The Decline of the CAPTCHA
The concept of using CAPTCHA tests to defeat automated attacks is reaching the end of its useful life. This is what we get for taking Alan Turing's name in vain. The 'T' in CAPTCHA is for Turing and his famous proposition that a machine could be said to be called "sentient" when a person out of view talking to it could not tell if it were human or machine.
The goal of a CAPTCHA, or Completely Automated Public Turing test to tell Computers and Humans Apart, is to present a challenge that only a human can answer properly. It took a few years, but it looks like computers are getting to the point of defeating CAPTCHAs often enough to make the tests a failure. The Decline of the CAPTCHA
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