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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。
Based on the detailed analysis of the key selection method in the standard DES algorithm, the potential deficiencies of this method are pointed out, and the reasons why the encryption strength of the DES algorithm can be greatly reduced in some cases are pointed out. Help to improve the DES encryption strength of the selected method; given the corresponding key selection method to achieve the details and procedures.