PAP (Password Authentication Protocol, used with PPP in which the password is sent to the client as clear text for comparison);
PAP（Password Authentication Protocol，密码验证协议，与 PPP 一起使用，在此机制下，密码以明文形式被发送到客户机进行比较）；
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.
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。
The Security Remote Password protocol is an identity authentication protocol based on verifier, which has the security property with Zero-knowledge password proofs.
远程安全密钥协议基于鉴别符认证技术，具有零知识证明性。
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