Kenjiro Kai

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Terrestrial digital broadcasting that uses the ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) system is scheduled for launch in Japan in December 2003. This system also enables mobile broadcasting service, which will be offered a few years later. We are developing a Location-Aware Data Broadcasting Service as a remarkably new type of(More)
Many kinds of ciphertext-policy attribute-based encryption (CP-ABE) schemes have been proposed. In CP-ABE, the set of user attributes is associated with his/her secret key whereas a policy is associated with a ciphertext so that only users whose attributes satisfy the policy can decrypt the ciphertext. CP-ABE may be applied to a variety of services such as(More)
In this paper we describe a method that transforms data broadcast contents on the receiver side into various formats fitting different user interfaces. The method performs accurate transformations by utilizing the fact that most data broadcast contents have a pattern derived from the template used in the broadcaster's production process. The method can also(More)
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