June 2003
Excuse Me, Are You Human?
Anti-spam schemes that force people to prove they aren't machines won't work.
By Simson Garfinkel
If you have signed up for an e-mail account recently, you may have been forced to do something quite demeaning: prove that you are a human being. It's all part of the multipronged war being waged against purveyors of unsolicited e-mail, or spam. But this is one weapon that would best be abandoned.
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Massachusetts Institute of Technology