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CAPTCHA 驗證碼

這是成大選課系統1的圖形驗證碼2
mm…很好OCR的感覺…真的有效嗎? :D

  1. Breaking a Visual CAPTCHA
  2. OCR Research Team
  3. PWNtcha – captcha decoder

��碼02
��碼01

20060904補充:

  • 剛剛上去看,奇妙的瀏覽器判斷不見了
  • 驗證碼變得更簡單了…
  • 順便看一下submit那段程式碼…用了SHA1…mm..不如直接走SSL啊…

  1. 成大選課系統,只限制IE,裡面有神奇的JavaScript判斷,navigator.appVersion.indexOf(‘MSIE’),其他瀏覽器進去會有無窮環圈 :D []
  2. http://course.ncku.edu.tw/course/img.php []
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