Carnegie Mellon University professor Luis von Ahn, a pioneer in captcha development, is featured in a recent New York Times article.
Various types of visual and audio captchas -- short for “completely automated public Turing test to tell computers and humans apart,” a reference to the test proposed by Alan Turing, the British mathematician, to determine if a computer can be said to think like a human -- help websites block abuse that includes spam e-mail, illegal postings and skewed online voting.
In addition to creating a new, secure form of audio captcha, Dr. von Ahn has also created a free system, called reCaptcha (recaptcha.net), now used by about 120,000 sites including Ticketmaster, Craigslist, Facebook, Twitter and The New York Times.
Read the complete article
here.
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