提出了在V PN多节点情况下会话密钥的分发策略，以及V PN节点加入与离开时会话密钥的改变体制。该体制利用端对端的“自证明”认证协议进行共享密钥分发，会话密钥的分发、V PN节点加入与离开时会话密钥的改变采用计算量小的对称加密算法，所以该体制具有安全、高效的特点。%This paper proposes a system for keys distribution in VPN which has multiple nodes .The sharing key distribu-tion of the system is based on point-to-point self-certifying protocol .The session key distribution and changes of session key when users join or leave depend on symmetrical cryptosystem which computing cost is lower .The system is efficient and secure .
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