Definitions for CAPTCHA
captcha

WiktionaryRate this definition:2.8 / 5 votes

1. CAPTCHAnoun

   A distorted image of letters and numbers used to prevent automated use of websites.

   I find CAPTCHAs very difficult to read.

2. CAPTCHAnoun

   Anything that a human must do to prove that they are not a computer.

3. Etymology: Coined by a team of researchers at Carnegie Mellon University in 2000 as a loose

WikipediaRate this definition:3.5 / 2 votes

1. CAPTCHA

   A CAPTCHA (, an acronym for "completely automated public Turing test to tell computers and humans apart") is a type of challenge–response test used in computing to determine whether or not the user is human.The term was coined in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford. The most common type of CAPTCHA (displayed as Version 1.0) was first invented in 1997 by two groups working in parallel. This form of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen. Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, a CAPTCHA is sometimes described as a reverse Turing test.This user identification procedure has received many criticisms, especially from people with disabilities, but also from other people who feel that their everyday work is slowed down by distorted words that are difficult to read. It takes the average person approximately 10 seconds to solve a typical CAPTCHA.

WikidataRate this definition:5.0 / 2 votes

1. CAPTCHA

   A CAPTCHA is a type of challenge-response test used in computing to determine whether or not the user is human. The term was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper of Carnegie Mellon University, and John Langford of IBM. A common type of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen. Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, a CAPTCHA is sometimes described as a reverse Turing test. This term is ambiguous because it could also mean a Turing test in which the participants are both attempting to prove they are the computer.

How to pronounce CAPTCHA?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say CAPTCHA in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of CAPTCHA in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of CAPTCHA in Pythagorean Numerology is: 7

Popularity rank by frequency of use

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Captcha
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Captcha
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=CAPTCHA