CS-CIPHER两个变体的线性密码分析

Linear Cryptanalysis on Two Variants of CS-CIPHER

CS CIPHER是NESSIE公布的 17个候选算法之一 ,它的分组长度为 6 4 比特 .本文对CS CIPHER的两个变体进行了线性密码分析 .对第一个变体的攻击成功率约为 78 5 % ,数据复杂度为 2 52 ,处理复杂度为 2 3 2 .对第二个变体的攻击成功率约为 78 5 % ,数据复杂度为 2 52 ,处理复杂度为 2 112 .

CS CIPHER is a block cipher as a candidate for NESSIE,whose block length is 64 bits.In this paper two variants of CS CIPHER by linear cryptanalysis.The attack to the first variant needs 2 32 counters and 2 52 known plaintexts.The success rate of attack is about 78 5%.The attack to the second variant needs 2 52 known plaintexts and 2 112 counters.The success rate is about 78 5%.