摘要： 针对安全组播中分布式密钥协商算法在密钥更新时计算开销较大、组密钥生成延时较大的问题，利用一些组播组成员之间可信的特点，动态选取组管理者为全组生成组密钥，将集中式密钥分配算法和分布式密钥协商算法相结合，设计一种基于密钥链和密钥树的组密钥管理算法，以降低组密钥生成的计算量，使密钥管理算法具有较高的可扩展性。

关键词: 安全组播, 组密钥管理, 密钥协商, 密钥链, 密钥树结构

Abstract: The efficiency of re-keying is a main factor that influences the performance of secure multicast. This paper presents a new key management algorithm to resolve the problem of high computation cost. The algorithm based on the membership of group is believable and choose a group leader to make a group key for the secure multicast, which introduces the key management algorithm into key agreement algorithm. The algorithm can reduce the computational complexity of group key generation, and improve the scalability of group key management algorithm.

Key words: secure multicast, group key management, key agreement, key chain, key tree structure

中图分类号: 

• TP301.6