05/31/2012 09:45 am ET Updated Jun 01, 2012

How A Trio Of Hackers Brought Google's reCAPTCHA To Its Knees

Google revamped its reCAPTCHA system, used to block automated scripts from abusing its online services, just hours before a trio of hackers unveiled a free system that defeats the widely used challenge-response tests with more than 99 percent accuracy.

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