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提出一种求S—盒的布尔函数表达式的系统方法,并由此法推出了DES中所有S—盒的布尔函数表达式,根据这些布尔函数表达式又导出了DES中S—盒的几点简单性质。
A systematic method to find the Boolean function expression of S-box is proposed. Based on this method, the Boolean function expressions of all the S-boxes in DES are deduced. Based on these Boolean function expressions, Point simple nature.