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Re: reCAPTCHA: AOL's CAPTCHA

From: Ben Maurer <bmaurer@andrew.cmu.edu>
Date: Wed, 18 Jul 2007 11:37:41 -0700 (PDT)
To: "Evans, Donald" <Donald.Evans@corp.aol.com>
cc: wai-xtech@w3.org
Message-ID: <Pine.LNX.4.64-044.0707181110030.5857@unix31.andrew.cmu.edu>

- the visual CAPTCHA is very insecure. It's easy to segment and 
minimal distortion has been applied to the letters. Amatuer projects have 
broken similar CAPTCHAs pretty easily. With audio its harder to tell where 
the security stands.

- After refreshing a few times (but not signing up) you get the message:

Thank you for your interest in obtaining a screen name to use this 
service.
At this time, we are unable to register you for this service. We regret 
any inconvenience.

This is annoying for those trying to sample lots of CAPTCHAs :-).

- The visual CAPTCHA has an unnecessarially low contrast between the 
forground and the background. It'd be easier for visual users if the 
background was unchanging. This does not reduce the security any (however, 
there's not much there in the visual one...)

- The labeling is confusing "can't see the image" and "can't hear the 
audio" arent' the right labels.

- I had a bit of trouble with the audio captcha on ubuntu. I need to test 
this out a bit more, but can't because I can't look at the signup page any 
more.


On Wed, 18 Jul 2007, Evans, Donald wrote:

> This is such a great thread, I thought I would ask some of you to take a
> look at AOL's CAPTCHA.
>
>
>
> Go to www.aol.com <http://www.aol.com/>
>
> Select the link "Get Free AOL Mail"
>
> Navigate to the H tag "Verify Your Registration"
>
> Select the link "Can't see this image"
>
>
>
> Comments welcome!
>
>
>
> Donald F. Evans
>
> Sr. Program Manager
>
> Office of Accessibility
>
> AOL LLC
>
> AIM: donaldfevans
>
> Email: Donald.Evans@corp.aol.com
>
> Tel: (703) 265-5952
>
>
>
>
Received on Wednesday, 18 July 2007 18:37:53 GMT

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