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ICDAR
2005
IEEE

ScatterType: A Legible but Hard-to-Segment CAPTCHA

9 years 5 months ago
ScatterType: A Legible but Hard-to-Segment CAPTCHA
The ScatterType CAPTCHA, designed to resist character– segmentation attacks and shown to be highly legible to human readers, is analyzed for vulnerabilities and is offered for experiments in automatic attack. As introduced in [BR05], ‘ScatterType’ challenges are images of machine-print text whose characters are cut into pieces which then drift apart, in an attempt to frustrate segment-then-recognize computer vision attacks. Analysis of experimental human legibility data has shown that better than 95% correct legibility can be achieved through judicious choice of the pseudorandom generating parameters [BMW05]. That analysis is summarized and discussed here as motivation for a discussion of potential vulnerabilities. An invitation to attack ScatterType is offered.
Henry S. Baird, Michael A. Moll, Sui-Yu Wang
Added 24 Jun 2010
Updated 24 Jun 2010
Type Conference
Year 2005
Where ICDAR
Authors Henry S. Baird, Michael A. Moll, Sui-Yu Wang
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