Challenge-Handshake Authentication Protocol

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What Wikipedia says

In computing, the Challenge-Handshake Authentication Protocol (CHAP) is an authentication protocol originally used by Point-to-Point Protocol (PPP) to validate users. CHAP is also carried in other authentication protocols such as RADIUS and Diameter.

Excerpt from the Wikipedia article “Challenge-Handshake Authentication Protocol”, under the CC BY-SA 4.0 license. Read the article on Wikipedia