Full Disclosure mailing list archives
Re: Visual Captchas AKA Word Verification Systems
From: "Tom K" <keetch_tw () hotmail com>
Date: Mon, 14 Jun 2004 09:45:22 +0000
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 () vt edu To: Tom K <keetch_tw () hotmail com> CC: full-disclosure () lists netsys comSubject: Re: [Full-disclosure] Visual Captchas AKA Word Verification Systems Date: Sun, 13 Jun 2004 20:44:44 -0400On 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 itas 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 useby spammers to work around those captchas..... << attach3 >>
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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)