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. 29, 2009
Filed:
Dec. 11, 2003
Applicant:
Marc Joye, Saint Zacharie, FR;
Inventor:
Marc Joye, Saint Zacharie, FR;
Assignee:
Gemalto SA, Meudon, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/00 (2006.01); G06F 11/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention concerns a cryptographic method which includes integer division of the type q=a div b and/or a modular reduction of the type r=a mod b, with q being a quotient, a being a number of m bits, b being a number of n bits, n being not more than m and bbeing the most significant bit of the number b. The number a is masked by a random number p before performing the integer division and/or the modular reduction. The invention also concerns an electronic component for implementing the method. The invention is applicable for making smart cards secure against hidden channel attacks, and in particular differential attacks.