中文摘要：

针对效率依赖网络规模的群密钥管理方案在大规模Adhoe网络中非均衡，在更新时延威胁前向安全性这一问题，设计了性能优化的群密钥管理方案，通过跳数对网络分层，层中建立完全子图和星形子图，选择和设计性能相同的常数轮协议协商和管理群密钥，协议复杂度与网络半径相关。理论分析和仿真实验证明该方案更适合大规模Adhoe网络。

英文摘要：

Group key management schemes whose efficiency is based on network scale are not adapted to the large scale Ad hoc networks, and threat the forward security during key updating because the efficiency of group key management is not bal- ance among clusters whose scales are not same. To deal with the problem, this paper designed the performance optimization group key management （POGKM） scheme. It divided the larger scale Ad hoc network into multi clusters by two kinds of topol- ogies including complete sub-graph and star sub-graph, and built multilayer with hop count. To get the same efficiency of group key management in complete sub-graph and star sub-graph constant rounds, it designed and selected group key protocols. The efficiency complexity of POGKM was relatied to the network radius. At last, theory analysis and experimental verification prove POGKM is more appropriate to the large scale Ad hoc network than other schemes, especially Ad hoc networks having short radius and high density.