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PAP uses a two-way authentication process where the username and password is sent followed by a response message indicating successful or failed authentication. CHAP, however, is much more paranoid about its authentication. It performs a three-way authentication process, which takes place not only at the beginning of a connection, but also every two minutes. As if that wasn't paranoid enough, CHAP never sends the password across the link. Instead, an MD5 hash is used to mask the password.
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Posted by sagitraz
There are two types of authentications you can use with PPP:
• Password Authentication Protocol (PAP)
• Challenge Handshake Authentication Protocol (CHAP)
PAP uses a two-way authentication process where the username and password is sent followed by a response message indicating successful or failed authentication. CHAP, however, is much more paranoid about its authentication. It performs a three-way authentication process, which takes place not only at the beginning of a connection, but also every two minutes. As if that wasn't paranoid enough, CHAP never sends the password across the link. Instead, an MD5 hash is used to mask the password.
Posted by lijojhon
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