A Study of Partial Non-Linear Layers with DEFAULT and BAKSHEESH

Anubhab Baksi

Paper 2024/1072

A Study of Partial Non-Linear Layers with DEFAULT and BAKSHEESH

Anubhab Baksi

, Nanyang Technological University

Abstract

In this work, we take a look at the two recently proposed block ciphers, DEFAULT and BAKSHEESH, both of which are descendent of another block cipher named GIFT. We show that both ciphers can be interpreted within the partial non-linear layer category, thanks to the SBoxes having at least one non-trivial linear structure. We also reevaluate the security claim of DEFAULT.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Preprint.
Keywords: SBox Linear Structure Partial Non-Linear Layer GIFT DEFAULT BAKSHEESH
Contact author(s): anubhab baksi @ ntu edu sg
History: 2024-07-02: approved; 2024-07-01: received; See all versions
Short URL: https://ia.cr/2024/1072
License: CC BY-NC-ND

BibTeX

@misc{cryptoeprint:2024/1072,
      author = {Anubhab Baksi},
      title = {A Study of Partial Non-Linear Layers with {DEFAULT} and {BAKSHEESH}},
      howpublished = {Cryptology ePrint Archive, Paper 2024/1072},
      year = {2024},
      note = {\url{https://eprint.iacr.org/2024/1072}},
      url = {https://eprint.iacr.org/2024/1072}
}