___/ On Sun 12 Mar 2006 19:53:07 GMT, [ Gregory Wild-Smith ] wrote : \___
Mike Little wrote:
It is usually not usability but *accessibility* which becomes a
problem with captchas.
That is, if the capcha is an image based one, then people with vision
problems, including but not limited to the blind, cannot use the
system.
Give the visitor a simple math riddle instead. Or take the approach of Eric
Meyer, who *does* understand usability, and re-use Gatekeeper (a WordPress
plugin) to pose a trivial question.
Also see: http://www.trenholm.co.uk/?p=113
Also, aside from the more obvious problems, most capucha's can be
defeated pretty easily if you actually want to devote some cpu cycles
to it. They really only protect from really basic scripting attacks.
The following is a rather popular proof-of-contention page:
http://sam.zoy.org/pwntcha/
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