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实现安全多播的一般方法是设法让参与多播的所有成员共享一个组密钥 当有组成员离开或组密钥失密时 ,要进行组密钥的更新 当多播组较大时 ,组密钥更新的缩放性和可靠性是一个重要问题 解决缩放性可采用批量密钥更新方法 (BKR) ;解决可靠性可基于报文重传和纠错码等方法 WKA给出了一种对密钥树分层加权解决上述问题 在分析密钥更新需求的基础上 ,基于WKA方法 ,提出了一种在前缀编码的密钥树中 ,实现动态分层式密钥更新的方法 (A WKA) 使用前缀编码可以很方便地计算出密钥树中变化结点位置关系 ,从而为动态分层提供快速、准确的决策依据 仿真分析表明 ,所提出的算法较WKA方法有较大的优势
The general approach to implementing secure multicast is to try to have all the members participating in a multicast share a group key. To update the group key when a group member leaves or the group key is compromised. When the multicast group is large, the group secret The scalability and reliability of the key update is an important issue. Scalability can be achieved using the bulk key update method (BKR); the reliability of the solution can be based on methods such as message retransmission and error correction code. Tree stratified weighting to solve the above problems On the basis of analyzing the key renewal requirements, based on the WKA method, a method of implementing dynamic hierarchical key renewal (A WKA) in prefix key tree is proposed Coding makes it easy to calculate the position relationship of the changed nodes in the key tree so as to provide a fast and accurate decision basis for the dynamic layering. Simulation analysis shows that the proposed algorithm has more advantages than the WKA method