Improved Linear Cryptanalysis of SMS4 Block Cipher
Joo Yeon Cho, Kaisa Nyberg · 2011
SMS4 is a block cipher standard used for wireless communications in China. We analyze a reduced versions of SMS4 by the multidimensional linear cryptanalysis method. Our analysis shows that the 23-round of SMS4 can be attacked with 2 data complexity and time complexity less than exhaustive search.