Cryptanalysis of Reduced round SKINNY Block Cipher

Sadegh Sadeghi, Tahereh Mohammadi, Nasour Bagheri
<span title="2018-09-04">2018</span> <i title="IACR Transactions on Symmetric Cryptology"> <a target="_blank" rel="noopener" href="" style="color: black;">IACR Transactions on Symmetric Cryptology</a> </i> &nbsp;
SKINNY is a family of lightweight tweakable block ciphers designed to have the smallest hardware footprint. In this paper, we present zero-correlation linear approximations and the related-tweakey impossible differential characteristics for different versions of SKINNY .We utilize Mixed Integer Linear Programming (MILP) to search all zero-correlation linear distinguishers for all variants of SKINNY, where the longest distinguisher found reaches 10 rounds. Using a 9-round characteristic, we
more &raquo; ... nt 14 and 18-round zero correlation attacks on SKINNY-64-64 and SKINNY- 64-128, respectively. Also, for SKINNY-n-n and SKINNY-n-2n, we construct 13 and 15-round related-tweakey impossible differential characteristics, respectively. Utilizing these characteristics, we propose 23-round related-tweakey impossible differential cryptanalysis by applying the key recovery attack for SKINNY-n-2n and 19-round attack for SKINNY-n-n. To the best of our knowledge, the presented zero-correlation characteristics in this paper are the first attempt to investigate the security of SKINNY against this attack and the results on the related-tweakey impossible differential attack are the best reported ones.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="">doi:10.13154/tosc.v2018.i3.124-162</a> <a target="_blank" rel="external noopener" href="">dblp:journals/tosc/SadeghiMB18</a> <a target="_blank" rel="external noopener" href="">fatcat:fhho3h2h7ffarbywnxng7anuhi</a> </span>
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