CAPTCHA

Also known as Completely Automated Public Turing test to tell Computers and Humans Apart, CAPTCHA (Challenge-response test)

upright=1.35|thumb|This CAPTCHA (GIMPY-R, c. 2005) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.

AI overview

A CAPTCHA is a test that asks you to prove you're human by completing a task a computer can't easily do, like reading distorted letters or identifying objects in images. Websites use CAPTCHAs to prevent automated programs from accessing accounts or abusing services.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Official website: captcha.net
Image: Captcha.svg

Show 2 more facts

Commons category: Captcha
inception: 2000-01-01

Sources (2)

via Wikidata · CC0

~14 min read

Article

15 sections

Contents

Purpose
History
Characteristics
Accessibility
Circumvention
Machine learning–based attacks
Human labor
Outsourcing to paid services
Insecure implementation
Alternative CAPTCHAs
Malicious CAPTCHA imitations
See also
References
Further references
External links

upright=1.35|thumb|This CAPTCHA (GIMPY-R, c. 2005) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.

A CAPTCHA ( ) is a type of challenge–response Turing test used in computing to determine whether the user is human in order to deter bot attacks and spam.