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m Fixing links to disambiguation pages, replaced: three-way handshake. This happens at the time of establishing the initial link (LCP), and may happen again at any |
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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 (protocol)|Diameter]].
Almost all [[network operating system]]s support PPP with CHAP, as do most [[network access server]]s. CHAP is also used in [[PPPoE]], for authenticating DSL users.
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