Paper 2024/351
Improved Differential Meet-In-The-Middle Cryptanalysis
Abstract
In this paper, we extend the applicability of differential meet- in-the-middle attacks, proposed at Crypto 2023, to truncated differen- tials, and in addition, we introduce three new ideas to improve this type of attack: we show how to add longer structures than the original pa- per, we show how to improve the key recovery steps by introducing some probability in them, and we combine this type of attacks with the state- test technique, that was introduced in the context of impossible differ- ential attacks. Furthermore, we have developed a MILP-based tool to automate the search for a truncated differential-MITM attack with op- timized overall complexity, incorporating some of the proposed improve- ments. Thanks to this, we can build the best known attacks on the cipher CRAFT, reaching 23 rounds against 21 previously; we provide a new at- tack on 23-round SKINNY-64-192, and we improve the best attacks on SKINNY-128-384.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- A major revision of an IACR publication in EUROCRYPT 2024
- Keywords
- CryptanalysisTruncated Differentials cryptanalysiskey Recoverymeet-in-the-middle cryptanalysisCraft
- Contact author(s)
-
z_ahmadian @ sbu ac ir
a_khalesi @ sbu ac ir
dounia mfoukh @ inria fr
h moghimi @ mail sbu ac ir
maria naya_plasencia @ inria fr - History
- 2024-03-01: last of 2 revisions
- 2024-02-27: received
- See all versions
- Short URL
- https://ia.cr/2024/351
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2024/351,
author = {Zahra Ahmadian and Akram Khalesi and Dounia M'foukh and Hossein Moghimi and María Naya-Plasencia},
title = {Improved Differential Meet-In-The-Middle Cryptanalysis},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/351},
year = {2024},
url = {https://eprint.iacr.org/2024/351}
}