Paper 2020/309 Original: eprint.iacr.org/2020/309 ↗
Cryptanalysis Results on Spook
Abstract
Spook is one of the 32 candidates that has made it to the second round of the NIST Lightweight Cryptography Standardization process, and is particularly interesting since it proposes differential side channel resistance. In this paper, we present practical distinguishers of the full 6-step version of the underlying permutations of Spook, namely Shadow-512 and Shadow-384, solving challenges proposed by the designers on the permutation. We also propose practical forgeries with 4-step Shadow for the S1P mode of operation in the nonce misuse scenario, which is allowed by the CIML2 security game considered by the authors. All the results presented in this paper have been implemented.
Metadata
- Available format(s)
PDF- Category
- Secret-key cryptography
- Publication info
- Preprint.
- History
- 2020-06-08: last updated
- 2020-03-12: published
- Short URL
- https://ia.cr/2020/309
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2020/309,
author = {Patrick Derbez and Paul Huynh and Virginie Lallemand and María Naya-Plasencia and Léo Perrin and André Schrottenloher},
title = {Cryptanalysis Results on Spook},
howpublished = {Cryptology {ePrint} Archive, Paper 2020/309},
year = {2020},
url = {https://eprint.iacr.org/2020/309}
}