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:
Mar. 03, 2020
Filed:
Jun. 28, 2017
Eshard, Martillac, FR;
Antoine Wurcker, Villenave d'Ornon, FR;
Christophe Clavier, Rilhac Lastours, FR;
ESHARD, Martillac, FR;
Abstract
A method for executing by a circuit a substitution operation such that an output data may be selected in a substitution table using an input data as an index. The substitution operation may be performed using a new masked substitution table. The input data may be combined by XOR operations with a new value of a first mask parameter, and the output data may be combined by XOR operations with a new value of a second mask parameter. The new masked substitution table may be generated by computing the new value of the first mask parameter by applying XOR operations to a previous value of the first mask parameter and to a first input mask, computing the new value of the second mask parameter by applying XOR operations to a previous value of the second mask parameter and to a second input mask, and generating the new masked substitution table using a previous masked substitution table and the first and second input masks.