This paper proposes an efficient hybrid multicast key management scheme to solve the problem of high key update cost in large dynamic multicast group. This scheme constructs a hierarchical and grouped key tree and adopts the RSA encryption algorithm, which increases the extensibility and safety. And batch key update is used for more multicast member changes in order to reduce the burden of Grid Security Infrastructure(GSI). The result shows that its storage cost, communication cost and calculation cost are significantly better than the previous schemes, it improves key update efficiency.%针对大型动态群组组播通信密钥更新开销大的问题,提出一种高效的混合组播密钥管理方案.结合SKDC、LKH和Iolus的优点,构造分层分组式结构密钥树,采用RSA算法进行密钥加密传输,提高可扩展性和安全性.在多个成员变动情况下采取批量密钥更新,降低子组控制器的负担.实验结果表明,该方案在存储开销、通信开销和计算开销方面优于传统方案,可提高密钥更新效率.
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