The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2025
Filed:
Apr. 02, 2024
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Kazuma Hoshi, Nagoya, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
An electronic control unit is configured to communicate with a different electronic control unit via an in-vehicle network. The electronic control unit includes processing circuitry. The processing circuitry is configured to count a failure count, the failure count indicating a number of times of failure in updating a cryptographic key for performing message authentication with the different electronic control unit, disable an update function of the cryptographic key when the failure count exceeds an upper limit of the failure count, and enable the update function when, in a state in which the update function is disabled, power supply from a power source of the vehicle to the electronic control unit is stopped, and thereafter, power supply from the power source to the electronic control unit is started.