supported by the National Basic Research 973 Program of China under Grant Nos.2013CB834201 and 2013CB834205;the Postdoctoral Science Foundation of China under Grant No.2013M540786;the National Natural Science Foundation of China under Grant Nos.61202493 and 61103237
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 gives a method for finding the ...