该机制能实现双向身份认证和密钥协商功能，使SIP认证和加密更为灵活。

This mechanism provides the functions of bidirectional identity authentication and key negotiation, and makes SIP authentication and Encryption more flexible.

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验证结果说明，EAP - AKA协议能够满足对等端和EAP服务器间的双向身份认证。

Finally, the verification result shows that the EAP-AKA protocol can satisfy the mutual authentication between the peer and the EAP server.

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在SIP安全措施上，对传统的HTTP摘要认证方式作了改进，实现了双向身份认证和密钥协商的功能。

In SIP's security measure, the method of the traditional HTTP digest authentication is improved, and the functions of bidirectional identity authentication and key negotiation are supplied.

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