Fast Skinny-128 SIMD Implementations for Sequential Modes of Operation

Alexandre Adomnicai; Kazuhiko Minematsu; Maki Shigeri

Paper 2022/578

Fast Skinny-128 SIMD Implementations for Sequential Modes of Operation

Alexandre Adomnicai, Kazuhiko Minematsu, and 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.

Metadata

Available format(s): PDF
Category: Implementation
Publication info: Published elsewhere. ACISP 2022
Keywords: Skinny Romulus SIMD NIST LWC
Contact author(s): alex adomnicai @ gmail com
History: 2022-05-16: received
Short URL: https://ia.cr/2022/578
License: CC BY

BibTeX

@misc{cryptoeprint:2022/578,
      author = {Alexandre Adomnicai and Kazuhiko Minematsu and Maki Shigeri},
      title = {Fast Skinny-128 {SIMD} Implementations for Sequential Modes of Operation},
      howpublished = {Cryptology {ePrint} Archive, Paper 2022/578},
      year = {2022},
      url = {https://eprint.iacr.org/2022/578}
}