US 2018/0144228 A1 · METHOD OF SECURING A COMPARISON OF DATA DURING THE EXECUTION OF A PROGRAM

Abstract

This disclosure relates to a method for securing the execution of a program by a processor, including a comparison instruction for comparing two data items, followed by a program operation which is selected as a function of a comparison result provided by the comparison instruction. The method may include, before the execution of the comparison instruction, calculating in various ways comparison data representative of the equality of the data to be compared, after the execution of the comparison instruction, verifying whether the comparison data calculated are consistent with the fact that the program operation is selected or not selected, and activating an error signal if the comparison data are mutually inconsistent or inconsistent with the result of the comparison.

Claims12

Dependent claims

A method for securing the execution of a program by a processor, the program comprising a comparison instruction of two data items, followed by a program operation selected on the basis of a comparison result provided by the comparison instruction, the method comprising:

before the execution of the comparison instruction, computing comparison variables representative of the equality of the data items to be compared;
after executing the comparison instruction, checking whether the computed comparison variables are consistent with the selection or non-selection of the program operation;
and
enabling an error signal if the comparison variables are inconsistent with each other or with the result of the comparison.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/808,362Filed 9 Nov 2017

Priority

FR 155434813 May 2015

Published

24 May 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

G06K 19/07372
Means for preventing undesired reading or writing from or onto record carriers: by detecting tampering with the circuit
G06F 7/02
Methods or arrangements for processing data by operating upon the order or content of the data handled: comparing digital values
G06F 11/14
Responding to the occurrence of a fault, e.g. fault tolerance: error detection or correction of the data by redundancy in operations
G06F 21/52
Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems: during program…

Method of securing a comparison of data during the execution of a program

Life of this patent

Method of securing a comparison of data during the execution of a program

Life of this patent

Abstract

Claims12