Paper 2017/1036
Rotational-XOR Cryptanalysis of Reduced-round SPECK
Yunwen Liu, Glenn De Witte, Adrián Ranea, and Tomer Ashur
Abstract
In this paper we formulate a SAT/SMT model for Rotational-XOR (RX) cryptanalysis in ARX primitives for the first time. The model is successfully applied to the block cipher family Speck, and distinguishers covering more rounds than previously are found, as well as RX-characteristics requiring less data to detect. In particular, we present distinguishers for 10, 11 and 12 rounds for Speck32/64 which have better probabilities than the previously known 9-round differential characteristic, for a certain weak key class. For versions of Speck48, we present several distinguishers, among which the longest one covering 15 rounds, while the previously best differential characteristic only covered 11.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- A minor revision of an IACR publication in FSE 2018
- DOI
- 10.13154/tosc.v2017.i3.24-36
- Keywords
- Rotational-XOR cryptanalysisARXWeak keysSATSMT
- Contact author(s)
- Tomer Ashur @ esat kuleuven be
- History
- 2017-10-28: received
- Short URL
- https://ia.cr/2017/1036
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2017/1036,
author = {Yunwen Liu and Glenn De Witte and Adrián Ranea and Tomer Ashur},
title = {Rotational-{XOR} Cryptanalysis of Reduced-round {SPECK}},
howpublished = {Cryptology {ePrint} Archive, Paper 2017/1036},
year = {2017},
doi = {10.13154/tosc.v2017.i3.24-36},
url = {https://eprint.iacr.org/2017/1036}
}
