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Animated ink-blot images keep unwanted bots at bay

发布时间:2017-04-16 06:01:10来源:未知点击:

By Colin Barras THREE animals lurk in the image to the right. Your ability to pick them out might just be proof that you are a living, breathing human. Such proof is highly prized online, where website operators strive to distinguish between human visitors and unwelcome software bots. That distinction has so far been made using distorted patterns of letters, called captchas, which are legible to humans but indecipherable to most bots. As bots have become more sophisticated, though, captchas have become more fiendish, making them tricky for even the most gimlet-eyed human,