Abstract: This paper presents a new group key management scheme, which is based on keys tree, xor operations and one-way function chains. It provides backward and forward security: Newly admitted group members cannot read previous messages and evicted members cannot read future messages, even with collusion by arbitrarily many evicted members. As far as transmission, computation and storage costs are concerned, the new scheme presented in this paper is better than other existing schemes, which are based on keys tree.

Key words: Secure group communication, Group key management, Keys tree

摘要： 给出了一种新的组密钥管理方案，该方案是基于密钥树、异或运算以及单向函数链，能保证前向以及后向安全性：新加入的组成员不能获得以前的组播报文，而且即使任意多个退出组播组的组成员进行合谋也不能获得以后的组播报文。就通信、计算以及存储开销而言，该方案比现有其他基于密钥树的方案有所提高。

关键词: 安全组播通信, 组密钥管理, 密钥树

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