Password authentication protocol

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A password authentication protocol (uncapitalized) is an authentication protocol that uses a password.

PAP is used by Point to Point Protocol to validate users before allowing them access to server resources. Almost all network operating system remote servers support PAP.

PAP transmits unencrypted ASCII passwords over the network and is therefore considered insecure. It is used as a last resort when the remote server does not support a stronger authentication protocol, like CHAP or EAP (while the last is actually a framework).

Working cycle

  • Client sends username and password
  • Server sends authentication-ack (if credentials are OK) or authentication-nak (otherwise)

PAP Packets

Description

PAP packet embedded in a PPP frame. The protocol field has a value of C023 (hex).

See also


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