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CAPTCHAs: Distinguishing Humans from Computers

Posted on 11 June 2003 by Demian Turner

This interesting story came out this week in the form of a new class at PHPclasses.

A CAPTCHA (Completely Automated Public Turing to tell Computers from Humans Apart) is a program that can generate and grade tests that:

  • Most humans can pass.
  • Current computer programs cannot pass.

For example, humans can read distorted text but current computer programs cannot.

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