?? 如何實現des算法 - 華夏黑客同盟 - http--www_77169_org.htm
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XOR L[I-1]</FONT><FONT size=3>。</FONT></FONT></FONT></P>
<P style="LINE-HEIGHT: 150%"><FONT size=2><FONT color=#4444bb><FONT
face=Verdana>2-4-7</FONT><FONT size=3>、</FONT><FONT face=Verdana
size=3>L[I]=R[I-1]</FONT></FONT></FONT></P>
<P style="LINE-HEIGHT: 150%"><FONT size=2><FONT color=#4444bb><FONT
face=Verdana>2-4-8</FONT><FONT size=3>、從</FONT><FONT face=Verdana
size=3>2-4-1</FONT><FONT size=3>處開始循環執行，直到</FONT><FONT face=Verdana
size=3>K[16]</FONT><FONT size=3>被變換完成。</FONT></FONT></FONT></P>
<P style="LINE-HEIGHT: 150%"><FONT size=2><FONT color=#4444bb><FONT
face=Verdana>2-4-5</FONT><FONT size=3>、組合變換后的</FONT><FONT face=Verdana
size=3>R[16]L[16]</FONT><FONT size=3>（注意：</FONT><FONT face=Verdana
size=3>R</FONT><FONT size=3>作為開始的</FONT><FONT face=Verdana
size=3>32</FONT><FONT size=3>位），按下表（</FONT><FONT face=Verdana
size=3>IP-1</FONT><FONT size=3>）變換得到最后的結果。</FONT></FONT></FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>Final Permutation (IP**-1)</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>40 8 48 16 56 24 64 32</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>39 7 47 15 55 23 63 31</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>38 6 46 14 54 22 62 30</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>37 5 45 13 53 21 61 29</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>36 4 44 12 52 20 60 28</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>35 3 43 11 51 19 59 27</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>34 2 42 10 50 18 58 26</FONT></P>
<P style="LINE-HEIGHT: 150%" align=center><FONT face=Verdana color=#4444bb
size=2>33 1 41 9 49 17 57 25</FONT></P>
<P style="LINE-HEIGHT: 150%"><FONT size=2><FONT color=#4444bb>以上就是<FONT
face=Verdana size=3>DES</FONT><FONT size=3>算法的描述。</FONT></FONT></FONT></P>
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