提出了一种新的安全协商机制用于在SIP实体之间进行安全协议的选择，并给出了相应的安全性分析。
A new negotiation mechanism for the selection of security protocols among SIP entities was put forward, and moreover the corresponding security analysis was provided.
作为网格通信安全的基础，安全认证密钥协商机制是研究的热点问题之一。
As the foundation of Grid communication security, research on the authentication and key agreement mechanism is one of the hot topics.
作为网格通信安全的基础，安全认证密钥协商机制是研究的热点问题之一。
As the foundation of Grid communication security, research on the authentication and key agreement mechanism is one of the hot topics.
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