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Iterative Block Ciphers from Tweakable Block Ciphers with Long Tweaks
2020
IACR Transactions on Symmetric Cryptology
We consider a problem of constructing a secure block cipher from a tweakable block cipher (TBC) with long tweaks. Given a TBC with n-bit blocks and Γn-bit tweaks for Γ ≥ 1, one of the constructions by Minematsu in DCC 2015 shows that a simple iteration of the TBC for 3d rounds yields a block cipher with dn-bit blocks that is secure up to 2dn/2 queries, where d = Γ + 1. In this paper, we show three results. 1. Iteration of 3d − 2 rounds is enough for the security up to 2dn/2 queries, i.e., the
doi:10.13154/tosc.v2019.i4.54-80
dblp:journals/tosc/NakamichiI19
fatcat:oxsvra52orhdnego26a4zhn7nu