Key Agreement for Large-Scale Dynamic Peer Group

Abstract

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