On 16/05/10 07:27, emijrp wrote:
Solving captcha during registration is mandatory. Can this be replaced with
a sound captcha for visual impairment people? It is a suggestion to the
usability project too. Thanks.
Audio CAPTCHAs, like visual CAPTCHAs, are not accessible for all
people and do not conform to W3C accessibility guidelines. What's
more, they're easier to crack than visual CAPTCHAs due to their
one-dimensional nature. This is especially true if you use a public
source dictionary of spoken phrases, against which an FFT correlation
can be run.
I think we should get rid of the CAPTCHA altogether and just rely on
URL blacklists, rate limiting and a semi-automated tag and revert
system. At least it's future-proof. Our visual CAPTCHA can already be
cracked. Some day, every spammer will have access to a library capable
of solving it.
-- Tim Starling