对低轮SAFER++的差分-非线性密码分析
Differential-Nonlinear Cryptanalysis of Reduced-Round SAFER++
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摘要: SAFER + +是进入NESSIE第 2轮评估的 7个分组算法之一 采用差分密码分析和非线性密码分析相结合的方法对 4轮、5轮和 6轮SAFER + +进行分析 ,结果表明 :6轮SAFER + +对这种攻击方法不免疫 ;攻击 4轮和 5轮SAFER + +时 ,与已有结果相比 ,攻击复杂度大大减小 攻击对 2 2 50 个 2 5 6比特长度的密钥有效Abstract: SAFER++ is selected for further evaluation in NESSIE second phase. A technique which connects differential cryptanalysis and nonlinear cryptanalysis is used to attack 4,5 and 6 rounds of SAFER++. The results show that 6-round SAFER++ is not immune to this cryptanalysis, and this cryptanalysis is more effective when used to attack 4-round and 5-round SAFER++ than previous analysis.
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