Re: Going from simple to super CAPTCHA

On 6/12/07, Richard Lynch <ceo@l-i-e.com> wrote:

On Tue, June 12, 2007 6:42 am, Stut wrote: tedd wrote:

At 7:38 PM +0200 6/11/07, Tijnema wrote:

Well, if you think this is the uncrackable* solution, create it and i'll see if I can crack it ;) Tijnema * I hope you don't mean the same uncrackable as AACS did: "HD-DVD is uncrackable" ;)

As I provided in another post, try cracking this: http://sperling.com/examples/dot-captcha/

I've not written code to do it but that seems pretty simple to me. You get the image from circle.php, detect where the circle is - pretty simple - and pass those coords through when posting the form. Or have I missed something? He thinks you can't figure out where the circle is, as he's positioning it ... I'm not quite sure yet how, but I suspect it's the transparent borders that vary in width that move the dot around. At any rate, it's probably NOT impossible to detect the position of the blue dot one way or another, even if you have to write something special to do it.

A PFP (Pixel-For-Pixel) Approach would do the job, but I don't think there exists software yet for it. I would have to get the file format of the bitmap you're using (PNG I Guess), and then parse it PFP. Tijnema