The robustness of a new CAPTCHA

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  2. Ahmad Salah El Ahmad
  3. Dr Jeff Yan
  4. Dr Lindsay Marshall
Author(s)Salah El Ahmad A, Yan J, Marshall L
Publication type Conference Proceedings (inc. Abstract)
Conference NameProceedings of the third European Workshop on System Security (EUROSEC)
Conference LocationParis, France
Year of Conference2010
Legacy Date13 April 2010
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CAPTCHA is a standard security technology that presents tests to tell computers and humans apart. In this paper, we examine the security of a new CAPTCHA that was deployed until very recently by Megaupload, a leading online storage and delivery website. The security of this scheme relies on a novel segmentation resistance mechanism. However, we show that this CAPTCHA can be segmented using a simple but new automated attack with a success rate of 78%. It takes about 120 ms on average to segment each challenge on a standard desktop computer.
PublisherACM Press
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