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