A Correlation Power Analysis Countermeasure for Enocoro-128 v2 Using Random Switching Logic

Abstract

This paper shows Correlation Power Analysis (CPA) on Enocoro-128 v2 and application effectiveness of a countermeasure. Enocoro is a hardware-oriented stream cipher developed by Hitachi, Ltd. Previous work shows that Enocoro-128 v2 has a weakness against CPA. Another work shows that a countermeasure using algorithm level masking, threshold implementation, is effective for CPA. This paper proposes application of a gate level masking, Random Switching Logic (RSL) as another countermeasure for Enocoro-128 v2. We implement the circuit of Enocoro-128 v2 using RSL on SASEBO-GII (Side-Channel Attack Standard Evaluation Board), and evaluate its CPA countermeasure ability. As a result, we confirmed that it is impossible to reveal secret key by measurement using less than 100,000 power consumption waveforms.