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CHAP Last modified: Friday, June 21, 2002
Short for Challenge Handshake Authentication Protocol, a type of authentication in which the authentication agent (typically a network server) sends the client program a random value that is used only once and an ID value. Both the sender and peer share a predefined secret. The peer concatenates the random value (or nonce), the ID and the secret and calculates a one-way hash using MD5. The hash value is sent to the authenticator, which in turn builds that same string on its side, calculates the MD5 sum itself and compares the result with the value received from the peer. If the values match, the peer is authenticated. By transmitting only the hash, the secret can't be reverse-engineered. The ID value is increased with each CHAP dialogue to protect against replay attacks. Contrast with PAP.		Related Categories Security Related Terms authentication challenge-response MD5 PAP CHAP Products : Top Store Offers: L.L.Bean  49.00Turn any pair of pants into rugged, briar-busting upland pants. Made with the same 1,000-denier nylon facing fabric as our legendary Briar Pants, so t... Cabela's  19.99These 1,000denier chaps offer heavyduty protection; a kneelength zipper permits easy on and off over boots. Inseam sizes: Short 27"29", Regular 30"32"... eBay  24.99 eBay  34.95In Stock and Ready to Ship! These are TOO CUTE! New Infant Baby Kids Cowboy Chinks Made right here at the Ranch Burgundy and Pink Metallic These are a... UnbeatableSale, Inc.  18.90wrangle up some cattle in our cowboy chaps. add a vest for a complete cowboy costume. elastic waist for an adjustable fit. chaps secure with elastic s... Compare all matches: 4572 Store Offers
PPP Challenge Handshake Authentication Protocol (CHAP) RFC This document defines a method for Authentication using PPP, which uses a random Challenge, with a cryptographically hashed Response which depends upon the Challenge and a secret key.