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:
Nov. 21, 2023
Filed:
Nov. 29, 2021
Applicant:
Stmicroelectronics (Rousset) Sas, Rousset, FR;
Inventors:
Thomas Ordas, Pourcieux, FR;
Yanis Linge, Fuveau, FR;
Assignee:
STMICROELECTRONICS (ROUSSET) SAS, Rousset, FR;
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/06 (2006.01); G06F 21/72 (2013.01);
U.S. Cl.
CPC ...
H04L 9/0618 (2013.01); G06F 21/72 (2013.01); H04L 9/0625 (2013.01); H04L 9/0631 (2013.01); H04L 9/0662 (2013.01); H04L 2209/043 (2013.01); H04L 2209/08 (2013.01); H04L 2209/12 (2013.01);
Abstract
A cryptographic circuit performs a substitution operation of a cryptographic algorithm. For each substitution operation of the cryptographic algorithm, a series of substitution operations are performed by the cryptographic circuit. One of the substitution operations of the series is a real substitution operation corresponding to the substitution operation of the cryptographic algorithm. One or more other substitution operations of the series are dummy substitution operations. A position of the real substitution operation in said series is selected randomly.