Sunday, February 22, 2009

Capatcha: No more secure

Capatchas have long been the basis of security in many ongoing web services. Capatchas have been used to provide security against bots and automated systems, that try to sign up, brute forcing site passwords, posting articles etc. Capatchas have become the very foolproof verification that whatever is trying to access a particular page is a person and not a machine.

But now, even CAPATCHAs are vulnerable to getting cracked. Researchers from Simon Fraser University and Berkeley University have found out ways to counter attack the system of Capatchas. No more will any bot be debarred from doing whatever it is designed to.

The researchers have programmed a system, that can crack Yahoo capatchas with a success rate of 92%. The researchers include Greg Mori from UC Berkeley Computer Vision Group and Simon Fraser University and Jitendra Malik from UC Berkeley Computer Vision Group.

The research had been published in NEWS articles back in 2002. I'm not sure if Yahoo still uses the system they'd been able to crack, but their research does prove that even Capatchas are vulnerable and further research could even bring the current Capatcha technologies down on their knees.

The basis of the algorithm

The algorithm was based on simple image recognition algorithms. The same algorithms had been used to recognize people, objects or text in images. They simply used that algorithm and named their project EZ-Gimpy.

Their original work can be found here.

Reference:
assertTrue(this): How CAPTCHAs can be beaten

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