Web developers have taken the idea of Captchas – challenge-response systems that are often used to stop the automatic creation of webmail accounts by spammers – forward in a fun way by using images of kittens instead of distorted images of letters. KittenAuth features nine pictures of cute little animals, only three of which are feline. A user demonstrates that there’s a human in front of machine by selecting the three kittens among these images.

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