Linear approximations of the Flystel construction

Tim Beyne; Clémence Bouvier

Paper 2024/1465

Linear approximations of the Flystel construction

Tim Beyne

, KU Leuven, Ruhr University Bochum

Clémence Bouvier

, Ruhr University Bochum

Abstract

Using a purity theorem for exponential sums due to Rojas-Léon, we upper bound the absolute correlations of linear approximations of the Flystel construction used in Anemoi. This resolves open problem 7.1 in [Bouvier, 2023].

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Preprint.
Keywords: Linear cryptanalysis Flystel
Contact author(s): tim beyne @ esat kuleuven be
clemence bouvier @ rub de
History: 2024-09-21: approved; 2024-09-19: received; See all versions
Short URL: https://ia.cr/2024/1465
License: CC BY

BibTeX

@misc{cryptoeprint:2024/1465,
      author = {Tim Beyne and Clémence Bouvier},
      title = {Linear approximations of the Flystel construction},
      howpublished = {Cryptology {ePrint} Archive, Paper 2024/1465},
      year = {2024},
      url = {https://eprint.iacr.org/2024/1465}
}