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How robots and spiders are causing issues, how to stop them. We can also talk about Completely Automated Public Turing Test To Tell Computers And Humans Apart - their use, their compliance issues, porn proxies, PWNtcha and other ways to defeat them. 
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Re: The Heyes CAPTCHA
Posted by: thornmaker
Date: May 31, 2007 05:21PM

this reminds me of knuth's story about when he thought he could create a good random number generator by making a ridiculously complicated algorithm. after very little analysis though, he found that it had very short cycles and even a fixed point if i recall correctly. the point being is that often times you can't just throw in some additional complexity to make something more secure. a much better approach is to come up with a cleaner design. now i'm not saying a good javascript based captcha is impossible, i'm just saying you're not going to end up with one by adding additional complexity to an already known weak one.

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Re: The Heyes CAPTCHA
Posted by: Anonymous User
Date: June 01, 2007 02:26AM

pure wisdom, history teaches best. thanks, it's a nice insight!

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