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中文摘要：
在对组播密钥更新的典型方案分析的基础上,提出一种M维几何球形组播密钥更新方案,组密钥更新时利用了兄弟节点之间协作产生父节点密钥,从而有效降低组密钥更新的通信开销,同时不增加计算开销和存储开销,并能保证更新时的前向安全性和后向安全性.同时,采用批量更新方案,对大量用户的加入和移出进行优化,有效地降低密钥更新的通信开销,仿真结果证明,本文的方案具有较低的通信量,适用于大型动态组播应用场景.
英文摘要：
Based on analyzing three representative multicast rekeying scheme,such as LKH、OFT and OKD,in this paper,a M-dimensional geometry sphere rekeying scheme for dynamics multicast is put forward. In this new scheme,GC （Group Key Controller） can utilize the cooperation of sibling nodes by one common father,when multicast rekeying,by this way,the communication efficiency is improved,and the computing spending and memory spending isn＇t increased,at the same time forward and backward security is ensured. Based on M-dimensional geometry sphere rekeying scheme,This paper is put forward a batch rekeying scheme,after simulation,we can prove that the communication cost of rekeying is reduced,so this scheme can be used in the scene of large-scale dynamics multicast.
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