公开(公告)号：US20190342086A1

公开(公告)日：2019-11-07

申请号：US16511293

申请日：2019-07-15

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Yuji UNAGAMI ,  Manabu MAEDA ,  Hideki MATSUSHIMA ,  Tomoki TAKAZOE ,  Yoichi MASUDA

IPC: H04L9/08 ,  H04Q9/00 ,  G06F21/44 ,  H04L29/06 ,  H04L9/06 ,  H04L9/32

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.

公开(公告)号：US20190386989A1

公开(公告)日：2019-12-19

申请号：US16552445

申请日：2019-08-27

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Yuji UNAGAMI ,  Manabu MAEDA ,  Tomoki TAKAZOE ,  Yoichi MASUDA ,  Hideki MATSUSHIMA

IPC: H04L29/06 ,  H04L9/32 ,  H04L9/30 ,  H04L9/14

Abstract: A first controller generates a first group key, executes first mutual authentication with devices within a group, and shares the first group key with the devices that have succeeded in first mutual authentication. When a second controller joins the group, the first controller decides a coordinator that manages a group key used in common in the group. The first controller executes second mutual authentication with the coordinator, and shares the first group key with the coordinator when the second mutual authentication is successful. The coordinator performs encrypted communication within the group using the first group key, generates a second group key when valid time of the first group key is equal to or smaller than a predetermined value, executes third mutual authentication with the devices and a third controller, and updates the first group key of the devices and the third controller that have succeeded in the third authentication.

公开(公告)号：US20170142104A1

公开(公告)日：2017-05-18

申请号：US15322279

申请日：2015-05-27

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yoichi MASUDA ,  Tomoki TAKAZOE ,  Manabu MAEDA ,  Yuji UNAGAMI

IPC: H04L29/06 ,  H04L29/08

CPC classification number: H04L63/0869 ,  G06F21/305 ,  G06F21/44 ,  H04L9/083 ,  H04L9/0891 ,  H04L9/3273 ,  H04L63/0823 ,  H04L67/146

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.

公开(公告)号：US20240214188A1

公开(公告)日：2024-06-27

申请号：US18557868

申请日：2022-04-12

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masaya YAMAMOTO ,  Koji OKUNO ,  Manabu MAEDA ,  Yuji UNAGAMI

IPC: H04L9/08

CPC classification number: H04L9/0841

Abstract: The information processing method according to the present disclosure is for a device, and allows for sharing, between a home-appliance main microcontroller (13) and a communication module (11), a shared key that is an encryption key of a common-key cryptosystem for protecting a communication path (12) between the home-appliance main microcontroller (13) and the communication module (11). The information processing method includes: holding, by the home-appliance main microcontroller (13), a first shared key; detecting, by the communication module (11), a mismatch between a first message authentication code added to encrypted data obtained from the home-appliance main microcontroller (13) through the communication path and a second message authentication code calculated from the encrypted data; and when the mismatch is detected in the detecting, sharing the first shared key between the home-appliance main microcontroller (13) and the communication module (11) by the communication module (11) obtaining the first shared key from the home-appliance main microcontroller (13).