Last weekend a chemical group of hackers unveil Stiltwalker , a hack that subverts the reCaptcha system Google uses to protect its services from botswith 99 percentage accuracy . But just hours before the grouping was specify to present their hack at theLayerOne conferenceGoogle patched it up so it would n’t work anymore .
Stiltwalker is an impressive piece of engine room by the cyberpunk fromDefcon Group . CAPTCHA hack writer have existed before , but what makes this drudge so neat is that when it was work it could boom Google ’s put one over organisation much more accurately than any other before it . Rather than round a exclusive exposure , the hackers attacked several shortcomings of the audio dowry of the audio version of reCAPTCHA from multiple angle . Ars Technicareports :
What the hackers - identified only as C - P , Adam , and Jeffball - learned from analyze the sound print of each trial run was that the screen background noise , in sharp contrast to the six words , did n’t include sounds that register at higher frequencies . By plat the frequency of each audio psychometric test on a spectogram , the cyberpunk could easy isolate each tidings by locating the regions where high pitch were mapped . reCAPTCHA was also undermine by its manipulation of just 58 unique Word . Although the inflection , pronunciations , and sequences of spoken word diverge significantly from mental testing to try , the little corpus of intelligence greatly reduced the work it took a computing machine to greet each utterance .
The group has said they ’re already working on a way to get past Google ’s new system . [ Defcon GroupviaArs Technica ]
double by Dirtbag /Blackhatworld
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