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:
Jul. 15, 2014
Filed:
Nov. 02, 2010
Pierre-yvan Liardet, Peynier, FR;
Fabrice Marinet, Chateauneuf le Rouge, FR;
Jérôme Tournemille, Pourrieres, FR;
Pierre-Yvan Liardet, Peynier, FR;
Fabrice Marinet, Chateauneuf le Rouge, FR;
Jérôme Tournemille, Pourrieres, FR;
STMicroelectronics (Rousset) SAS, Rousset, FR;
Abstract
A method for protecting a key implemented, by an electronic circuit, in a symmetrical algorithm for ciphering or deciphering a message, including the steps of: selecting in non-deterministic fashion a pair of different masks from a set of at least four different masks, the masks having the property of representing different bit combinations, at least by pairs of bits; executing the algorithm twice by applying, to the key or to the message, one of the masks of the selected pair at each execution; checking the consistency between the two executions.