CMU-CS-02-117
Computer Science Department
School of Computer Science, Carnegie Mellon University



CMU-CS-02-117

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


Keywords: Automated Turing Tests, CAPTCHA


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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