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.
Stiltwalker, as the trio dubbed its proof-of-concept attack, exploits weaknesses in the audio version of reCAPTCHA, which is used by Google, Facebook, Craigslist and some 200,000 other websites to confirm that humans and not scam-bots are creating online accounts. While previous hacks have also used computers to crack the Google-owned CAPTCHA (short for Completely Automated Public Turing test to tell Computers and Humans Apart) system, none have achieved Stiltwalker’s impressive success rate — via redwolf.newsvine.com
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