Re: [Full-Disclosure] Visual Captchas AKA Word Verification Systems

["Tom K" <keetch_tw@xxxxxxxxxxx>]

hey,

I had actually heard that before. But my aim is not to bypass the image, but 
to solve what is essentially a Turing Test in computer vision.

Cheers, Tom Keetch



> From: Valdis.Kletnieks@xxxxxx
> To: Tom K <keetch_tw@xxxxxxxxxxx>
> CC: full-disclosure@xxxxxxxxxxxxxxxx
> Subject: Re: [Full-Disclosure] Visual Captchas AKA Word Verification 
> Systems Date: Sun, 13 Jun 2004 20:44:44 -0400
>
> On Sun, 13 Jun 2004 18:27:22 -0000, Tom K <keetch_tw@xxxxxxxxxxx>  said:
>
> > Secondly, would it be possible if anyone could kindly supply me with a 
> few
> > links to practical information on Optical Character Recognition, since I 
> am
> > still trying to improve my character recognition rate which is currently 
> at
> > 20-50% depending on the obfuscations applied. i.e. Grids, lines and 
> fuzzing
> > are easily removed, skewing is less so.
>
> If you want close to 100%, just take the image you get passed, and drop it
> as the "secret leet key" to get access to a free porn site, and let the 
> users
> decrypt it for you.  This is currently reported as a technique in active 
> use
> by spammers to work around those captchas.....
> << attach3 >>

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