full-disclosure - Visual Captchas AKA Word Verification Systems

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Message-ID: <BAY9-F47ypzg7KazMfh000330f7@hotmail.com>
From: keetch_tw at hotmail.com (Tom K)
Subject: Visual Captchas AKA Word Verification Systems

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@...edu
>To: Tom K <keetch_tw@...mail.com>
>CC: full-disclosure@...ts.netsys.com
>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@...mail.com>  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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