一种单轮的动态组密钥协商机制

针对动态组密钥协商协议中,轮数大多为2轮,且效率不高的问题,利用ID-based密钥体系下的“免交互两方静态共享秘密”技术,构建了一种单轮信息交互的基于成员认证的组密钥协商协议,并将协议推广到组成员动态变化的情况.它使得密钥协商阶段所需的广播交互消息数目较2轮的协议减少一半,因而通讯效率得以提高.该协议的密钥协商过程是安全的,并且具备“前向”和“后向”安全属性,它能适用于不要求“完美前向安全”的安全组通信应用.

1-round dynamic group key agreement

Among the conventional round group key agreement protocol, the minimal number of message exchange round is 2. The efficiency of the protocol is affected by the number of message exchange round. Using a secret shared technology that two parties share a common static secret without any interaction between them, an efficient one-round ID-based authenticated group key agreement scheme was proposed and extended to the dynamic group. The number of message exchanged during the key agreement in this oneround protocol is reduced to half of that in two-round protocols. So the efficiency of its communication is improved. The proposed scheme was proved to be secure and be forward and backward secure, and can be applied to the secure group communication where the perfect forward secure is not needed.