An Improved Conference Key Agreement Protocol

A conference-key protocol is used to establish a common conference key K such that a group of people can communicate securely over a public network. To improve the implementation efficiency of Tzeng¿s conference-key agreement protocol, an efficient conference-key agreement protocol is proposed under the authenticated broadcast channel. First, the improved protocol is round-efficient, and relaxes the waiting time for fault-check. Second, it reduces the computational complexity by revoking the signature procedure in the Tzeng¿s protocol. It is provably secure in the standard model under the DDH assumption.