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Description

CAPTCHAs are tests that distinguish humans from software robots in an online environment. 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.

Details

Title
Image Recognition CAPTCHAs
Creator
Computer Science Division, Publisher
Chew, Monica, Author
Tygar, J. D., Author
Published
2004-06-10
Full Collection Name
Electrical Engineering & Computer Sciences Technical Reports
Other Identifiers
CSD-04-1333
Type
Text
Format
technical reports
Extent
19 p
Archive
The Engineering Library
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