Re: Going from simple to super CAPTCHA

On Tue, June 12, 2007 6:25 am, tedd wrote: > At 6:22 PM +0200 6/11/07, Tijnema wrote: >>Server builds up a database of pictures, client does the same with >> MD5 >>check, and problem solved...:) >> >>Tijnema > > Tijnema: > > Not exactly, I don't think you could MD5 this: > > http://sperling.com/examples/dot-captcha/ > > To make variations of the theme. I can place any type of picture, any > number of pictures, anywhere and ask the user to click on one (i.e., > click on the apple) -- there's nothing to MD5, is there? Nothing to MD5, but the edge detection to find the blue dot would probably be trivial. Haven't we beat this horse to death yet? *ANY* CAPTCHA at all is going to stop the bulk of the spam. If your CAPTCHA is not the same (or very similar to) one that's employed on a large-market-share system, then it's unlikely anybody will take the effort to OCR/MD5/crack it. If somebody has enought time to OCR/MD5/crack it, you probably aren't going to be able to stop them, no matter what your CAPTCHA is. -- Some people have a "gift" link here. Know what I want? I want you to buy a CD from some indie artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So?