An Improved DEFAULT-like Cipher via Dynamic Secret S-Boxes Against Differential Fault Attack
Linyang Yan, Huijiao Wang, Yongzhuang Wei · 2023
DEFAULT block cipher presented at ASIACRYPT 2021 was specially designed against differential fault attack (DFA). However, the security of DEFAULT against Information Combining Differential Fault Attack (IC-DFA) was further checked at EUROCRYPT 2022. It is illustrated that IC-DFA can recover the secret key of DEFAULT with less than 100 faults and negligible computational complexity. In this article, a variant cipher based on linear structure and dynamic secret S-box (called DEFAULT-DS) is proposed. More precisely, DEFAULT-DS introduces 15 secret S-boxes, where the selection of these S-boxes is determined by using the round subkey. Moreover, the experimental results show that DEFAULT-DS achieves better security level and stronger resistance against DFA compared with original DEFAULT. In particular, DEFAULT-DS can resist to both the classical DFA and IC-DFA. Furthermore, the software implementation complexity of DEFAULT-DS is similar as DEFAULT.