PROCEDE DE TRAITEMENT CRYPTOGRAPHIQUE COMPRENANT DES OPERATIONS BOOLEENNES SUR DES DONNEES MASQUEES DE MANIERE ARITHMETIQUE, DISPOSITIFS ET PRODUIT PROGRAMME D'ORDINATEUR CORRESPONDANTS

摘要

#CMT# #/CMT# The method involves obtaining (106) first arithmetically masked data (A) corresponding to result of an arithmetic operation between first data and a first mask (M). Result of an application of a Boolean function to the masked data is determined. Correction data (H) and a second mask (M1) are determined. An arithmetic operation between the correction data and the result is determined to deliver second arithmetically masked data (A1) corresponding to a result of arithmetic operation between the second mask and a result of an application of the Boolean function to the first data. #CMT# : #/CMT# Independent claims are also included for the following: (1) a computer program product comprising a set of program code instructions for implementing a cryptographic processing method (2) a non-transitory computer readable storage medium for storing a computer program comprising a set of instructions executed by a computer or a processor to implement a cryptographic processing method (3) a cryptographic processing device. #CMT#USE : #/CMT# Cryptographic processing method for protecting a chip card against side channel attacks. #CMT#ADVANTAGE : #/CMT# The method enables accessing and reading a table in a rapid manner to reduce complexity of the cryptographic processing step and reducing number of computing operations. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a flow diagram illustrating a cryptographic processing method.'(Drawing includes non-English language text)' A, A1 : Arithmetically masked data H : Correction data M, M1 : Masks 106 : Step for obtaining arithmetically masked data and mask.