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Sunday, June 22, 2008

More of Those Annoying Captcha Images

I just built a service captcha.cc which makes it easier for people who build web forms to paste code in that will block form spam. Not that there aren't other people who do this, but the popular ones are often weird or insecure. Recaptcha is too easy to break, tesseract and a bit of gaussian scrubbing and dict-guessing makes short work of it, makes me wonder what OCR engine they are using in the first place that fails so often.

Nifty features include server-validation without requiring a callback (md5 hash does the trick), ajax-friendly javascript code to prevent unnecessary form reloads on failures, ability to block proxies, and support for English, Spanish and French languages.

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