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Near electromagnetic field measurement of microprocessor

Martinasek Z., Zeman V., Sysel P., Trasy K.

Przegląd Elektrotechniczny

2013

R. 89, nr 2a

203--207

The article describe systematically the electromagnetic (EM) side channels sources and electromagnetic field of the microprocessor and is focused on the best way how to measure the near electromagnetic field of microprocessor. It was suggested and realized several electromagnetic probes and it was performed the measurement regarded to the theoretical background on the testbed with cryptographic module (microprocessor) performed the Advanced Encryption Standard (AES). On the measured waveforms of the electromagnetic emission was studied the influence of probe construction namely two parameters wire diameter and number of turns. In following measurement was studied how induced voltage depending on the distance of measuring coil to microprocessor and the last measurement dealt with position of probe and microchip.

W artykule przedstawiono zagadnienie emisji pola elektromagnetycznego przez mikroprocesor i zawartych w nim informacji o stanie układu. Korzystając z platformy mikroprocesorowej, zaimplementowano AES i dokonano pomiarów sondami cewkowymi, badając zależność indukowanego napięcia od parametrów sondy (grubość drutu, ilość zwojów).

Optimization of differential power analysis

Martinasek Z., Macha T., Raso O., Martinasek J., Silhavy P.

Przegląd Elektrotechniczny

2011

R. 87, nr 12a

140-144

The article describes the optimization of differential side channel analysis which is often used in differential power analysis. The introductory chapters discusses in great detail the theoretical background of method. The new improvement is proposed, which allow reduction of the required calculations by 73% and it is in the worst case. The method is based on knowledge of the Hamming weight of secret key. Hamming weight of secret key can be determined by adding only one reference measurement of power consumption. The testbed focused on measuring direct emissions was built to verify proposal optimization and experimental verification was carried out.

W artykule opisano metodę optymalizacji różnicowej analizy mocy. Metoda bazuje na znajomości wag Hamminga. Są one określane przez dodanie jednego pomiaru poboru mocy odniesienia.