Re: Going from simple to super CAPTCHA

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On Tue, 2007-06-12 at 21:46 +0200, Tijnema wrote:
> On 6/12/07, Robert Cummings <robert@xxxxxxxxxxxxx> wrote:
> > On Tue, 2007-06-12 at 15:06 -0400, Daniel Brown wrote:
> > >
> > >     Okay, here's something I whipped up today:
> > >
> > >     http://pilotpig.com/captcha/index.php
> > >
> > >     Works pretty well, but keep in mind that it's in the very early
> > > stages.  I randomized the position and size to assist in throwing off
> > > Turing detection, and added color not only to screw with the
> > > color-detection schemes, but also in case it overlays the target
> > > bubble.  It's 600x400, so that's 240,000 potential spots to click,
> > > with random size, location, and area coordinates thrown in the mix.
> >
> > Nice, one problem though... the text is unreadable on some backgrounds.
> > I suggest you outline it or something. Easy to do by drawing the font 5
> > times. 4 times for the outline where you offset the drawing location by:
> >
> >    (-1, 0), (0,1), (1,0), (0,1)
> >
> > Then change colour and draw the font at the original location.
> >
> > Cheers,
> > Rob.
> 
> Yes noticed that problem too, but this seems quite easy to crack, Get
> the text from the image, get the color of the text and search for tha
> tcolor circle.
> 
> Tijnema
> 
> Btw, I clicked the pixel in the middle, and did 10 refreshes, and I
> had 5 right....

*lol* Yeah, some of the circles are pretty big... not sure he accounted
for the circle in question being completely hidden by other circles.

Cheers,
Rob.
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