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- W1989960713 abstract "Over the last few years, unfair use of web services by robot software has grown a quite big problem. In order to prevent the robot software from obtaining new accounts of web services, CAPTCHA is popularly used. CAPTCHA is a method which confirms whether a user is a human being or robot software. The most popular CAPTCHA is a method to read distorted letters. However, it is analyzed by computer software according to developing OCR technology. As a countermeasure against the OCR technology, strongly distorted letters for CAPTCHA are proposed. However, it is hard for human beings to read them. Moreover, there appears a new proposal in which movie is used for CAPTCHA with amodal completion which is one of the human abilities for sight. However, if performance of computer is developed, that proposal might become out of use. Therefore, in our proposal, amodal completion is applied to three dimensional objects in order to increase the calculation cost for a computer up to the level of practical use." @default.
- W1989960713 created "2016-06-24" @default.
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- W1989960713 date "2013-01-17" @default.
- W1989960713 modified "2023-09-25" @default.
- W1989960713 title "Proposal of CAPTCHA using three dimensional objects" @default.
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- W1989960713 doi "https://doi.org/10.1145/2448556.2448613" @default.
- W1989960713 hasPublicationYear "2013" @default.
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