From: Kevin Austin ()
Date: May 3, 2008
Subject:
CAPTCHA technology broken
Begin forwarded message:
From: AUDITORY automatic digest system
Date: 2008 May 3 12:19:54 AM EDT (CA)
Subject: Gmail Audio CAPTCHA Broken
A slashdot posting today got me thinking about auditory tasks which
require a cognitive component which computers do not (yet) possess.
http://tech.slashdot.org/article.pl?sid=08/05/02/1426253
The Microsoft Research Asirra "cats&dogs" CAPTCHA seems like an
elegant visual solution to the problem -- low cognitive load on the
user, high 'cognitive' load on the computer. I'm wondering if there
is an auditory categorization task that is analogous to the Asirra
scheme?
-Tony
P.S. If you go to the gmail signup page now, it sounds like Google has
decreased the SNR of the auditory task in an effort to thwart this
type of attack. The resulting audio is pretty annoying.