?? des算法圖解.htm
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<p class=MsoNormal><span lang=EN-US>k<sub>i</sub></span></p>
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<p class=MsoNormal align=center style='text-align:center'><span
lang=EN-US>L<sub>i-1</sub>(32bit)</span></p>
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<p class=MsoNormal align=center style='text-align:center'><span
lang=EN-US>R<sub>i-1</sub>(32bit)</span></p>
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<p class=MsoNormal><span lang=EN-US>f</span></p>
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<p class=MsoNormal align=center style='text-align:center'><span
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<p class=MsoNormal align=center style='text-align:center'><span
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<p><br clear="all" style="mso-ignore:vglayout">
<span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">其中</span><span lang="EN-US">L<sub>i-1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman""></sub>和</span><span lang="EN-US">R<sub>i-1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman""></sub>分別是第</span><span lang="EN-US">i-1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">次迭代結果的左右兩部分，各</span><span lang="EN-US">32</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">比特。</span><span lang="EN-US">L<sub>0</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman""></sub>，</span><span lang="EN-US">R<sub>0</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman""></sub>是初始輸入經</span><span lang="EN-US">IP</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">置換的結果。</span>
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v:shapes="_x0000_s1065"><span lang="EN-US">k<sub>i</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman""></sub>是有</span><span lang="EN-US">64</span><span style="font-family:
宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">位密鑰產生的</span><span lang="EN-US">48</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">位子密鑰。</span></p>
<p class="MsoNormalIndent"><span lang="EN-US">f</span><span style="font-family:
宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">的功能是將</span><span lang="EN-US">32</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">比特的輸入轉換為</span><span lang="EN-US">32</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">比特的輸出。詳見下頁圖。</span></p>
<p class="MsoNormalIndent"
style="margin-left:0cm;mso-list:l0 level1 lfo16;
tab-stops:list 39.0pt 91.5pt"><span lang="EN-US">3．</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">子密鑰的生成。將原有密鑰重新排序，分成兩部分，再利用循環移位得到子密鑰的兩部分，再合成、重新排序為子密鑰。</span></p>
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