Patent ID: 8848903

Claim:
A side channel attack resistance evaluation apparatus that performs evaluation of resistance against differential side channel analysis using side channel information leaking from an encryption device, said apparatus comprising: a measurement circuit that measures the side channel information leaking from the encryption device; a noise removal circuit that removes noise from the side channel information measured by the measurement circuit, by using a band-pass filter; a passband determination circuit comprising a discrete Fourier transform (DFT) processing circuit and a differential frequency analysis (DFA) processing circuit, the discrete Fourier transform processing circuit calculating power spectrum of the side channel information for each frequency component by applying discrete Fourier transform processing to the side channel information measured by the measurement circuit, the differential frequency analysis processing circuit applying a differential frequency analysis to the power spectrum and determining a frequency component obtained as a result of the differential frequency analysis as the passband of the band-pass filter used in the noise removal circuit; and an evaluation circuit that applies differential side channel analysis to the side channel information that has been subjected to the noise removal by the noise removal circuit and evaluates resistance against the differential side channel analysis.