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- Has CAPTCHA Been "Broken"? http://www.codinghorror.com/blog/archives/001001.html 117 comments
- Blacklists Don't Work http://www.codinghorror.com/blog/archives/001009.html 99 comments
- Blacklists Don't Work http://blog.codinghorror.com/blacklists-dont-work/ 50 comments
- CAPTCHA is Dead, Long Live CAPTCHA! http://blog.codinghorror.com/captcha-is-dead-long-live-captcha/ 1 comment
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