2、CHAP（Challenge Handshake Authentication Protocol）：CHAP采用挑战-应答（Challenge-Response）的方式来验证用户身份，并不会在网络上直接发送用户的密码，比PAP安全挑战-应答是指客户端用户连接熬VPN服务器时：
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如何抓住机遇迎接挑战是每个企业、或企业的最高管理者必须应答的课题。
How to grasp the opportunity and meet the challenge is an urgent topic that the top managers of the enterprise have to answer.
面对绿蓝悖论的挑战，证伪主义者从定性和定量两方面作了应答。
Confronted with the challenge of the grue paradox, the falsifiabilists answer it both in qualitative way and the quantitative one.
本文定义了一种PPP认证方法，该方法利用随机“挑战”和依据“挑战”和密钥计算出的加密哈希“应答”来完成认证。
This paper defines a PPP authentication methods, the method using random "challenge" and the basis for "challenge" and calculated key encryption Hash "responsive" to complete certification.
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