%0 Journal Article
%T Linear cryptanalysis for a class of feistel ciphers<br>一类Feistel密码的线性分析
%A Lu Shuwang Zhang Ruwen
%A <br>吕述望
%A 张如文
%J 电子与信息学报
%D 2003
%I 
%X In this paper, a new method is proposed for seeking the upper bounds of maximum linear bias for block ciphers, which is especially applicable to a class of Feistel ciphers that key is XORed with data. This technique consists of two steps. Firstly, the mathematical relationship between linear bias of ciphers and linear bias of round function F and S-box respectively is given by carrying out strictly mathematical expression of linear bias for ciphers. Next, the upper bounds of linear bias for ciphers are determined by seeking the solution with minimum weight for linear equation group. Using this method the upper bounds of linear bias within 32 rounds are given.
%K Linear cryptanalysis
%K Linear bias expression
%K Feistel ciphers
%K Round function
%K S-box<br>线性分析
%K 线性偏差表达式
%K Fleistel密码
%K 轮函数
%K S盒
%K 分组密码
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=3621D4F7F39BBBC0&yid=D43C4A19B2EE3C0A&vid=C5154311167311FE&iid=9CF7A0430CBB2DFD&sid=72EB001A9B3C78CE&eid=D92306F676C2377C&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=5&reference_num=3