Paper 2014/448

Differential Attacks on Reduced SIMON Versions with Dynamic Key-guessing Techniques

Ning Wang, Xiaoyun Wang, Keting Jia, and Jingyuan Zhao

Abstract

SIMON is a family of lightweight block ciphers which are designed by the U.S National Security Agency in 2013. It has totally 10 versions corresponding to different block size $2n$ and key length $l_k$, named as SIMON$2n/l_k$. In this paper, we present a new differential attack by considering the sufficient bit conditions of the previous differential paths. Based on the bit conditions, we successfully propose a new type of dynamic key-guessing technique which greatly reduces the key space guessed. Our attacks work on the reduced SIMON of all 10 suggested versions, which improve the best previous results by 2 to 4 rounds. For verification, we implemented a practical attack on 19-round SIMON32 in a PC, and the experimental data confirm the correctness of the attack, which also fit the theoretical complexity and success rate very well. It is remarked that, our cryptanalysis only provides a more accurate security evaluation, and it does not mean the security problem of the whole SIMON family

Metadata
Available format(s)
PDF
Publication info
Preprint. MINOR revision.
Keywords
SIMONlightweight block cipherbit conditiondifferential attackdynamic key-guessing
Contact author(s)
wangning2012 @ mail sdu edu cn
History
2015-05-27: last of 3 revisions
2014-06-14: received
See all versions
Short URL
https://ia.cr/2014/448
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2014/448,
      author = {Ning Wang and Xiaoyun Wang and Keting Jia and Jingyuan Zhao},
      title = {Differential Attacks on Reduced {SIMON} Versions with Dynamic Key-guessing Techniques},
      howpublished = {Cryptology {ePrint} Archive, Paper 2014/448},
      year = {2014},
      url = {https://eprint.iacr.org/2014/448}
}
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