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:
Apr. 26, 2016
Filed:
Dec. 20, 2001
Nicolas Giraud, Le Chesnay, FR;
Abraham Brolh, Courbevoie, FR;
Patrice Hameau, Boulogne Billancourt, FR;
Nicolas Giraud, Le Chesnay, FR;
Abraham Brolh, Courbevoie, FR;
Patrice Hameau, Boulogne Billancourt, FR;
GEMALTO SA, Meudon, FR;
Abstract
The method for protecting a logic or mathematical operator of the NOR operator type, able to be used for executing a program in a microprocessor electronic module wherein the execution of the NOR operator is replaced by the execution (CAL-XORSEC(1) of a sequence Si operations having for final result a result identical to that of the XOR function. The sequence of operations Si composed of elementary operations with AND, OR and NOT is selected at each XOR operator from a set of eight equivalent sequences (S1 to S8) after determination CAL-NDO) of an order number ND0=1 according to the parameters of the program and/or a random parameter R supplied by a pseudo-random number generator (14).