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Line 9: ==Working cycle== CHAP is an authentication scheme used by [[Point to Point Protocol\|Point to Point Protocol (PPP)]] servers to validate the identity of remote clients. CHAP periodically verifies the identity of the [[client (computing)\|client]] by using a [[Handshaking\|three-way handshake]]. This happens at the time of establishing the initial [[Link Control Protocol\|link (LCP)]], and may happen again at any time afterwards. The verification is based on a [[shared secret]] (such as the client's password).<ref name="Forouzan2007">{{cite book\|author=Forouzan\|title=Data ~~Commn~~Communications & Networking 4E Sie\|url=https://books.google.com/books?id=6HaNKmfBK1oC&pg=PA352\|accessdate=24 November 2012\|year=2007\|publisher=McGraw-Hill Education (India) Pvt Limited\|isbn=978-0-07-063414-5\|pages=352–}}</ref> # After the completion of the link establishment phase, the authenticator sends a "challenge" message to the peer.

Challenge-Handshake Authentication Protocol: Difference between revisions