Yubikey plugin for SquirrelMail 
==============================
Version 0.8.1

Copyright 2009 Richard Ferguson <yubikey@fergusnet.com>

Description
===========
This plugin enables One-Time-Password authentication with a 
Yubikey hardware token.  This provides multi-factor 
authentication in form of something you know and something 
you have.

Two-factor authentication is accomplished by requiring both
the user's password and a Yubikey OTP.  The Yubikey OTP can be
entered in one of two ways.  Either the OTP can be combined 
with the user's password in the traditional password field, or
an additional input field can be added to the login form.
Once the login form has been submitted, the entered OTP 
is verified against Yubico's authentication service.

Yubikey authenciation must be enabled in both the system
config.php as well as on an individual basis.  User 
Yubikey options are located on the personal preferences
page.

Requirements
============

Squirrelmail 1.4.0 (The 1.5.X series is not supported at this time)
libcurl 7.10.5
php5 compiled with curl support

A Yubikey with valid API ID and Key, get yours here:
http://www.yubico.com/products/order/
https://api.yubico.com/yms/getapi.php

License
=======

This plugin is released under the GNU General Public
License v2 (see the file COPYING for details).