Computer Science Department
School of Computer Science, Carnegie Mellon University
Telling Humans and Computers Apart (Automatically)
or
How Lazy Cryptographers do AI
Luis von Ahn, Manuel Blum, John Langford
February 2002
CMU-CS-02-117.ps
CMU-CS-02-117.pdf
We introduce the notion of a captcha: a program that can
differentiate between humans and computers based only on interactions over
a computer network
8 pages
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