Method and device for fault detection

A computing device comprising:

• a processing device configured to perform first and second executions of a computing function based on one or more initial parameters, said computing function generating one or more modified values of at least one of said initial parameters;
• a first memory device configured to store said at least one initial parameter;
• and
• a second memory device coupled to said processing device and to said first memory device;
• wherein said processing device is configured to search, during said first execution, said second memory device for modified values of said initial parameters, read, during said first execution, said one or more initial parameters from said first memory device, and to store, during said first execution, said one or more modified values in said second memory device, and wherein said processing device is configured to store said one or more modified values in said second memory device in response to a write operation targeting a memory address of said one or more initial parameters in said first memory device, wherein said processing device is configured to detect an occurrence of a fault attack based on a difference between one or more modified values generated during the first execution and one or more second modified values generated during the second execution.

A memory configured to store computing instructions, the computing instructions configured to direct a processor in a computing device to perform a method of detecting an occurrence of a fault attack, the method comprising:

• storing at least one initial parameter in a first memory device;
• reading the at least one initial parameter from the first memory device;
• executing a computing function a first time, the computing function arranged to direct execution based on the at least one initial parameter;
• generating in the computing function at least one modified initial parameter;
• storing the at least one modified initial parameter in a second memory device;
• executing the computing function a second time, the computing function arranged to direct execution based on the at least one initial parameter;
• generating in the computing function at least one second modified initial parameter;
• and
• detecting an occurrence of a fault attack based on a difference between the at least one modified initial parameter generated during the first execution of the computing function and the at least one second modified initial parameter generated during the second execution of the computing function, wherein the at least one initial parameter is read from the first memory device during the first execution of the computing function after the second memory device is searched for at least one modified value of the at least one initial parameter.