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The robustness of a new CAPTCHA

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Publication date2010
Host publicationProceedings of the 3rd European Workshop on System Security, EUROSEC'10
Place of PublicationNew York
PublisherACM
Pages36-41
Number of pages6
ISBN (Print)9781450300599
<mark>Original language</mark>English
Event3rd European Workshop on System Security, EUROSEC'10 - Paris, France
Duration: 13/04/201013/04/2010

Conference

Conference3rd European Workshop on System Security, EUROSEC'10
Country/TerritoryFrance
CityParis
Period13/04/1013/04/10

Conference

Conference3rd European Workshop on System Security, EUROSEC'10
Country/TerritoryFrance
CityParis
Period13/04/1013/04/10

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.