Instruct: Given a question, retrieve relevant documents that can help answer the question.
Query: Who developed Recaptcha?
The project was started at the end of 2009 in Pittsburgh by Carnegie Mellon University professor Luis von Ahn (creator of reCAPTCHA) and his graduate student Severin Hacker, and then developed along with Antonio Navas, Vicki Cheung, Marcel Uekermann, Brendan Meeder, Hector Villafuerte, and Jose Fuentes.
Aaron Greenspan created a web portal as a Harvard undergraduate called houseSYSTEM that launched in August 2003. In February 2004, when thefacebook.com launched, Greenspan recognized aspects of his own work in the site, and later came to believe that Zuckerberg was copying his work one feature at a time—a claim that Zuckerberg denied. Regarding Greenspan's allegations, Zuckerberg was described in "The New York Times" as "saying through a spokeswoman that he was not sure how to respond". Greenspan's company filed a Petition to Cancel the "Facebook" trademark, which included claims of prior use and fraud by Facebook, Inc. against the USPTO. Facebook, Inc. agreed to a formal settlement with Greenspan in late May 2009 and issued a press release, but the terms were not disclosed.
Brian Acton (born February 17, 1972) is an American computer programmer and Internet entrepreneur. He is the co-founder (with Jan Koum) of WhatsApp, a mobile messaging application which was acquired by Facebook Inc. in February 2014 for US$19 billion. He was formerly employed at Yahoo Inc. In September 2017, Acton announced that he was leaving WhatsApp to start a foundation. On February 21, 2018, Acton and Moxie Marlinspike announced the formation of the Signal Foundation.
In August 2007, a tool called WikiScanner—developed by Virgil Griffith, a visiting researcher from the Santa Fe Institute in New Mexico—was released to match edits to the encyclopedia by non-registered users with an extensive database of IP addresses. News stories appeared about IP addresses from various organizations such as the Central Intelligence Agency, the National Republican Congressional Committee, the Democratic Congressional Campaign Committee, Diebold, Inc. and the Australian government being used to make edits to Wikipedia articles, sometimes of an opinionated or questionable nature. Another story stated that an IP address from the BBC itself had been used to vandalize the article on George W. Bush. The BBC quoted a Wikipedia spokesperson as praising the tool: "We really value transparency and the scanner really takes this to another level. Wikipedia Scanner may prevent an organisation or individuals from editing articles that they're really not supposed to." Not everyone hailed WikiScanner as a success for Wikipedia. Oliver Kamm, in a column for "The Times", argued instead that:
In the late 1980s, Berners-Lee, then a scientist at CERN, invented the World Wide Web to meet the demand for simple and immediate information-sharing among physicists working at CERN and different universities or institutes all over the world.
The word "algorithm" itself derives from the 9th century mathematician Muḥammad ibn Mūsā al-Khwārizmī, Latinized "Algoritmi". A partial formalization of what would become the modern concept of algorithm began with attempts to solve the Entscheidungsproblem (decision problem) posed by David Hilbert in 1928. Later formalizations were framed as attempts to define "effective calculability" or "effective method". Those formalizations included the Gödel–Herbrand–Kleene recursive functions of 1930, 1934 and 1935, Alonzo Church's lambda calculus of 1936, Emil Post's Formulation 1 of 1936, and Alan Turing's Turing machines of 1936–37 and 1939.
The World Wide Web, also known as the WWW and the Web, is an information space where documents and other web resources are identified by Uniform Resource Locators (URLs), interlinked by hypertext links, and accessible via the Internet. English scientist Tim Berners-Lee invented the World Wide Web in 1989. He wrote the first web browser in 1990 while employed at CERN near Geneva, Switzerland. The browser was released outside CERN in 1991, first to other research institutions starting in January 1991 and to the general public on the Internet in August 1991.
The World Wide Web Worm (WWWW) was one of the earliest search engines for the World Wide Web (WWW). It is claimed by some to be the first search engine, though it was not released until March 1994, by which time a number of other search engines had been made publicly available. It was developed in September 1993 by Oliver McBryan at the University of Colorado as a research project.
Facebook is a social networking service launched in July 2003, as FaceMash, later changing to TheFacebook on February 4, 2004. It was founded by Mark Zuckerberg with his college roommate and fellow Harvard University student Eduardo Saverin. The website's membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area, the Ivy League, and gradually most universities in the United States and Canada, corporations, and by September 2006, to everyone with a valid email address along with an age requirement of being 13 and older.
FaceMash, Facebook's predecessor, opened in 2003. Developed by Mark Zuckerberg, he wrote the software for the Facemash website when he was in his second year of college. The website was set up as a type of "hot or not" game for Harvard students. The website allowed visitors to compare two female student pictures side-by-side and let them decide who was hot or not.
The client was created by WhatsApp Inc., based in Mountain View, California, which was acquired by Facebook in February 2014 for approximately US$19.3 billion. By February 2018, WhatsApp had a user base of over one and a half billion, making it the most popular messaging application at the time. WhatsApp has grown in multiple countries, including Brazil, India, and large parts of Europe, including the United Kingdom and France.
Ivan Pope (1961-) is a British technologist who was involved with a number of early internet developments in the UK and across the world, and invented the "cybercafe" at London's Institute of Contemporary Arts. He was a founder of two of the first internet magazines, The World Wide Web Newsletter, and later .net magazine in the UK. In 1994 he founded Webmedia to professionalise the process of web site design and build. In 1995 he was involved with the creation of the domain name management company NetNames. Pope is now a writer and a noted proponent of the dérive.
Hotmail service was founded by Sabeer Bhatia and Jack Smith, and was one of the first webmail services on the Internet along with Four11's RocketMail (later Yahoo! Mail). It was commercially launched on July 4, 1996, symbolizing "freedom" from ISP-based email and the ability to access a user's inbox from anywhere in the world. The name "Hotmail" was chosen out of many possibilities ending in "-mail" as it included the letters HTML, the markup language used to create web pages (to emphasize this, the original type casing was "HoTMaiL"). The limit for free storage was 2 MB. Hotmail was initially backed by venture capital firm Draper Fisher Jurvetson. By December 1997, it reported more than 8.5 million subscribers. Hotmail initially ran under Solaris for mail services and Apache on FreeBSD for web services, before being partly converted to Microsoft products, using Windows Services for UNIX in the migration path.
Netscape Communications created HTTPS in 1994 for its Netscape Navigator web browser. Originally, HTTPS was used with the SSL protocol. As SSL evolved into Transport Layer Security (TLS), HTTPS was formally specified by RFC 2818 in May 2000.
PopCap Games was founded by John Vechey, Brian Fiete and Jason Kapalka in 2000. They wanted to create games, primarily by learning from other Internet gaming sites. Their first game was "Bejeweled", a gem-swapping game, which was supported on all major platforms and awarded by Computer Gaming World Hall Of Fame in 2002. The company expanded in 2005 with the acquisition of Sprout Games, a Seattle-based casual games developer company like PopCap Games, founded by James Gwertzman. Sprout Games is the creator of the game "Feeding Frenzy". The Sprout team helped PopCap to make a sequel to the game, "", with Gwertzman becoming the Director of Business Development at PopCap. In early 2006, PopCap International was opened, based in Dublin, Ireland, working on product localization, mobile games development, marketing, sales and business development.
In December 2007, SRI launched a spin-off company, Siri Inc., which Apple acquired in April 2010. In October 2011, Apple announced the Siri personal assistant as an integrated feature of the Apple iPhone 4S. Siri's technology was born from SRI's work on the DARPA-funded CALO project, described by SRI as the largest artificial intelligence project ever launched. Siri was co-founded in December 2007 by Dag Kittlaus (CEO), Adam Cheyer (vice president, engineering), and Tom Gruber (CTO/vice president, design), together with Norman Winarsky (vice president of SRI Ventures). Investors included Menlo Ventures and Morgenthaler Ventures.
Development of the GitHub platform began on October 19, 2007. The site was launched in April 2008 by Tom Preston-Werner, Chris Wanstrath, P. J. Hyett and Scott Chacon after it had been made available for a few months prior as a beta release.
GitHub.com was a start-up business, which in its first years provided enough revenue to be funded solely by its three founders and start taking on employees. In July 2012, four years after the company was founded, Andreessen Horowitz invested $100 million in venture capital. In July 2015 GitHub raised another $250 million of venture capital in a series B round. Investors were Sequoia Capital, Andreessen Horowitz, Thrive Capital and other venture capital funds. As of August 2016, GitHub was making $140 million in Annual Recurring Revenue.
In the summer of 1993, no search engine existed for the web, though numerous specialized catalogues were maintained by hand. Oscar Nierstrasz at the University of Geneva wrote a series of Perl scripts that periodically mirrored these pages and rewrote them into a standard format. This formed the basis for W3Catalog, the web's first primitive search engine, released on September 2, 1993.
The first one-way encryptions were likely developed by James H. Ellis, Clifford Cocks, and Malcolm Williamson at the UK intelligence agency GCHQ during the 1960s and 1970s and were published independently by Diffie and Hellman in 1976 (History of cryptography). Common modern one-way encryption algorithms, including MD5 (message digest) and SHA-512 (secure hash algorithm) are similar to the first such algorithms in that they also contain no mechanism to disclose the original data. The output of these modern one-way encryptions offer high privacy but are not homomorphic, meaning that the results of the one-way encryptions do not allow high order math operations (such as match). For example, we cannot use two SHA-512 sums to compare the closeness of two encrypted documents. This limitation makes it impossible for these one-way encryptions to be used to support classifying models in machine learning—or nearly anything else.
PopCap began another round of expansion in July 2007 by buying other casual game developers including the creators of an online consumer portal, SpinTop Games. One week prior, the company acquired the Chicago-based development house Retro64, founded by Mike Boeh, which is best known for their retro-arcade action and puzzle titles. After these acquisitions, the PopCap logo was rebranded, dropping the "Games" portion. PopCap's premium games list on their website are mixed with other games from other developers/distributors.
The series was announced on 10 July 2009, under the working title of "Digital Revolution", to examine the impact the World Wide Web has had on society over its first 20 years. Technology journalist and academic Aleks Krotoski would present. The series was launched with an event at the BBC to mark the twentieth anniversary of the World Wide Web, which saw Tim Berners-Lee (credited with inventing the World Wide Web), Susan Greenfield, Bill Thompson and Chris Anderson discuss the World Wide Web.
In 2007, von Ahn invented reCAPTCHA, a new form of CAPTCHA that also helps digitize books. In reCAPTCHA, the images of words displayed to the user come directly from old books that are being digitized; they are words that optical character recognition could not identify and are sent to people throughout the web to be identified. ReCAPTCHA is currently in use by over 100,000 web sites and is transcribing over 40 million words per day.
reCAPTCHA is also a barrier to Internet use in areas of the world where there is heavy Internet censorship and the underlying enabling sites are blocked.
Software engineer Andrew Munsell, in his article "Captchas Are Becoming Ridiculous" states "A couple of years ago, I don’t remember being truly baffled by a captcha. In fact, reCAPTCHA was one of the better systems I’d seen. It wasn’t difficult to solve, and it seemed to work when I used it on my own websites." Munsell goes on to state, after encountering a series of unintelligible images that despite refreshing "Again, and again, and again. The captchas were not only difficult for a computer to read, but impossible for a human." Munsell then provided numerous examples.
"We designed the building from the inside out, not the outside in,” said Loretta H. Cockrum, Foram’s founder, chairman and CEO. “We wanted the most efficient office building ever designed, with no wasted space or wasted energy. This is a building of the future more than a building of the present. A lot of love has gone into that building, and a lot of pride."
In October 2013, artificial intelligence company Vicarious claimed that it had developed a generic CAPTCHA-solving algorithm that was able to solve modern CAPTCHAs with character recognition rates of up to 90%. However, Luis von Ahn, a pioneer of early CAPTCHA and founder of reCAPTCHA, expressed skepticism, stating: "It's hard for me to be impressed since I see these every few months." He pointed out that 50 similar claims to that of Vicarious had been made since 2003.