Mutual Authentication Protocol for HTTP

The information below is for an old version of the document
Document Type Expired Internet-Draft (individual)
Author Yutaka Oiwa 
Last updated 2012-05-03 (latest revision 2011-10-31)
Replaced by draft-oiwa-httpbis-mutualauth
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This Internet-Draft is no longer active.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 a mutual authentication method for the Hyper- text Transport Protocol (HTTP). This method provides a true mutual authentication between an HTTP client and an HTTP server using password-based authentication. Unlike the Basic and Digest authentication methods, the Mutual authentication method specified in this document assures the user that the server truly knows the user's encrypted password. This prevents common phishing attacks: a phishing attacker controlling a fake website cannot convince a user that he authenticated to the genuine website. Furthermore, even when a user authenticates to an illegitimate server, the server cannot gain any information about the user's password. The Mutual authentication method is designed as an extension to the HTTP protocol, and is intended to replace the existing authentication methods used in HTTP (the Basic method, Digest method, and authentication using HTML forms).


Yutaka Oiwa (

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