PAP and CHAP are authentication protocols used mostly on point-to-point links. PAP stands for Password Authentication Protocol and is a legacy protocol that functions in clear text. Although it may be preferred sometimes because of its simplicity, it is not a reliable protocol from a security perspective because it sends passwords in clear text.
PAP works basically the same way as the normal login procedure. The client authenticates by sending a username and a password to the server, which the server compares to its secrets database. This technique is vulnerable to eavesdroppers, who may try to obtain the . . .
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