CAPTCHA

Shang Tsung <[email protected]>
Newsgroups gmane.comp.security.web-applications
Message-ID <[email protected]> 
We are planning to use a CAPTCHA in order to stop spam engines from
filling our Online Forms. From a quick research I made, I found there
are good and there are bad types of CAPTCHA.

Does anyone know if there are any standard and secure implementations
of CAPTCHA that we can use?

Any good articles on the subject?

Thanks,
Shang Tsung



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