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Re: Captcha and inaccessiblity

From: Andy Heath <a.k.heath@shu.ac.uk>
Date: Mon, 20 Oct 2003 07:09:24 +0100
Message-ID: <3F937C14.1000409@shu.ac.uk>
To: "w3c-wai-gl@w3.org" <w3c-wai-gl@w3.org>


> This kind of questioning is notoriously difficult.

For those people unfortunately old enough to remember
(like me) its the Turing Test.  And it *is* notoriously
difficult.  If I were a spammer/hacker with the aim of
getting past these things (which I'm not) I might even find
the images technique annoying enough to build in some image
recognition alogorithms to my robot - I suspect these techniques
are quite good these days.

I guess the only really solid way to do this is with
bypass codes.  Some kind of randomly changing pattern
could be effective but there would be an intelligence
threshhold for that and some people would be excluded.

Andy
-- 
andy
_______________________________________________
Andy Heath
Sheffield Hallam University
andy@andyheath.org.uk
Received on Monday, 20 October 2003 02:34:30 GMT

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