关键词: 多播 密钥管理 LKH树 批密钥更新 优化

Abstract:

The logical key hierarchy （LKH） scheme is the most efficient protocol for key management in the field of multicast at present. However, the modes of centralized access control and key distribution limit the extension of their group sizes. In this paper, according to the studies of [1,2] about the behaviors of multicast group members in the MBone,and the ideas of batch processing and optimization control, an optimized batch re-keying scheme and its    algorithm are designed. This scheme overcomes the demerits of the existing protocols and improves the scalability of the group size, and therefore appli  es to large and dynamic multieast groups.

Key words: （multicast, key management, LKH tree, batch re-keying optimization）