Challenge-Handshake Authentication Protocol

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(networking, security, standard, protocol)

Challenge-Handshake Authentication Protocol - (CHAP) An authentication scheme used by PPP servers to validate the identity of the originator of the connection upon connection or any time later.

CHAP applies a three-way handshaking procedure. After the link is established, the server sends a "challenge" message to the originator. The originator responds with a value calculated using a one-way hash function. The server checks the response against its own calculation of the expected hash value. If the values match, the authentication is acknowledged; otherwise the connection is usually terminated.

CHAP provides protection against playback attack through the use of an incrementally changing identifier and a variable challenge value. The authentication can be repeated any time while the connection is open limiting the time of exposure to any single attack, and the server is in control of the frequency and timing of the challenges. As a result, CHAP provides greater security then PAP.

CHAP is defined in RFC 1334.

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No references found			Challenge-Handshake Authentication Protocol (CHAP) is an authentication protocol that can be used to authenticate iSCSI initiators at target login. Information security demands a layered approach in IP SANs by Sante, Zophar / Computer Technology Review For remote dial-up connections, EAP provides a stronger authentication mechanism than either PPP or Challenge-Handshake Authentication Protocol (CHAP). Cyclades Strengthens Industry Leadership with Enhancements to Its ... by Business Wire Security: Associating specific LUN on an iSCSI target with specific hosts can be managed through a few iSCSI access methods, such as Challenge-Handshake Authentication Protocol (CHAP), which uses an authentication token to authorize access to a particular initiator. iSCSI: changing the storage landscape by Rogers, Steve / Computer Technology Review			Chaliapin, Fedor Ivanovich Chaliapin, Feodor Chaliapin, Feodor Ivanovich Chalice chalice cell chalicosis Chalicotheriidae Chalicotherioidea Chalier, Marie Joseph Chaling Chalk chalk line Chalk Plants Chalk River Chalk Sunday chalkboard chalkboard trim chalked chalking Chalkís Chalkley, Thomas chalkstone chalky challenge Challenge of Judges Challenge-Handshake Authentication Protocol challenge-response challenge/response Challenger Challenger expedition Challenger, Professor challenging signal Challens, Mary challiho challis Challoner, Richard Chalmers University of Technology Chalmers, Thomas chalmersite Chalna Chalon-sur-saone Chalon-sur-saône chalones Châlons-en-Champagne Chalons-sur-Marne Châlons-sur-Marne Chaloupecky, Vaclav Chaloupecký, Václav Chalukya Chalupka, Jan Chalúpka, Ján			Challenge of Judges Challenge of Missouri Annual List Challenge Of Reverse Engineering Challenge of the Super Friends challenge on Challenge Original Brazilian Vale Tudo Challenge Program Management Team Challenge Program on Water and Food Challenge ProMode Arena Challenge Rating Challenge Stradale challenge the credibility of challenge to Challenge to Learn Challenge to the array Challenge to the favor Challenge to the polls challenge to the sufficiency of the pleading Challenge Training and Consulting, Inc. Challenge TV Challenge TV Challenge TV Challenge TV Challenge Valley Challenge X Challenge Your Assumptions Challenge Your Disability Initiative Challenge-Handshake Authentication Protocol Challenge-response Challenge-response Challenge-response authentication Challenge-Response Authentication Mechanism Challenge-Response Authentication Mechanism-Message Digest 5 Challenge-Response Mechanism Challenge/response Challenge/Response Authentication of Cryptographic Keys Challenge/Response Email Verification Challenge? Challenge? Challenge? Challenge? challengeable challengeable challengeable challengeable challengeable challenged challenged challenged challenged challenged Challenged Athletes Foundation Challenged Athletes of West Virginia challenger challenger challenger challenger challenger

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