Paper 2013/626
Improved Linear Attacks on the Chinese Block Cipher Standard
Mingjie Liu and Jiazhe Chen
Abstract
The block cipher used in the Chinese Wireless LAN Standard (WAPI), SMS4, was recently renamed as SM4, and became the block cipher standard issued by the Chinese government. This paper improves the previous linear cryptanalysis of SMS4 by giving the first 19-round one-dimensional approximations. The 19-round approximations hold with bias 2^{−62.27}; we use one of them to leverage a linear attack on 23-round SMS4. Our attack improves the previous 23-round attacks by reducing the time complexity. Furthermore, the data complexity of our attack is further improved by the multidimensional linear approach.
Note: Acknowledgments updated
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- Block CipherSMS4Linear CryptanalysisMultidimensional Linear Cryptanalysis
- Contact author(s)
- liumj9705 @ gmail com
- History
- 2013-10-01: revised
- 2013-09-30: received
- See all versions
- Short URL
- https://ia.cr/2013/626
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2013/626,
author = {Mingjie Liu and Jiazhe Chen},
title = {Improved Linear Attacks on the Chinese Block Cipher Standard},
howpublished = {Cryptology {ePrint} Archive, Paper 2013/626},
year = {2013},
url = {https://eprint.iacr.org/2013/626}
}
