Abstract
TI(threshold implementation) is a new masking method that is based on secret sharing and multi-party computation, which can resist the first-order DPA attacks provably and effectively. In this paper, we propose a new S-box scheme on SMS4 which is based on TI. The new S-box scheme uses a secret sharing method to group the input and output of S-box, which can effectively improve the safety of S-box, next, in order to reduce the computational difficulty, converting input to composite field inside the S-box. After analysis and verification, the new S-box scheme can effectively resist first-order DPA attack, and has lower power consumption and less realized area.
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