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===== Introduction ===== | ===== Introduction ===== | ||
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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. | 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. | ||
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Image-based CAPTCHAs are, however, preventing Web use of persons with visual disability. | Image-based CAPTCHAs are, however, preventing Web use of persons with visual disability. | ||
+ | Audio CAPTCHAs were created to solve this accessibility issue. | ||
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+ | Within the CAPTCHA tasks, the difference of recognition performance between human and machine can be used as a criterion of the safeness. | ||
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+ | Viewied from another side, mental workload for human in listening audio CAPTCHA tasks has not been investigated very much. | ||
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+ | Design method of CAPTCHA task in consideration of safety and ease-of-use is described in this paper. | ||
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