Investigating CAPTCHAs Based on Visual Phenomena

Authors:
Anja B. Naumann;Thomas Franke;Christian Bauckhage
Affiliations:
Deutsche Telekom Laboratories, Berlin, Germany 10587;Cognitive and Engineering Psychology, Chemnitz University of Technology,;Fraunhofer Institute for Intelligent Analysis and Information Systems IAIS,
Venue:
INTERACT '09 Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part II
Year:
2009

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Abstract

We propose and evaluate several novel types of CAPTCHAs (test to tell computers and humans apart) that exploit characteristics of the human visual system. Perceptions caused by the effect of lightness constancy or grouping phenomena due to transparent motion are hard to emulate on computers and may thus provide novel authentication mechanisms.