BaffleText: a human interactive proof

  title={BaffleText: a human interactive proof},
  author={Monica Chew and Henry S. Baird},
Internet services designed for human use are being abused by programs. We present a defense against such attacks in the form of a CAPTCHA (completely automatic public Turing test to tell computers and humans apart) that exploits the difference in ability between humans and machines in reading images of text. CAPTCHAs are a special case of ‘human interactive proofs,’ a broad class of security protocols that allow people to identify themselves over networks as members of given groups. We point… CONTINUE READING
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