On Tue, 2007-06-12 at 15:35 +0100, Robin Vickery wrote: > On 10/06/07, Dave M G <martin@xxxxxxxxxxxxx> wrote: > > PHP General List, > > > > With a little help from the web, and help from this list, I have a > > simple CAPTCHA image that works within the content system I'm building. > > > > But it's *really* simple. Basically white text on a black background, > > with a couple of white lines to obscure the text a little. > > > > I'm pretty sure that in its current state, my CAPTCHA image could be > > cracked by OCR software from the 1950s. > > > > So I'm hoping to take it up to the next level. > > How about using the spammers' own tricks against them? They try hard > to make image spam pass through filters and resist OCR analysis. > > http://csoonline.com/read/040107/fea_spam.html The problem is that spammers don't care about the 10% or so of people that don't understand their images. They are playing a statistics game where they only rely on a tiny fraction of people understanding the obfuscated image and enquiring further. Web sites on the other hand often care about the people that don't understand the contents of the image. This is why CAPTCHA is a less than perfect solution. 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
