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audio_captcha [2010/01/28 00:00]
audio_captcha [2010/01/28 12:00]
nishimotz
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 +====== Audio Captcha ======
  
 +Notice: this is a draft of unpublished working paper by Takuya Nishimoto.
 +
 +Part of the work is published in Japanese.
 +
 +===== References =====
 +
 +  * Luis von Ahn, Benjamin Maurer, Colin McMillen, David Abraham, Manuel Blum. "​reCAPTCHA:​ Human-Based Character Recognition via Web Security Measures,"​ SCIENCE, VOL 321, 12, 1465, Sept 2008.
 +  * Inaccessibility of CAPTCHA, Alternatives to Visual Turing Tests on the Web, W3C Working Group Note 23 November 2005. http://​www.w3.org/​TR/​turingtest/​
 +  * Jennifer Tam, Jiri Simsa, Sean Hyde, Luis Von Ahn: "​Breaking Audio CAPTCHAs,"​ Proc. of NIPS, 2008.
 +
 + 
 +===== Introduction =====
 +
 +CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart) are popular security techniques on the World Wide Web that prevent automated programs from abusing online services.
 +
 +A typical CAPTCHA is an image containing several distorted characters that appears at the Web forms.
 +
 +Users are asked to type the distorted dirty characters to let the system know that they are human.
 +
 +Image-based CAPTCHAs are, however, preventing Web use of persons with visual disability.
 +Audio CAPTCHAs were created to solve this accessibility issue.
 +
 +Within the CAPTCHA tasks, the difference of recognition performance between human and machine can be used as a criterion of the safeness.
 +
 +Viewied from another side, mental workload for human in listening audio CAPTCHA tasks has not been investigated very much.
 +
 +Design method of CAPTCHA task in consideration of safety and ease-of-use is described in this paper.
audio_captcha.txt ยท Last modified: 2010/01/28 00:00 (external edit)
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