Popularity of group-oriented applications motivates research on security protection for group communications. A number of group key agreement protocols have been proposed for this objective, but most current group key agreement protocols do not consider privacy protection. Group key agreement protocols for networks should also handle dynamic group membership events such as user join and leave events. The Join and Leave Protocols provide backward and forward secrecy respectively. In this paper, we proposed a new anonymous group key agreement protocol based on ID-based encryption cryptosystems. The proposed protocol not only benefits from the desirable features of ID-based cryptosystem, but also provides privacy protection for users. The proposed protocol achieves the following security attribute: anonymity, unlinkability, group key secrecy, group forward secrecy, group backward secrecy, perfect forward secrecy for the group session key and entity authentication.
A three round authenticated group key agreement protocol for ad hoc networks