The robustness of a new CAPTCHA

El, Ahmad Salah and Yan, Jeff and Marshall, Lindsay (2010) The robustness of a new CAPTCHA. In: Proceedings of the 3rd European Workshop on System Security, EUROSEC'10. ACM, FRA, pp. 36-41. ISBN 9781450300599

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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.

Item Type:
Contribution in Book/Report/Proceedings
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2213
Subjects:
ID Code:
85093
Deposited By:
Deposited On:
07 Mar 2017 11:20
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Mar 2020 08:48