Challenge-Handshake Authentication Protocol for SOCKS V5

Document Type Expired Internet-Draft (aft WG)
Author Marc VanHeyningen 
Last updated 1998-01-07
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document specifies the integration of authentication based on Challenge-Handshake Authenticaton Protocol into SOCKS Version 5. The primary algorithm to be used is HMAC-MD5, although the framework is general enough to permit use of MD5 or other keyed hash algorithms. This document describes the message formats and protocol details of incorporating CHAP into the SOCKS V5 authentication ''subnegotiation.'' Support is included for authentication of server to client as well as client to server.


Marc VanHeyningen (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)