人類の時間を無駄遣いするCAPTCHAの代替技術。Cloudflareが無償提供
Google's reCAPTCHA briefly cracked - The H Security: News and Features
A tough nut to crack - the text version of reCAPTCHA requires users to enter words from scanned books Hackers developed a script which was able to crack Google's reCAPTCHA system with a success rate of better than 99 per cent. They presented the results of their research at the LayerOne security conference in Los Angeles last weekend; however, their demonstration was somewhat frustrated as, just a
Defcon Group 949
Stiltwalker: Nucaptcha, Paypal, SecurImage, Slashdot, Davids Summer Communication Please review v1, v2, and v3 before continuing. We gave a talk on all of our changes since round 1 at BsidesLV 2012. You can grab the slides here (or here for a tarball containing the demo videos and mp3s) and watch the video below. So we figured since we can't solve any recaptchas manually, we might as well go after
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人工知能の進化で変形文字「CAPTCHA」が解除可能に | スラド セキュリティ
Googleが「CAPTCHA」を改良、リスク分析により人間と機械を区別 
創り出すためのアウトライン・プロセッサ 『カケラの樹』
