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:
Aug. 02, 2022
Filed:
Nov. 07, 2019
Information processing apparatus capable of detecting software tampering and control method therefor
Canon Kabushiki Kaisha, Tokyo, JP;
Takeshi Aoyagi, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An information processing apparatus includes a verification unit that performs verification of software to be executed by an execution unit, a retaining unit that retains information indicating a voltage supposed to be applied to the execution unit, a power supply unit that applies a predetermined voltage to the execution unit on the basis of the information, and a clock signal output unit that outputs clock signals having frequencies, and the clock signal output unit outputs a clock signal having a first frequency to the verification unit when verification of the software is performed, outputs a clock signal having a second frequency lower than the first frequency to the execution unit before the predetermined voltage is applied to the execution unit, and outputs a clock signal having a third frequency higher than the second frequency to the execution unit after the predetermined voltage is applied to the execution unit.