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对迭代型分组密码给出了新一类高阶差分，并对ＳＡＦＥＲ 进行了高阶差分密码分析．分析结果表明，对ＳＡＦＥＲ进行二阶差分攻击的效率远高于一阶差分
A new class of high-order difference is given for iterative block cipher, and high-order differential cryptanalysis of SAFER is performed. The analysis results show that the second-order differential attack on SAFER is far more efficient than the first-order difference