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.
Abstract
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)
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