Full Disclosure mailing list archives
Re: Visual Captchas AKA Word Verification Systems
From: Valdis.Kletnieks () vt edu
Date: Sun, 13 Jun 2004 20:44:44 -0400
On Sun, 13 Jun 2004 18:27:22 -0000, Tom K <keetch_tw () hotmail 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.....
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Current thread:
- Visual Captchas AKA Word Verification Systems Tom K (Jun 13)
- Re: Visual Captchas AKA Word Verification Systems Valdis . Kletnieks (Jun 13)
- Dull-Disclosure Curt Purdy (Jun 14)
- Re: Dull-Disclosure Eric Paynter (Jun 15)
- <Possible follow-ups>
- Re: Visual Captchas AKA Word Verification Systems Tom K (Jun 14)