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What is the full form of CHAP?

Full form of CHAP: Here, we are going to learn what does CHAP stands for? CHAP – which is an abbreviation of "Challenge-Handshake Authentication Protocol" in Computer Acronyms/Abbreviations, etc.
Submitted by Anushree Goswami, on August 07, 2020

CHAP: Challenge-Handshake Authentication Protocol

CHAP is an abbreviation of the "Challenge-Handshake Authentication Protocol". It is an identity verification protocol used by Point-to-Point Protocol (PPP) servers, which process by authenticating a user to a network entity in the field of computing. It is mainly used for security purposes, which in contrast to Password Authentication Protocol (PAP) provides much satisfactory and efficient security.

Working of CHAP

• CHAP operates by using a three-way handshake once in a while to verify the identity of the user.
• Point-to-Point Protocol (PPP) servers used this authentication protocol, at the time of setting up the primary Link Control Protocol (LCP), which sends out LCP packets to verify the standards of the resulting data transmission and subsequent to that the process of verification of user client through three-way handshake may happen again at any time.
• The process of verification of CHAP is based on a shared secret, which happens between the access-requesting side and the identity authenticator.
• Subsequent to the setting up duration of the Link Control Protocol, a "challenge" message is sent by the side of the authenticator to the access-requesting side.
• By using a "one-way hash" function on the data of the "challenge" message with the merged cryptic shared secret, the access-requesting side acknowledges with an estimated value.
• The estimated value gets examined by the authenticator in contrast to its own estimated hash value. If both the estimated values counterpart each other, then the authenticator accepts the request by permitting the authentication to the access-requesting side; or else it supposed to cease and put an end to the connection.
• At arbitrary breaks, a "challenge" message may again be sent by the authenticator to the access-requesting side, to which the access-requesting side will have to bring into being the accurate estimated response.

CHAP Packets

The Packets of CHAP are categorized into four different Packets, which comprise:

• Challenge Packet
• Response Packet
• Success Packet
• Failure Packet

Reference: CHAP

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