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What is CAPTCHA?

The term CAPTCHA (for Completely Automated Public Turing Test To Tell Computers and Humans Apart) was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas Hopper and John Langford of Carnegie Mellon University.

A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot. For example, humans can read distorted text as the one shown below, but current computer programs can't.

CAPTCHAs have several applications for practical security, including (but not limited to):

Preventing Comment Spam in Blogs.
Protecting Website Registration.
Protecting Email Addresses From Scrapers.
Online Polls.
Preventing Dictionary Attacks.
Search Engine Bots.
Worms and Spam.

For more information on CAPTCHA, visit www.captcha.net

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