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Patent Agency Ranking
公开(公告)号：US10951400B2
公开(公告)日：2021-03-16
申请号：US16511293
申请日：2019-07-15
Inventor： Yuji Unagami , Manabu Maeda , Hideki Matsushima , Tomoki Takazoe , Yoichi Masuda
Abstract: An authentication method for a group of devices connected to a network includes selecting the first controller as a coordinator, the coordinator being configured to manage a group key to be used in common in the group. The method includes generating the group key, and performing first mutual authentication and second mutual authentication. The method also includes sharing the group key with each device for which the first mutual authentication has been successful, and sharing the group key with each second controller for which the second mutual authentication has been successful. The method further includes encrypting transmission data by using the group key to generate encrypted data, generating, authentication data by using the group key, and simultaneously broadcasting a message to each device for which the first mutual authentication has been successful and each second controller for which the second mutual authentication has been successful.
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公开(公告)号：US10764275B2
公开(公告)日：2020-09-01
申请号：US15753148
申请日：2016-08-04
Inventor： Tomoki Takazoe , Yoichi Masuda , Hideki Matsushima , Yuji Unagami
Abstract: A new controller (supporting device authentication) is a controller which performs encrypted communication with a device which has succeeded in mutual authentication using an electronic certificate, and the controller includes: a determining unit that determines whether or not a communication target device with which communication is to be performed is an authentication support device that supports the mutual authentication; a functional restriction unit that, when the communication target device is determined not to be the authentication support device by the determining unit, imposes a functional restriction on one or more functions of the communication target device which are operable by the new controller (supporting device authentication); and a communication unit which performs communication in plain text with the communication target device with the functional restriction imposed by the functional restriction unit.
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公开(公告)号：US10609027B2
公开(公告)日：2020-03-31
申请号：US15322279
申请日：2015-05-27
Inventor： Yoichi Masuda , Tomoki Takazoe , Manabu Maeda , Yuji Unagami
Abstract: A communication system, including: a NW management device which (i) forms a network together with an authenticated target device, and (ii) manages the network by delivering a session key for use in communication in the network to the authenticated target device; and a device authenticated by the NW management device, wherein the NW management device: determines whether or not to permit the device to be an alternative management device which manages the network in replace of the NW management device when communication is impossible in the network; shares, with the device, authentication information about the authenticated target device, when permitting the device to be the alternative management device; and the device shares the authentication information with the NW management device, and starts managing the network using the authentication information as the alternative management device when determining that the NW management device cannot communicate in the network.
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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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公开(公告)号：US09642100B2
公开(公告)日：2017-05-02
申请号：US14773598
申请日：2014-02-21
Inventor： Naotake Yamamoto , Yoichi Masuda , Tetsuya Hishikawa
CPC classification number: H04W52/42 , H04B7/0608 , H04B7/061 , H04W4/70 , H04W52/367 , Y02D70/00
Abstract: A wireless communication device has an aim of specifying, when transmitting data to another communication device, an antenna among antennas that can transmit data at a low transmission power. The wireless communication device switches between a first antenna and a second antenna upon transmission of a request signal to the other communication device, and increases or decreases transmission power for transmitting the request signal when switching between the first antenna and the second antenna.
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