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re CAPTCHA is a CAPTCHA-like system designed to establish that a computer user is human (normally in order to protect websites from bots) and, at the same time, assist in the digitization of books.
Also, the control word might mislead context for the second word, such as a request of "/metal/ /fife/" being entered as "metal file" due to the logical connection of filing with a metal tool being considered more common than the musical instrument "fife".Google released a new version of re CAPTCHA just hours before their talk, making major changes to both the audio and visual versions of their service.In this release, the audio version was increased in length from 8 seconds to 30 seconds, and is much more difficult to understand, both for humans as well as bots.The use of re CAPTCHA has been labelled "a serious barrier to internet use" for people with sight problems or disabilities such as dyslexia by a BBC journalist.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.According to former Google "click fraud czar" Shuman Ghosemajumder, this capability "creates a new sort of challenge that very advanced bots can still get around, but introduces a lot less friction to the legitimate human." The re CAPTCHA tests are displayed from the central site of the re CAPTCHA project, which supplies the words to be deciphered.
This is done through a Java Script API with the server making a callback to re CAPTCHA after the request has been submitted.Their respective outputs are then aligned with each other by standard string-matching algorithms and compared both to each other and to an English dictionary.Any word that is deciphered differently by both OCR programs or that is not in the English dictionary is marked as "suspicious" and converted into a CAPTCHA.If enough users were to correctly type the control word, but incorrectly type the second word which OCR had failed to recognize, then the digital version of documents could end up containing the incorrect word.The identification performed by each OCR program is given a value of 0.5 points, and each interpretation by a human is given a full point.On 14 December 2009, Jonathan Wilkins released a paper describing weaknesses in re CAPTCHA that allowed a solve rate of 18%.