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Google Enhances CAPTCHAs Made Easier for Humans and Harder for Bots
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msg:4619149
 10:21 pm on Oct 25, 2013 (gmt 0)

The updated system uses advanced risk analysis techniques, actively considering the user’s entire engagement with the CAPTCHA—before, during and after they interact with it. That means that today the distorted letters serve less as a test of humanity and more as a medium of engagement to elicit a broad range of cues that characterize humans and bots.

As part of this, we’ve recently released an update that creates different classes of CAPTCHAs for different kinds of users. This multi-faceted approach allows us to determine whether a potential user is actually a human or not, and serve our legitimate users CAPTCHAs that most of them will find easy to solve. Bots, on the other hand, will see CAPTCHAs that are considerably more difficult and designed to stop them from getting through.
Google Enhances CAPTCHAs Made Easier for Humans and Harder for Bots [googleonlinesecurity.blogspot.com]

 

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