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- W62005486 abstract "Simon and Speck are families of lightweight block ciphers designed by the U.S. National Security Agency and published in 2013. Each of the families contains 10 variants, supporting a wide range of block and key sizes. Since the publication of Simon and Speck, several research papers analyzed their security using various cryptanalytic techniques. The best previously published attacks on all the 20 round-reduced ciphers are differential attacks, and are described in two papers (presented at FSE 2014) by Abed et al. and Biryukov et al. In this paper, we focus on the software-optimized block cipher family Speck, and describe significantly improved attacks on all of its 10 variants. In particular, we increase the number of rounds which can be attacked by 1, 2, or 3, for 9 out of 10 round-reduced members of the family, while significantly improving the complexity of the previous best attack on the remaining round-reduced member. Our attacks use an untraditional key recovery technique for differential attacks, whose main ideas were published by Albrecht and Cid at FSE 2009 in the cryptanalysis of the block cipher PRESENT. Despite our improved attacks, they do not seem to threaten the security of any member of Speck." @default.
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- W62005486 date "2014-01-01" @default.
- W62005486 modified "2023-10-13" @default.
- W62005486 title "Improved Differential Cryptanalysis of Round-Reduced Speck" @default.
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- W62005486 doi "https://doi.org/10.1007/978-3-319-13051-4_9" @default.
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