Improved Linear Cryptanalysis of Block Cipher BORON
Computer Journal（2024）CCF BSCI 4区
Chinese Acad Sci | Univ Chinese Acad Sci
Abstract
BORON is a lightweight substitution-permutation network cipher proposed in 2017. We reduce the number of guessed key bits by key-bridging technology and first utilize Fast Walsh Transform on BORON to minimize the time complexity. Finally, this paper gives the better key-recovery attack against block cipher BORON than previously proposed by 2 rounds: we realize a 11-round key-recovery attack on BORON-80 and 13-round key-recovery attack on BORON-128. The attacks proposed in this paper are the best attacks against BORON-80/128 to date.
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Key words
BORON,linear cryptanalysis,key-bridging technique,FWT
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