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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− 42. Then based on this...
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