Cryptanalysis of Full BEANIE

Xavier Bonnetain; Sébastien Duval; Virginie Lallemand; Thierno Mamoudou Sabaly; Thomas Sagot; Thibault Sanvoisin

Paper 2025/2297 Original: eprint.iacr.org/2025/2297 ↗

Cryptanalysis of Full BEANIE

Xavier Bonnetain

Sébastien Duval

Virginie Lallemand

Thierno Mamoudou Sabaly

Thomas Sagot

Thibault Sanvoisin

Abstract

Beanie is a tweakable block cipher recently published at ToSC aiming for memory encryption of microcontroller units. In line with this goal, it handles small plaintexts of only 32 bits and has a low latency. In this paper, we propose the first third-party analysis of the two variants of Beanie. By carefully leveraging structural properties of the cipher and taking advantage of its distinctive attack model, we manage to mount several key-recovery attacks against both the 5+5-round version and the 7+7-round version.

Metadata

Available format(s): PDF
Category: Attacks and cryptanalysis
Publication info: Preprint.
History: 2026-10-15: last updated; 2025-12-20: published
Short URL: https://ia.cr/2025/2297
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2025/2297,
      author = {Xavier Bonnetain and Sébastien Duval and Virginie Lallemand and Thierno Mamoudou Sabaly and Thomas Sagot and Thibault Sanvoisin},
      title = {Cryptanalysis of Full BEANIE},
      howpublished = {Cryptology {ePrint} Archive, Paper 2025/2297},
      year = {2025},
      url = {https://eprint.iacr.org/2025/2297}
}