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| audio_captcha [2010/01/28 11:01] – nishimotz | audio_captcha [2010/01/28 11:45] – nishimotz | ||
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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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