Word:

Challenge-Handshake Authentication Protocol

(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.
Browse
chalk out
Chalk period
chalk pit
chalk talk
chalk up
chalkboard
Chalkcutter
Chalkiness
chalkpit
Chalkstone
Chalky
challah
Challenge
Challenge to the array
Challenge to the favor
Challenge to the polls
-- Challenge-Handshake Authentication Protocol --
Challengeable
challenged
Challenger
challenging
Challis
Chalmers University of Technology
Chalon
Chalons
Chalons-sur-Marne
Chalybean
Chalybeate
Chalybeous
Chalybite
Cham
Chamade
Chamaea
Definitions Index: # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

About this site and copyright information - Online Dictionary Home - Privacy Policy