中文摘要：

提出一个动态对等网中的2轮密钥协商协议，并证明此协议抗被动攻击，满足完全前向安全性和密钥独立性．协议由ElGamal加密和签名算法组合而成，简单而且有效．此外，协议基于广播信道，所以也适用于无线网络（尤其是ad-hoc）中的群成员协商会话密钥．

英文摘要：

A two rounds key agreement protocol for DPG is proposed. It is secure against passive attack, and both Perfect Forward Secrecy and Key Independence are achieved. The protocol is efficient and simple, and is obtained by combining the ElGamal encryption scheme with ElGamal signature scheme. Based on broadcast channel, it is also fit for key agreement in wireless communication （especially ad-hoc network）.