![]() The server will then establish the PPP session between the client and server. If the credentials are sent correctly, the server will send an authentication-ack response packet to the client. If the server is listening to authentication requests, it will accept the username and password credentials and verify that they match. This is performed through an authentication-request packet. The client wishing to establish a PPP session with a server sends a username and password combination to the server. Client sends username and password to server. PAP uses a two-way handshake process for authentication using the following steps. Authentication occurs only one time at the beginning of a session establishment process. PAP is a client-server, password-based authentication protocol. It was standardized in 1992 by way of IETF Request for Comments 1334. Of the two Point-to-Point Protocol (PPP) authentication methods, PAP is older. Let's dive deeper into the differences between PAP and CHAP and how they can work together. With this process, CHAP can authenticate in a way that static secret information isn't sent over the wire. This challenge phrase is combined with device hostnames using one-way hash functions. It creates a unique challenge phrase for each authentication by generating a random string. Because the information is static, it is vulnerable to password guessing and snooping.ĬHAP takes a more sophisticated and secure approach to authentication. The password can pass through an established encrypted tunnel for additional security, but PAP is subject to numerous attacks. ![]() The remote system authenticates itself by using a static username and password combination. PAP works like a standard login procedure. ![]()
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