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:
Jul. 09, 2024
Filed:
Sep. 10, 2021
Kabushiki Kaisha Toshiba, Tokyo, JP;
Mikio Hashimoto, Bunkyo Tokyo, JP;
Atsushi Shimbo, Bunkyo Tokyo, JP;
Shinnosuke Yamaoka, Fuchu Tokyo, JP;
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
Abstract
An electronic apparatus includes a controller. The controller includes an instruction executer configured to generate or acquire data, an issuer configured to accept a request and issues a time stamp, a first updater configured to update a first counter value according to a first operation, a second updater configured to update a second counter value in accordance with issuance of the time stamp, a first non-volatile memory to hold the first counter value and a secret key, and a volatile register to hold the second counter value. The time stamp is a message authentication code or a digital signature issued from the first and second counter values and the data. The second counter value is not stored in the first non-volatile memory.