Some results on cryptanalysis of SMS4 block cipher. (2nd July 2010)

• Record Type: Journal Article
• Authors: Zhang, Wentao; Su, Bozhan; Wu, Wenling; Feng, Dengguo
• Is Part Of: International journal of applied cryptography. Volume 2:Number 1(2010)
• Page Start: 60
• Page End: 67
• Publication Date: 2010-07-02
• Subjects: WAPI -- block ciphers -- SMS4 -- diffusion transformation -- differential cryptanalysis -- China -- wireless networks -- cryptography -- information security -- differential attacks; Data encryption (Computer science) -- Periodicals; Cryptography -- Periodicals; Computer security -- Periodicals; 652.8
• Languages: English
• ISSNs: 1753-0563

Abstract

SMS4 is a 128-bit block cipher used in the WAPI standard in wireless networks in China. The cipher has attracted much attention in the past several years. This paper consists of two parts. The first part is on the design of the linear diffusion layer L of SMS4. Some observations on L are present, which open out the design rationales of L and such class functions to a great extent. The second part is on the differential attack against SMS4. An effective 19-round differential characteristic is presented. Then, a simple differential attack on 23-round SMS4 is given, which is the best known attack on SMS4 so far.