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).