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Computer Security Resource Center

Computer Security Resource Center

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Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA)

Abbreviation(s) and Synonym(s):

CAPTCHA

Definition(s):

  An interactive feature added to web forms to distinguish whether a human or automated agent is using the form. Typically, it requires entering text corresponding to a distorted image or a sound stream.
Source(s):
NIST SP 800-63-3

  An interactive feature added to web-forms to distinguish use of the form by humans as opposed to automated agents. Typically, it requires entering text corresponding to a distorted image or from a sound stream.
Source(s):
NIST SP 800-63-2 [Superseded]