose group key agreement protocols built on two-party Diffie-Hellman key agreement protocol. In addition, our protocols havethe properties of group key secrecy, forward and backwardsecrecy, and key independence
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