Password Authentication Protocol

A password authentication protocol (PAP) 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 (the latter is actually a framework).

Password-based authentication is the protocol that two entities share a password in advance and use the password as the basis of authentication. Existing password authentication schemes can be categorized into two types: weak-password authentication schemes and strong-password authentication schemes. In general, strong-password authentication protocols have the advantages over the weak-password authentication schemes in that their computational overhead are lighter, designs are simpler, and implementation are easier, and therefore are especially suitable for some constrained environments.

Read more about Password Authentication ProtocolWorking Cycle, PAP Packets

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Password Authentication Protocol - PAP Packets
... Description 1 byte 1 byte 2 bytes 1 byte Variable 1 byte Variable Authentication-request Code = 1 ID Length Username length Username Password length Password Authentication-ack Code = 2 ID Length Message ... The protocol field has a value of C023 (hex) ... Flag Address Control Protocol (C023 (hex)) Payload (table above) FCS Flag ...