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CAPTCHA: Using Hard AI Problems For Security Luis von Ahn1 , Manuel Blum1 , Nicholas J. Hopper1 , and John Langford2 1 Computer Science Dept., Carnegie Mellon University, Pittsburgh PA 15213, USA
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Document Date: 2003-02-27 12:07:03
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File Size: 180,52 KB
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CAPTCHA: Using Hard AI Problems For Security Luis von Ahn1 , Manuel Blum1 , Nicholas J. Hopper1 , and John Langford2 1 Computer Science Dept., Carnegie Mellon University, Pittsburgh PA 15213, USA