Abstract

Impossible differential cryptanalysis is a powerful tool to evaluate the strength of a block cipher structure. In this paper, we investigate the impossible differential property of Nested-Feistel networks, which is a famous block cipher network used in lightweight block cipher design. We propose a 3-round 1-probability differential of 1-Nested-Feistel structures, which is a special case of Nested-Feistel network, by using this result, we can construct impossible differentials for any round of Nested-Feistel networks.

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