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How robots and spiders are causing issues, how to stop them. We can also talk about Completely Automated Public Turing Test To Tell Computers And Humans Apart - their use, their compliance issues, porn proxies, PWNtcha and other ways to defeat them. 
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3D Captcha's
Posted by: Spyware
Date: March 27, 2009 09:18PM

Just saw this on Slashdot. See it in action here.

Don't really like this one; seems like it's very easy to break at first sight.

What do you guys think?

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Re: 3D Captcha's
Posted by: thrill
Date: March 28, 2009 12:05AM

it might not be that easy to break considering the angle of the images changes from the display on the bottom to how they're displayed on top. not to mention that the bottom one is an entire image encompassing 3 items, while the ones on top are individual items.. nice one.. thanks! :)



It is not the degrees you hold, but the mind you possess. - thrill

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Re: 3D Captcha's
Posted by: Spyware
Date: March 28, 2009 11:54AM

Ugh, just noticed the three images sometimes overlap. You can just generate a new captcha though (by submitting without actually filling in anything), pressing F5 will not generate a new captcha.

Slicing the bottom image is pretty easy if the pictures don't overlap. The overlapping thing feels like an obscurity aspect if you ask me.

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Re: 3D Captcha's
Posted by: Kyran
Date: April 03, 2009 01:45AM

I have a feeling CUDA will be the solution to breaking these...

- Kyran

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