群密钥协商协议是在Ad Hoc网络群通信中建立会话密钥的一种有效解决方法。但由于Ad Hoc网络是一个拓扑结构变化频繁的网络,因而在群通信中,不仅要建立一致的会话密钥,还要考虑成员变化的情况。文中结合完全二叉树结构,提出了一种新的基于身份的群密钥协商协议。新方案具有隐含密钥认证、已知会话密钥安全、前向安全、抗密钥泄露攻击、抗未知密钥共享攻击、密钥控制等安全特性,并且效率较高。 The group key agreement protocol is an effective solution to establish the session key in Ad Hoc network group communication. However, since Ad Hoc network is a network with frequent changes in topology, it is not only necessary to establish a consistent session key in group communication, but also to consider changes in membership. In this paper, based on the complete binary tree structure, a new identity-based group key agreement protocol is proposed. The new scheme has the characteristics of implicit key authentication, known session key security, forward security, anti-key compromise, anti-unknown key sharing attack, key control and other security features, and is more efficient.