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The robustness of a new CAPTCHA

Lookup NU author(s): Ahmad Salah El Ahmad, Dr Jeff Yan, Dr Lindsay Marshall

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Abstract

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)

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

Year of Conference: 2010

Pages: 36-41

Publisher: ACM Press

URL: http://delivery.acm.org/10.1145/1760000/1752052/p36-el_ahmad.pdf

Library holdings: Search Newcastle University Library for this item

ISBN: 9781450300599


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