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The CAPTCHAs that are used as combinations of numbers or letters on pictures which a visitor has to re-enter in a text box to prove they are not an AI, actually stand for Completely Automated Public Turing test to tell Computers and Humans Apart.

They are essentially a highly simplified Turing test designed to present a task that humans are usually capable of achieving, and AIs can not. This is also why CAPTCHA methods keep changing. Each time AI overcomes one method of segregation, another must be devised.

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Researchers have developed an automated system for creating still and video images that can be identified by humans but not by computers. Such technology could be useful for Captcha systems, which were designed to keep "spambots"--or auto...

In the battle to beat the spambots, a new weapon has been developed that exploits the difficulty that computers have with recognizing joined-up handwriting. The hope is that switching from text-based verification systems to systems that use...