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CAPTCHA
Completely Automated Public Turing Test to tell Computers and Humans Apart (CAPTCHA) ( ) is a type of challenge–response authentication, challenge–response turing test used in computing to determine whether the user is human in order to deter bot attacks and spam. The term was coined in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford (computer scientist), John Langford. It is a contrived acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart." A historically common type of CAPTCHA (displayed as reCAPTCHA v1) was first invented in 1997 by two groups working in parallel. This form of CAPTCHA requires entering a sequence of letters or numbers from a distorted image. Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, CAPTCHAs are sometimes described as reverse Turing tests. Two widely used CAPTCHA services are Google's reCAPTCHA and the independent hC ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ReCAPTCHA
reCAPTCHA Inc. 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 was being downloaded automatically. Since version 3, reCAPTCHA will never interrupt users and is intended to run automatically when users load pages or click buttons. The original iteration of the service was a mass collaboration platform designed for the digitization of books, particularly those that were too illegible to be scanned by computers. The verification prompts utilized pairs of words from scanned pages, with one known word used as a control for verification, and the second used to crowdsource the reading of an uncertain word. reCAPTCHA was originally developed by Luis von Ahn, David Abraham, Manuel Blum, Michael Crawford, B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ReCAPTCHA V1
reCAPTCHA Inc. 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 was being downloaded automatically. Since version 3, reCAPTCHA will never interrupt users and is intended to run automatically when users load pages or click buttons. The original iteration of the service was a mass collaboration platform designed for the digitization of books, particularly those that were too illegible to be Optical character recognition, scanned by computers. The verification prompts utilized pairs of words from scanned pages, with one known word used as a control for verification, and the second used to crowdsourcing, crowdsource the reading of an uncertain word. reCAPTCHA was originally developed by Luis von Ahn, David A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turing Test
The Turing test, originally called the imitation game by Alan Turing in 1949,. Turing wrote about the ‘imitation game’ centrally and extensively throughout his 1950 text, but apparently retired the term thereafter. He referred to ‘ istest’ four times—three times in pp. 446–447 and once on p. 454. He also referred to it as an ‘experiment’—once on p. 436, twice on p. 455, and twice again on p. 457—and used the term ‘viva voce’ (p. 446). See also #Versions, below. Turing gives a more precise version of the question later in the paper: " ese questions reequivalent to this, 'Let us fix our attention on one particular digital computer C. Is it true that by modifying this computer to have an adequate storage, suitably increasing its speed of action, and providing it with an appropriate programme, C can be made to play satisfactorily the part of A in the imitation game, the part of B being taken by a man? is a test of a machine's ability to exhibit intellige ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luis Von Ahn
Luis von Ahn (; born 19 August 1978) is a Guatemalan-American entrepreneur and software developer. He is the founder of the company reCAPTCHA, which was sold to Google in 2009, and the co-founder and CEO of Duolingo. For these projects and others, von Ahn is known as one of the pioneers of crowdsourcing. von Ahn was a professor in the Computer Science Department at Carnegie Mellon University. Early life and education Luis von Ahn was born and raised in Guatemala City. He is of German descent. His mother was one of the first women in Guatemala to complete medical school. She gave birth to von Ahn at age 42, and raised him as a single mother. He attended the American School of Guatemala, a private English-language school in Guatemala City, an experience he cites as a great privilege. When von Ahn was eight years old, his mother bought him a Commodore 64 computer, beginning his fascination with technology and computer science. When he applied to colleges in the United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manuel Blum
Manuel Blum (born 26 April 1938) is a Venezuelan-born American computer scientist who received the Turing Award in 1995 "In recognition of his contributions to the foundations of computational complexity theory and its application to cryptography and program checking". Education Blum was born to a Jewish family in Venezuela. Blum was educated at MIT, where he received his bachelor's degree and his master's degree in electrical engineering in 1959 and 1961 respectively. In MIT, he was recommended to Warren S. McCulloch, and they collaborated on some mathematical problems in neural networks. He obtained a Ph.D. in mathematics in 1964 supervised by Marvin Minsky.. Career Blum worked as a professor of computer science at the University of California, Berkeley until 2001. From 2001 to 2018, he was the Bruce Nelson Professor of Computer Science at Carnegie Mellon University, where his wife, Lenore Blum, was also a professor of computer science. In 2002, he was elected to the Unit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Challenge–response Authentication
In computer security, challenge-response authentication is a family of protocols in which one party presents a question ("challenge") and another party must provide a valid answer ("response") to be authentication, authenticated. The simplest example of a challenge-response protocol is password authentication, where the challenge is asking for the password and the valid response is the correct password. An Adversary (cryptography), adversary who can Network eavesdropping, eavesdrop on a password authentication can authenticate themselves by reusing the intercepted password. One solution is to issue multiple passwords, each of them marked with an identifier. The verifier can then present an identifier, and the prover must respond with the correct password for that identifier. Assuming that the passwords are chosen independently, an adversary who intercepts one challenge-response message pair has no clues to help with a different challenge at a different time. For example, when ot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverse Turing Test
A reverse Turing test is a Turing test in which failure suggests that the test-taker is human, while success suggests the test-taker is automated. Conventionally, the Turing test is conceived as having a few computer AI subjects communicate with each other and one human subject which attempts to also appear as a computer AI. After a few questions the AI subjects needs to correctly guess which of the participants is a human subject. Reversal of objective Arguably the standard form of the reverse Turing test is one in which the subjects attempt to appear to be a computer rather than a human. A formal reverse Turing test follows the same format as a Turing test. Human subjects attempt to imitate the conversational style of a conversation program. Doing this well involves deliberately ignoring, to some degree, the meaning of the conversation that is immediately apparent to a human, and the simulation of the kinds of errors that conversational programs typically make. Arguably un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AI-complete
In the field of artificial intelligence (AI), tasks that are hypothesized to require artificial general intelligence to solve are informally known as AI-complete or AI-hard.Shapiro, Stuart C. (1992)Artificial Intelligence In Stuart C. Shapiro (Ed.), ''Encyclopedia of Artificial Intelligence'' (Second Edition, pp. 54–57). New York: John Wiley. (Section 4 is on "AI-Complete Tasks".) Calling a problem AI-complete reflects the belief that it cannot be solved by a simple specific algorithm. In the past, problems supposed to be AI-complete included computer vision, natural language understanding, and dealing with unexpected circumstances while solving any real-world problem. AI-complete tasks were notably considered useful for testing the presence of humans, as CAPTCHAs aim to do, and in computer security to circumvent brute-force attacks. History The term was coined by Fanya Montalvo by analogy with NP-complete and NP-hard in complexity theory, which formally describes t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Max Levchin
Maksymilian Rafailovych "Max" Levchin (born July 11, 1975) is a Ukrainian-American software engineer and businessman. In 1998, he co-founded the company that eventually became PayPal. Levchin made contributions to PayPal's anti-fraud efforts and was the co-creator of the Gausebeck-Levchin test, one of the first commercial implementations of a CAPTCHA challenge response human test. He founded or co-founded the companies Slide.com, HVF, and Affirm. He was an early investor in Yelp and was their largest shareholder in 2012. He left a leadership role in Yelp in 2015. Levchin was a producer for the movie '' Thank You for Smoking''. Early life and education Born in Kyiv, then part of the Ukrainian SSR, to a Ukrainian-Jewish family, Levchin moved to the United States and settled in Chicago in 1991. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Google
Google LLC (, ) is an American multinational corporation and technology company focusing on online advertising, search engine technology, cloud computing, computer software, quantum computing, e-commerce, consumer electronics, and artificial intelligence (AI). It has been referred to as "the most powerful company in the world" by the BBC and is one of the world's List of most valuable brands, most valuable brands. Google's parent company, Alphabet Inc., is one of the five Big Tech companies alongside Amazon (company), Amazon, Apple Inc., Apple, Meta Platforms, Meta, and Microsoft. Google was founded on September 4, 1998, by American computer scientists Larry Page and Sergey Brin. Together, they own about 14% of its publicly listed shares and control 56% of its stockholder voting power through super-voting stock. The company went public company, public via an initial public offering (IPO) in 2004. In 2015, Google was reorganized as a wholly owned subsidiary of Alphabet Inc. Go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
