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reCAPTCHA Inc.[1] is a CAPTCHA system owned by Google. It enables web hosts to distinguish between human and automated access to websites. The original version asked users to decipher hard-to-read text or match images. Version 2 also asked users to decipher text or match images if the analysis of cookies and canvas rendering suggested the page ...
The purpose of CAPTCHAs is to prevent spam on websites, such as promotion spam, registration spam, and data scraping. Many websites use CAPTCHA effectively to prevent bot raiding. CAPTCHAs are designed so that humans can complete them, while most robots cannot. [14] Newer CAPTCHAs look at the user's behaviour on the internet, to prove that they ...
Look, it's really simple: a Recaptcha has two images, one generated purposefully distorted and the other a real picture. The generated one is the one that is used to check whether the responder is human, because it's the one to which the answer is known; the other one is used to gather data from the user.
Luis von Ahn (Spanish: [ˈlwis fon ˈan]; born 19 August 1978) is a Guatemalan entrepreneur, software developer, and consulting professor in the Computer Science Department at Carnegie Mellon University in Pittsburgh, Pennsylvania. [2][3][4][5][6] He is known as one of the pioneers of crowdsourcing. He is the founder of the company reCAPTCHA ...
In computing, the Challenge-Handshake Authentication Protocol (CHAP) is an authentication protocol originally used by Point-to-Point Protocol (PPP) to validate users. CHAP is also carried in other authentication protocols such as RADIUS and Diameter. Almost all network operating systems support PPP with CHAP, as do most network access servers.
Drug-drug interaction. This is when a medication reacts with one or more other drugs. For example, taking a cough medicine (antitussive) and a drug to help you sleep (sedative) could cause the two ...
CAPTCHA is a form of reverse Turing test. Before being allowed to perform some action on a website, the user is presented with alphanumerical characters in a distorted graphic image and asked to type them out. This is intended to prevent automated systems from being used to abuse the site.
Web Accessibility Initiative. The World Wide Web Consortium (W3C)'s Web Accessibility Initiative (WAI) is an effort to improve the accessibility of the World Wide Web for people with disabilities. People with disabilities encounter difficulties when using computers generally, but also on the Web.