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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 ?
At first, Google used reCAPTCHA to help computers perform optical character-recognition (OCR) on books and back issues ofThe New York Times.
Order forms that use a CAPTCHA or Google reCAPTCHA can help protect eCommerce sites against credit card testing, as bots and automated scripts will not be able to submit the order without passing the CAPTCHA challenge.
Whereas today's most advanced AI (artificial intelligence) technologies use neural networks that require massive amounts of data to learn from, sometimes millions of examples, the researchers said their system needed just five training steps to crack Google's reCaptcha technology.
The cracking of Captcha and reCaptcha is seen as a sign where there might be a need for an even more robust procedure for human verification, says the report.
In[6], authors suggested another input mechanisms aimed at improving the usability of ReCaptcha on smartphones.
Eventually, Google bought ReCaptcha and later came up with the "No Captcha ReCaptcha", which was a way to have users click a button to separate humans from computers.
Next, in 2007 reCAPTCHA, originated by Luis Von Ahn.
En 2006, ya convertido en profesor de Carnegie Mellon, Von Ahn y uno de sus estudiantes inventaron una variante de Captcha, que rebautizaron Recaptcha, diferente del primero porque aprovecha las palabras correctamente escritas por los usuarios para corregir libros digitalizados.
1 release introduces new features into the CMS such as improved front end module editing, decoupling of weblinks, composer integration, Google new reCaptcha and security improvements by implementing UploadShield code which can detect most malicious uploads by examining their filenames and file contents.
438) Similarly, the reCAPTCHA security feature on many Web registration forms, in which users type words appearing in an image, is actually part of a worldwide effort to digitize books and other content.
The workshop brought together 31 attendees from industry and academia, with a strong representation from universities (42 percent of the attendees), the largest crowdsourcing customers like Google, Microsoft, and Xerox (39 percent of the attendees), and the leading crowdsourcing platforms like Amazon's Mechanical Turk, CrowdFlower, Galaxyzoo, reCAPTCHA, and Mobile-works (19 percent of the attendees).
William Eggers' praise for Luis von Ahn's reCAPTCHA idea overlooks one vexing problem ("Crowdsourcing Social Problems," January).