摘要： 大型动态群组通信对组播密钥更新的安全性需求较高，且目前多数组播密钥更新协议开销较大。针对上述问题，提出一种正交向量简易生成算法，并基于该算法设计一种新的组播密钥管理方案。对群组成员以逻辑子组的形式进行管理，同时通过各自分段正交辅钥更新实时组密钥。当有成员变更时，密钥服务器仅需发送极少数的消息即可完成组密钥的同步。分析结果表明，与LKH和OFT方案相比，该方案的计算负载较低，组员端存储开销较小。

关键词: 组播安全, 正交向量, 密钥管理, 密钥更新, 子组, 辅钥

Abstract: According to the high security requirements of large dynamic multicast group to update group key and problems of large key update overhead in most multicast rekeying protocols, this paper designs a simple orthogonal vectors generating algorithm, and proposes a novel scheme of multicast key management scheme. In the scheme, members are divided into logically subgroups and update real-time key via their sectionalized orthogonal auxiliary keys. When members change, key sever multicasts tiny messages to update key synchronously. Analysis result shows that the proposed scheme has less computation cost and storage cost of members compared with LKH and OFT scheme.

Key words: multicast security, orthogonal vector, key management, key update, subgroup, auxiliary key

中图分类号: 

• TP309