基于验证元的口令认证密钥交换协议的最基本安全目标是抵抗字典攻击和服务器泄露攻击。

The fundamental security goal of verifier-based password-authenticated key exchange protocol is security against dictionary attack and server compromise attack.

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本文主要研究基于动态口令认证的密钥交换协议，该协议既能保证VPN的认证安全，又能保证VPN的传输安全。

This paper mainly focuses on key exchange protocol based on dynamic password authentication, which can insure the security of both authentication and transportation of VPN system.

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文章简要回顾了密钥管理的基本内容，指出常见的密钥协定协议的不足，详细介绍了基于口令认证的密钥协定协议。

This paper reviews the basic content of key management, points out the limitation of the existing key agreement protocol and introduces password authenticated key agreement in detail.

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