摘要： 针对动态安全组播中设计高效密钥协商方案的难点，该文提出了一个应用门限秘密共享体制的动态安全组播密钥协商方案，分析了各个子组和整个大的组播组的密钥协商过程，以及组成员动态变化时密钥的更新过程。结果表明，该方案在降低组成员计算代价方面取得了较好的效果，且满足密钥协商的安全要求。

关键词: 安全组播, 密钥协商, 秘密共享, 门限方案

Abstract: Designing key management is a difficult task in dynamic secure multicast. This paper proposes a novel key agreement scheme for dynamic secure multicast based on threshold secret sharing. Then the procedures of key agreement of every subgroup and the entire multicast group and updating of group keys with the dynamic change of group members are analyzed in detail. The analysis shows that the scheme is efficient in computation of group members and satisfies the security requirements of key agreement.

Key words: secure multicast, key agreement, secret sharing, threshold scheme

中图分类号: 

• TP393