Title :
Improved Impossible Differential Cryptanalysis of SMS4
Author :
Tao Shi ; Wei Wang ; Qiuliang Xu
Author_Institution :
Sch. of Comput. Sci. & Technol., Shandong Univ., Jinan, China
Abstract :
The SMS4 is the first commercial block cipher published by Chinese government. It´s a 32-round block cipher encrypted by 128-bit keys. By analyzing the changes of the difference between input and output pairs in each round, this paper presents a new impossible differential path of the 14-round SMS4. Using this path, a new method is submitted to crypt analyze an 18-round SMS4. The time complexity of the attack is 2117:06 partial encryptions.
Keywords :
computational complexity; cryptography; SMS4; block cipher encryption; differential cryptanalysis; partial encryption; time complexity; Educational institutions; Wireless LAN; SMS4; block cipher; impossible differential attack;
Conference_Titel :
Computational Intelligence and Security (CIS), 2012 Eighth International Conference on
Conference_Location :
Guangzhou
Print_ISBN :
978-1-4673-4725-9
DOI :
10.1109/CIS.2012.116
