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Get a Free CAPTCHA For Your Site ... The reCAPTCHA project at Carnegie Mellon University offers a free, secure and easy to install CAPTCHA implementation. reCAPTCHA also channels the human effort spent solving CAPTCHAs into helping to digitize books from the Internet Archive.
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Maintainers for CAPTCHA ... A CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human. The purpose of CAPTCHA is to block form submissions by spambots, which are automated scripts that post spam content everywhere they can.
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CAPTCHA - Wikipedia, the free encyclopedia
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A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot. For example, humans can read distorted text as the one shown below, but current computer programs can't:
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A history of how CAPTCHA has been adopted over the years is instructive. Larger sites adopted CAPTCHA because their resources were easy to abuse for the purposes of sending spam or conducting anonymous, illegal activity.
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Free CAPTCHA-Service ... A CAPTCHA image shows a random string which the user has to type to submit a form. This is a simple problem for (seeing) humans, but a very hard problem for computers which have to use character recognition, especially, because the displayed string is alienated in a way, which makes it very hard for...
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Another Captcha, called Sounds, consists of a distorted, computer-generated sound clip containing a word or sequence of numbers. To solve the puzzle, a user must listen to the clip and type the word or numbers into the box provided.
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A CAPTCHA is a program that can generate and grade tests that: ... CAPTCHA stands for "Completely Automated Public Turing test to Tell Computers and Humans Apart". See the CAPTCHA site for more details. The concept of a CAPTCHA is motivated by real-world problems faced by internet companies such as Yahoo! and AltaVista.
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