关键词: 多播安全, 无线网络, 密钥管理, 密钥分配, 密钥树

Abstract: In the wireless environment, we need to allocate a group key for everyone in the group in some kinds of service. An excellent key management schemes can efficiently reduce the communication burden, improve the system performance .In this paper , we analyze the state and the problem of existing key management schemes ,then propose a Logical Key Tree scheme based on physic topology .we design the scheme and evaluate the performance .Simulation results show that this scheme can reduce communication burden efficiently.

Key words: Key tree, Rekey, Multicast security, Wireless network, Key management