A Dynamic Authenticated Group Key Agreement Scheme
一种动态的可认证的群密钥协商方案

In order to make group key agreement protocol to resist against active attacks, an effective authenticated scheme is presented. The scheme is based on an authenticated two-party key agreement protocol. First, an unauthenticated version of the protocol is presented. Then two-party authenticated version, one-party authenticated version and unauthenticated version are combined using binary key tree. The new scheme provides implicit key authentication and perfect forward secrecy etc, Its com- municational cost is constant and its computational cost is in direct ratio to the logarithm of the number of group members.