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The robustness of a new CAPTCHA

Lookup NU author(s): Ahmad Salah El Ahmad, Dr Jeff Yan, Emeritus Professor Lindsay MarshallORCiD


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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.

Publication metadata

Author(s): Salah El Ahmad A, Yan J, Marshall L

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Proceedings of the third European Workshop on System Security (EUROSEC)

Year of Conference: 2010

Pages: 36-41

Publisher: ACM Press


Library holdings: Search Newcastle University Library for this item

ISBN: 9781450300599