The Problem of Half Round Key XOR

Anubhab Baksi

Paper 2023/730

The Problem of Half Round Key XOR

Anubhab Baksi

, Nanyang Technological University

Abstract

In the design of GIFT, half round key XOR is used. This leads to the undesired consequence that the security against the differential/linear attacks are overestimated. This comes from the observation that; in the usual DDT/LAT based analysis of the differential/linear attacks, the inherent assumption is the full round key is XORed at each round.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Preprint.
Keywords: block cipher gift differential attack linear attack
Contact author(s): anubhab baksi @ ntu edu sg
History: 2023-05-24: last of 3 revisions; 2023-05-21: received; See all versions
Short URL: https://ia.cr/2023/730
License: CC BY-NC-SA

BibTeX

@misc{cryptoeprint:2023/730,
      author = {Anubhab Baksi},
      title = {The Problem of Half Round Key {XOR}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2023/730},
      year = {2023},
      url = {https://eprint.iacr.org/2023/730}
}