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 (kăp′chə) Computers
A security feature, as on a webpage, that attempts to distinguish between legitimate human users and bots by requiring users to perform a mildly challenging task such as deciphering distorted text.

[Acronym of c(ompletely) a(utomated) p(ublic) T(uring test to tell) c(omputers and) h(umans) a(part), coined in 2000 by the researchers who developed the security feature and intended to suggest a colloquial pronunciation of capture.]


(Communications & Information) a test in which the user of a website is asked to decipher a distorted image, used to protect the website against automated attacks
[C21: acronym for C(ompletely) A(utomated) P(ublic Turing Test to) T(ell) C(omputers and) H(umans) A(part)]
References in periodicals archive ?
By leveraging core insights from machine learning and neuroscience, the Vicarious AI achieves success rates up to 90% on modern CAPTCHAs from Google, Yahoo, PayPal, Captcha.
Getting rid of ugly, twisty CAPTCHAs is more important to us than making a quick buck, so we're cutting all our fees down to zero for as long as we can.
Designed to replace distorted text CAPTCHAs as a means of human identification, PlayThru is a free, cloud-based solution and is already deployed on the websites of popular business-to-consumer companies such as Quicken Loans and Fathead.
von Ahn is also co-inventor of the popular CAPTCHA and founder of the ESP Game (now Google Image Labeler, acquired by Google in 2004) and reCAPTCHA (acquired by Google in 2009), in which hundreds of millions of people help digitize books by typing CAPTCHAs on the web.
With our proprietary TYPE-IN (TM) technology, consumers can solve CAPTCHAs in half the time it takes to decipher the outmoded squiggly number and letter CAPTCHAs.
Many websites use CAPTCHAs to combat bots, but studies show that three to 10 percent of legitimate website visitors will abandon the site when presented with a CAPTCHA.
This free product for websites and blogs provides up to 25,000 Captchas per month, sufficient to meet the needs of the majority of sites.
Image based technologies from leading providers such as Google reCaptcha, Yahoo, and Microsoft have been broken time and again, which has resulted in ever harder to solve Captchas for humans.
We're giving site owners the freedom to do what they like with Captchas - whether it's simply offering a better, more readable user experience, or the ability to add their own look-and-feel, messages and other customization, depending on their audience," stated Michel Giasson, CEO and Co-Founder of NuCaptcha Inc.
The company, which has developed a game-based human authentication tool that replaces the distorted text images known as CAPTCHAs, won $15,000 for this achievement and also went on to win the Most Promising Technology Start-Up award, for an additional $100,000 investment.
For Advertisers: Extends Existing Video Advertising Campaigns to CAPTCHAs with Guaranteed Engagement - Across Clients
Captchas are automated tests to tell humans and computers apart, often through the use of distorted letters which must be retyped by the person attempting to register for an online service.