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2004
Springer

Image Recognition CAPTCHAs

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Image Recognition CAPTCHAs
CAPTCHAs are tests that distinguish humans from software robots in an online environment [3, 14, 7]. We propose and implement three CAPTCHAs based on naming images, distinguishing images, and identifying an anomalous image out of a set. Novel contributions include proposals for two new CAPTCHAs, the first user study on image recognition CAPTCHAs, and a new metric for evaluating CAPTCHAs.
Monica Chew, J. D. Tygar
Added 02 Jul 2010
Updated 02 Jul 2010
Type Conference
Year 2004
Where ISW
Authors Monica Chew, J. D. Tygar
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