Improved Linear Cryptanalysis of SMS 4 Block Cipher

  title={Improved Linear Cryptanalysis of SMS 4 Block Cipher},
  author={Joo Yeon Cho and Kaisa Nyberg},
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. 


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