internet.com
You are in the: Small Business Computing Channelarrow View Sites +
Small Business Technology
» ECommerce-Guide | Small Business Computing | Webopedia | WinPlanet |  »Close
Webopedia.com
Enter a word for a definition... ...or choose a computer category.
 
 

menu
   Home
   Term of the Day
   New Terms
   Pronunciation
   New Links
   Quick Reference
   Did You Know?
   Categories
   Tech Support
   Webopedia Jobs
   About Us
   Link to Us
   Advertising
  

talk to us
   Submit a URL
   Suggest a Term
   Report an Error

internet.com
Developer
International
Internet Lists
Internet News
Internet Resources
IT
Linux/Open Source
Personal Technology
Small Business
Windows Technology
xSP Resources
Search internet.com
Advertise
Corporate Info
Newsletters
Tech Jobs
E-mail Offers
commerce
  Be a Commerce Partner
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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.

E-mail this definition to a colleague


For internet.com pages about CHAP . Also check out the following links!

Related Links

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.

related categories

Security

related terms

authentication

challenge-response

MD5

PAP


webopedia
Give Us Your
Feedback


CHAP Products :


Top Store Offers:
Dennis Kirk  47.99Free freight on orders over $100. >Mfg Part Number: 7410 >Add a classic styling touch. >Leather laces provided for easy installation. >Styled to match...
Longdistance biker  191.99Available in both men's and women's sizes. Aniline milled leather. Nylon lining to below the knee. 6" fringe along side. Snap-down bottom closure. Adj...
PETsMART  249.99Black, smooth chaps in superior cowhide.
Dennis Kirk  56.99Free freight on orders over $100. >Mfg Part Number: 70N0 >Add a classic styling touch. >Leather laces provided for easy installation. >Styled to match...
Longdistance biker  179.99Available in both men's and women's sizes. Aniline milled leather. Nylon lining to below knee. Snap-down bottom closure. Adjustable, lace-up back.

Compare all matches:
607 Store Offers



JupiterWeb networks:

internet.comearthweb.comDevx.com graphics.com

Search JupiterWeb:

Jupitermedia Corporation has two divisions:
Jupiterimages andJupiterWeb


Legal Notices, Licensing, Reprints, & Permissions, Privacy Policy.

Jupitermedia Corporate Info | Newsletters | Tech Jobs | Shopping | E-mail Offers