This shows you the differences between two versions of the page.
Previous revisionNext revision | |||
— | audio_captcha [2010/01/28 11:59] – nishimotz | ||
---|---|---|---|
Line 1: | Line 1: | ||
+ | ====== Audio Captcha ====== | ||
+ | Notice: this is a draft of unpublished working paper by Takuya Nishimoto. | ||
+ | |||
+ | ===== References ===== | ||
+ | |||
+ | * Luis von Ahn, Benjamin Maurer, Colin McMillen, David Abraham, Manuel Blum. " | ||
+ | * Inaccessibility of CAPTCHA, Alternatives to Visual Turing Tests on the Web, W3C Working Group Note 23 November 2005. http:// | ||
+ | * Jennifer Tam, Jiri Simsa, Sean Hyde, Luis Von Ahn: " | ||
+ | |||
+ | |||
+ | ===== 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. |