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:
Sep. 09, 2025
Filed:
Dec. 14, 2021
Thales Dis France Sas, Meudon, FR;
Mylène Roussellet, Saint Savournin, FR;
David Vigilant, Malakoff, FR;
Olivier Adjonyo Koffi Benit, Rosny-sous-bois, FR;
THALES DIS FRANCE SAS, Meudon, FR;
Abstract
Provided is a method for securing against high-order side-channel attacks wherein a substep of field inversion is performed by a cryptographic device. The method includes computing (S) a Dirac output value, adding (S) said Dirac output value to one of said shares of the first set of shares to obtain a second set of shares, performing a conversion of the second set of shares (S) from said (n+1) additive sharing to a (n+1)-multiplicative sharing, performing an inversion of each share of the (n+1)-multiplicative sharing (S), performing a conversion of the inverted shares (S) from said multiplicative sharing to a (n+1)-additive sharing to obtain a third set of shares, and adding (S) said Dirac output value to one of said shares of the third set of shares. Other embodiments disclosed.