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Daniel P. Lopresti

“Leveraging the CAPTCHA Problem,” Proceedings of the Second International Workshop on Human Interactive Proofs, H. S. Baird and D. P. Lopresti, eds., Berlin:  Springer-Verlag, 2005, pp. 97-110.

Efforts to defend against automated attacks on e-commerce services have led to a new security protocol known as a CAPTCHA, a challenge designed to exploit gaps in the perceptual abilities between humans and machines. In this paper, we propose a new paradigm for building CAPTCHA's which offers simultaneous benefits to both online security and pattern recognition research. We illustrate our discussion with a number of examples and suggest various directions for future work.

Paper  (PDF 1,100 kbytes)

© 2004 P.C. Rossin College of Engineering & Applied Science
Computer Science & Engineering, Packard Laboratory, Lehigh University, Bethlehem PA 18015