在 Boing Boing 看到對抗 CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) 的軟體：PWNTCHA: defeating CAPTCHAs with software。
在官方網頁 PWNtcha – captcha decoder 裡就分析了目前常見到的 CAPTCHA 辨識率… (Quite Interesting :p)
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