Abstract
Power-Aware Hiding (PAH) has been proposed as a kind of energy-efficient Side Channel Attacks (SCA) countermeasure for S-boxes. However, it has large area overhead. In this paper, an improved SCA-resistant AES S-box implementation, which is based on PAH technique but has smaller area, is proposed. It implements the S-Box in the masked composited field approach but applies the PAH method to the inversion in GF(2^4). Evaluation result shows that its area is shrunken to 47.7% of the full PAH S-box, and that its power-delay product is about 81% lower than that of the traditional masking implementation. Simulation shows that the PAH inverter's power difference is smaller than the other candidates, including the PAH S-box. It is secure under moment-correlating power analysis with 70,000 noiseless power traces at least.
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