Abstract
In this paper, we focus on differential fault attack on lightweight block ciphers with GFN (Generalized Feistel Networks) structure. With regard to fault injection model and differential equations solving, two improved DFA (Differential Fault Analysis) methods are proposed. Based on this, we present the improved attack process which aims at applying lightweight block ciphers with GFN structure. We conduct 10000 DFA experiments on TWINE and LBlock. Result shows that it only takes 9.18 and 8.42 faults on average to recover the main key K respectively. Moreover, time and space complexity are both negligible.
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