看到 Tsung 這篇 破解 圖片辨識, 才知道用程式(PWNtcha - captcha decoder)來解讀 Captcha,
已有很高的辨識率, 大部份 Captcha 的弱點都是: 固定字型、固定位置、沒有顏色變化.
相反地, 若具有多種字型、變換位置、背景與字型有顏色變化, 就是好的 Captcha,
不過太過困難的 Captcha 有時連人也很難辨識, 像微軟 Passport 用的:
還好目前作者尚未釋出 Source Code.
PWNtcha - captcha decoder
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This page contains a single entry by Pank published on May 24, 2006 9:07 AM.
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