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From: Valdis.Kletnieks at vt.edu (Valdis.Kletnieks@...edu) Subject: Visual Captchas AKA Word Verification Systems 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..... -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 226 bytes Desc: not available Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20040613/cec6af21/attachment.bin
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