What is authentication protocol?

Authentication Protocol

An authentication protocol is a type of cryptographic protocol with the purpose of authenticating entities wishing to communicate securely.

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Some articles on authentication protocol:

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 ... resort when the remote server does not support a stronger authentication protocol, like CHAP or EAP (the latter is actually a framework) ...
Point-to-point Protocol - Description - Automatic Self Configuration
... Link Control Protocol (LCP) initiates and terminates connections gracefully, allowing hosts to negotiate connection options ... characters, and magic numbers) and for selecting optional authentication ... The LCP protocol runs on top of PPP (with PPP protocol number 0xC021) and therefore a basic PPP connection has to be established before LCP is able to configure it ...
Internet Group Management Protocol With Access Control (IGMP-AC)
... The Internet Group Management Protocol with Access Control (IGMP-AC) has been designed for incorporating AAA protocol functionality in the existing IP multicast model ... It will enforce authentication and authorization of an end user or receiver before joining or leaving a secured multicast group ... IGMP-AC is an extended version of Internet Group Management Protocol ...
Authentication Protocol
... An authentication protocol is a type of cryptographic protocol with the purpose of authenticating entities wishing to communicate securely ... There are many different authentication protocols such as AKA CAVE-based_authentication Challenge-handshake authentication protocol (CHAP) CRAM-MD5 Diameter Extensible Authentication ...
MS-CHAP
... MS-CHAP is the Microsoft version of the Challenge-Handshake Authentication Protocol, CHAP ... The protocol exists in two versions, MS-CHAPv1 (defined in RFC 2433) and MS-CHAPv2 (defined in RFC 2759) ... MS-CHAP is used as one authentication option in Microsoft's implementation of the PPTP protocol for virtual private networks ...