Re: Going from simple to super CAPTCHA

From: Date: Tue, 12 Jun 2007 20:05:45 +0000
Subject: Re: Going from simple to super CAPTCHA
References: 1 2 3 4 5 6 7 8 9 10  Groups: php.general 
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On 6/12/07, Robert Cummings <robert@interjinn.com> wrote:
On Tue, 2007-06-12 at 21:46 +0200, Tijnema wrote: On 6/12/07, Robert Cummings <robert@interjinn.com> 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.
Well, that gives me a more easier way to crack it, The top-most circle is the one to be clicked :) Tijnema

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