On Sun, 2007-06-10 at 17:09 +0900, Dave M G wrote: > Robert , > > Thank you for replying. > > No, PHP can do it. If you can work with pixels (and you can) then you > > can do any advanced mutation of an image... the only issue is how long > > it takes to perform the mutations. > > > That's good to know. I think I can live with a little server time to > generate the images, so long as they work well. > > > Check out the freecap code perhaps > I'm assuming you mean this one: > http://www.puremango.co.uk/cm_php_captcha_script_113.php Yes, that's the one. It was the first I stumbled upon that I felt would offer some degree of protection. I imagine at some point when I have more time I will create my own CAPTCHA, wrapping ugly code makes me feel dirty inside :) > > Good CAPTCHA - bots can't figure it out > > Bad CAPCTHA - bots can figure it out > > > Well, yes, but what exactly determines that is not obvious to me. I came > across this page: > http://sam.zoy.org/pwntcha/ > ... which conveys a feeling that some CAPTCHAs that look good actually > aren't. > > According to this page, the Yahoo CAPTCHA image, which looks quite > minimal to me, is actually one of the better ones. The yahoo one does some morphing and disturbs alignment and angle. Then the black lines running through make edge detection difficult as well as detection of colour distribution patterns. As they say though, sometimes it's difficult for a human to understand what is presented. Cheers, Rob. -- .------------------------------------------------------------. | InterJinn Application Framework - http://www.interjinn.com | :------------------------------------------------------------: | An application and templating framework for PHP. Boasting | | a powerful, scalable system for accessing system services | | such as forms, properties, sessions, and caches. InterJinn | | also provides an extremely flexible architecture for | | creating re-usable components quickly and easily. | `------------------------------------------------------------' -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
