摘要： 如何有效地进行密钥管理是安全组播的难点。在Wang等人所做工作的基础上，提出了一个新的基于身份的密钥协商方案，分析了子组之间的通信过程，以及组成员动态变化时密钥的更新过程，结果表明该方案满足密钥协商安全性要求，且在降低计算和通信代价方面取得了较好的效果。

关键词: 安全组播, 密钥协商, 基于身份的密码系统, bilinear pairing

Abstract: Efficient key management is a difficult task in secure multicast. This paper proposes a new identity-based key agreement scheme for multicast groups based on the works of Wang et al. The procedures of secret communications between subgroups and updating of group keys with the dynamic change of group members are analyzed. The analysis shows that the scheme satisfies the security requirements of key agreement and is efficient in computation and communication.

Key words: secure multicast, key agreement, identity-based cryptography, bilinear pairing

中图分类号: 

• TP393