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Introduction Virtually every dynamic site on the Internet these days makes use of a CAPTCHA in some fashion. A CAPTCHA is used to verify that a human is driving the interaction with a particular  function on a site. A CAPTCHA in its simplest form involves an end-user copying the text from an image to a text field. If the user-entered text matches that of the image, the user is allowed access to the requested resource. Variations to the classic CAPTCHA can involve doing simple math, solving ...
  

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