A novel “interclass information” side-channel distinguisher is compared to mutual information analysis. Interclass information possesses properties similar to mutual information but uses a different comparing strategy between the underlying conditional distributions. It is shown that interclass information can outperform mutual information in side-channel analysis, especially under low noise. The theoretical comparison is confirmed by simulations.
['Olivier Rioul', 'Annelie Heuser', 'Sylvain Guilley', 'Jean-Luc Danger']
Inter-class vs. mutual information as side-channel distinguishers