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:
Oct. 14, 2025
Filed:
Jan. 29, 2024
Nuvoton Technology Corporation, Hsinchu Science Park, TW;
Wen-Shuo Chang, Hsinchu, TW;
NUVOTON TECHNOLOGY CORPORATION, Hsinchu Science Park, TW;
Abstract
An electronic device includes an immutable memory, a counter, and a processor. The immutable memory stores a first public key and a second public key in advance, and the first public key and the second public key are unmodifiable. The counter has an anti-rollback protection and counts a counting value. When the counting value is a first value, the processor selects a first public key corresponding to the first value. When the counting value is a second value, the processor selects the second public key corresponding to the second value. When the counting value is a third value, the processor selects the first public key and the second public key. The first value and the second value are in a first state, and the third value is in a second state, where the first state and the second state are different.