安全组播中一种有效的密钥更新方案

组密钥管理作为安全组播的核心问题之一，已成为近年来研究的热点。该文在分析了已有组密钥管理方案的基础上，针对一对多的通信方式提出了一种有效的密钥管理方案，该方案在有成员变动时，与以往的密钥管理方案相比，大大降低了计算量及通信量，对时延敏感的多播应用来讲，具有非常重要的实用价值。

Efficient Scheme of Key Update in Secure Multicast

As one of the key problem of secure multicast, group key management has become the research hotspot in recent years. This paper proposes an efficient scheme for the secure one-to-many multicast based on some current group key management schemes. Compared with the previous schemes, the proposed scheme has much lower communication overhead and less computation, with great value for many multicast applications which are sensitive to time delay.