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公开(公告)号：US10411904B2
公开(公告)日：2019-09-10
申请号：US15164911
申请日：2016-05-26
Inventor： Manabu Maeda , Natsume Matsuzaki , Motoji Ohmori , Hideki Matsushima , Tomoyuki Haga , Yuji Unagami , Yoshihiro Ujiie
Abstract: A first device, upon detecting participation in an authentication system, transmits new and old identification information of a first certificate revocation list that the first device manages to a second device. In a case where the new and old identification information of a second certificate revocation list that the second device manages is older than the new and old identification information of the received first certificate revocation list, the second device transmits a transmission request for the first certificate revocation list to the first device. Upon receiving the transmission request for the first certificate revocation list from the second device, the first device transmits the first certificate revocation list to the second device. the second device updates the second certificate revocation list using the received first certificate revocation list.
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公开(公告)号：US10404453B2
公开(公告)日：2019-09-03
申请号：US15400031
申请日：2017-01-06
Inventor： Yuji Unagami , Manabu Maeda , Hideki Matsushima , Tomoki Takazoe , Yoichi Masuda
Abstract: At least one controller in a group selects a coordinator that manages a group key to be used in common in the group from among controllers in the group in accordance with an attribute of the controllers. The selected coordinator generates a group key, performs mutual authentication with devices and the controllers in the group, and shares the generated group key with devices and controllers that have been successfully authenticated. The coordinator then generates encrypted data and authentication data by using the group key and simultaneously broadcasts a message including the encrypted data and the authentication data.
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