【摘要】 在对标准ＤＥＳ算法中密钥的选位方法进行详细分析的基础上，指出了该选位方法潜在的不足，以及在某些情况下会大幅降低ＤＥＳ算法加密强度的原因；提出了几种有助于提高ＤＥＳ加密强度的选位方法；给出了相应的密钥选位方法实现的细节和程序。更多还原

【Abstract】 The paper points out potential limitation and the Teason that DES encryption intensity is reduced in some cases based on analysis of cryptographic key permutation choose of standard DES. puts forward a few methods of cryptographic key permutation choose helped to enhance DES encryption intensity,and gives the realization detail and program of the cryptographic key permutation choose.更多还原