在密钥管理中，采用公钥证书来管理和分配密钥。

At last I adopt public key certificate to manage and distribute the public key.

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详细分析了UMTS认证和密钥分配协议的过程以及协议的安全性，找出协议中存在的弱点和可能的攻击，提出了公钥加密协议的改进方法。

This paper analyzes authentication and key distribution protocol of the procedure and security of UMTS. The vulnerability and possible attack to this protocol are described.

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在认证机制中引入公钥密码体制，提出了一个基于公钥密码体制的3g认证与密钥分配协议。

By introducing public key cryptosystem to the authentication mechanism, the author proposed a 3g authentications and key agreement protocol based on public key cryptosystem.

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