Cryptanalysis of Reduced-Round SMS4 Block Cipher

Authors:
Lei Zhang;Wentao Zhang;Wenling Wu
Affiliations:
State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, P.R. China 100190 and State Key Laboratory of Information Security, Graduate University o ...;State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, P.R. China 100190;State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, P.R. China 100190
Venue:
ACISP '08 Proceedings of the 13th Australasian conference on Information Security and Privacy
Year:
2008

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Abstract

SMS4 is a 128-bit block cipher used in the WAPI standard. WAPI is the Chinese national standard for securing Wireless LANs. Since the specification of SMS4 was not released until January 2006, there have been only a few papers analyzing this cipher. In this paper, firstly we present a kind of 5-round iterative differential characteristic of SMS4 whose probability is about 2驴 42. Then based on this kind of iterative differential characteristic, we present a rectangle attack on 16-round SMS4 and a differential attack on 21-round SMS4. As far as we know, these are the best cryptanalytic results on SMS4.