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RE: accessibility of CAPTCHA

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Mon, 11 Sep 2006 14:25:10 -0500
To: "'Gez Lemon'" <gez.lemon@gmail.com>, <w3c-wai-gl@w3.org>
Message-ID: <018b01c6d5d8$0087f480$8283dc46@NC6000BAK>

Interesting. 

I think there is a lot of research being done on this type of approach.  I
remember Tim Berners-Lee talking about it in 2000 I think it was.  

I really think that - in the end - an approach like this will need to be
used.  As you point out - computers will be better at CAPTCHAs than most
humans - and trust is what you really want.   (When this is set up I want to
employ it first on my email !!! Only trusted people get through!  (oops -
where does that leave   relatives, 'the man',  people over 30, and the
government.  Guess I will have a much leaner mailbox. ) 

With all the problem with SPAM I would guess that this is quite difficult or
someone would have done it already.   
 
For our guidelines then - we don't have anything better than what we have?
{if you use CAPTCHAs then use more than one type}.   It doesn't sound good
enough but no one seems to be able to come up with anything better.    PF
took it on too and came to the same conclusion.   That there is no good
answer. 

Anyone else got an idea? 

Thanks Gez. 

Gregg

 -- ------------------------------ 
Gregg C Vanderheiden Ph.D. 
Professor - Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 
The Player for my DSS sound file is at http://tinyurl.com/dho6b 
 

> -----Original Message-----
> From: w3c-wai-gl-request@w3.org 
> [mailto:w3c-wai-gl-request@w3.org] On Behalf Of Gez Lemon
> Sent: Sunday, September 10, 2006 4:23 PM
> To: w3c-wai-gl@w3.org
> Subject: accessibility of CAPTCHA
> 
> 
> Hello everyone,
> 
> In the 31st August 2006 teleconference, I had an action item 
> to explore CAPTCHAs to see if we could come up with a 
> sufficient technique for people with multiple disabilities [1].
> 
> I explored several techniques, but was unable to come up with 
> anything that could distinguish the intention of the user by 
> ability alone.
> Instead, I came to the conclusion that there could never be a 
> truly accessible technique using a CAPTCHA. Although I 
> couldn't think of a method using a CAPTCHA, I do think it 
> would be possible to solve the problem using a social 
> networking web service. It's quite an involved technique, so 
> I've written it up online to make it a bit easier to read [2].
> 
> [1] http://www.w3.org/WAI/GL/2006/08/31-wai-wcag-minutes.html#item08
> [2] http://juicystudio.com/article/accessibility-of-captcha.php
> 
> Regards,
> 
> Gez
> 
> --
> _____________________________
> Supplement your vitamins
> http://juicystudio.com
> 
> 
Received on Monday, 11 September 2006 19:25:22 GMT

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