中文摘要：

在无线网络中，多播组成员的变化是劝态的，在某些特殊应用中，成员可能会在一段时间段内频繁地加入和离开，此时有线网络中的传统组播密钥管理方法就会体现出不足。针对此不足，提出一种适应于无线网络的组播密钥管理方案。该方案根据地理位置将组播成员划分为不同子组，每个子组根据本子组成员的变化情况来设置密钥更新间隔TTR和请求数的阀值RT。通过子组管理员来协调本子组与其他成员通信保持一致，提高通信效率、降低异步问题。理论分析和仿真结果表明：该方案在保证组播成员安全通信的基础上，显著地降低无线网络中的组播应用因密钥更新导致的通信开销，从而提高密钥更新效率，使无线网络在处理大流量等应用问题的同时，也具有较高的安全性。

英文摘要：

In the wireless network, the members＇ change in the multicast group is dynamic. When the members join and leave in a period frequently, the traditional multicast key management method in the cable network will show inadequate in some special applications. For this shortage, a kind of multicast key management scheme which is adapted to wireless network is proposed. In the scheme, the multicast members will be divided into different subgroups according to the geographical location and each subgroups set the key update interval TTR and the number of requests threshold ET according to the changes of the book group. This scheme can improve the communication efficiency and reduce the asynchronous problem through the subgroups administrator coordinates multicast communication between the book group and other members. The analysis and simulation results show that the scheme not only can ensure secure communication in multicast member, but also can reduce the communication overhead caused by the key update and improve the efficiency of key update. Thereby, wireless network can handle heavy traffic application problem, at the same time can have higher security.