The Password Authentication Protocol (PAP) provides a simple method for a user to authenticate using a 2-way handshake. PAP only executes this process during the initial link to the authenticating server. With this scheme, an Id/Password pair is repeatedly sent by the user's machine to the authenticating server until authentication is acknowledged or the connection is terminated.
This authentication method is most appropriately used where a plain text password must be available to simulate a login at a remote host. In such use, this method provides a similar level of security to the usual user login at the remote host.
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