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'Anti Robot' Registrations

From: Matthew Smith <matt@kbc.net.au>
Date: Sun, 25 Jan 2004 10:03:52 +1030
Message-ID: <401300E0.6050501@kbc.net.au>
To: WAI Interest Group <w3c-wai-ig@w3.org>

Greetings All

I have seen on this list, on more than one occassion, discussions about the 
technique used by Yahoo and others to prevent 'robot' registrations by 
presenting a graphic of a word or number that has to be keyed into a form.

As there is no appropriate alt text to these images (which would defeat the 
point, making them machine-readable), this obviously constitues an accessibility 

This may have been done before, but what I propose for such an application is this:

A sentence is selected at random, say from a book (Project Gutenberg text?) or a 
series of random words.

An input field with the message "please select the fifth word from the following 
sentence" is displayed, followed by the sentence/words.  It would probably be 
useful to put an anchor by the input field so that the user could skip back to 
it easily once they had read the sentence/words.

I can see that a 'robot' could be programmed to recognise ordinals, but by 
varying the text, it would make it harder for 'robot' programmers to make sense 
of what is being asked.




Matthew Smith
Kadina Business Consultancy
South Australia
Received on Saturday, 24 January 2004 18:33:57 UTC

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