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Title:
Fast Skinny-128 SIMD Implementations for Sequential Modes of Operation
Authors: Alexandre Adomnicai, Kazuhiko Minematsu, Maki Shigeri
Abstract:This paper reports new software implementation results for the Skinny-128 tweakable block ciphers on various SIMD architectures. More precisely, we introduce a decomposition of the 8-bit S-box into four 4-bit S-boxes in order to take advantage of vector permute instructions, leading to significant performance improvements over previous constant-time implementations. Since our approach is of particular interest when Skinny-128 is used in sequential modes of operation, we also report how it benefits to the Romulus authenticated encryption scheme, a finalist of the NIST LWC standardization process.
ePrint: https://eprint.iacr.org/2022/578
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