function?cipher=DESDECP（DKM）

plaintext=D;
key=K;
DB=[];
for?i=1:16
????Di=D（i）;
????DBi=[‘0000‘dec2bin（hex2dec（Di））];
????DBi=DBi（end-3:end）;
????DBi=[str2num（DBi（1））str2num（DBi（2））str2num（DBi（3））str2num（DBi（4））];
????DB=[DBDBi];
end
D=DB;
KB=[];
for?i=1:16
????Ki=K（i）;
????KBi=[‘0000‘dec2bin（hex2dec（Ki））];
????KBi=KBi（end-3:end）;
????KBi=[str2num（KBi（1））str2num（KBi（2））str2num（KBi（3））str2num（KBi（4））];
????KB=[KBKBi];
end
K=KB;

%64位數據IP置換表
IP=[58?50?42?34?26?18?10?2;
????60?52?44?36?28?20?12?4;
????62?54?46?38?30?22?14?6;
????64?56?48?40?32?24?16?8;
????57?49?41?33?25?17?9?1;
????59?51?43?35?27?19?11?3;
????61?53?45?37?29?21?13?5;
????63?55?47?39?31?23?15?7];
IP0=reshape（IP‘164）;%轉換成行向量
D_IP=D（IP0）;%對D初始置換

%E盒為數據擴展
E=[32?1?2?3?4?5;
????4?5?6?7?8?9;
????8?910111213;
???121314151617;
???161718192021;
???202122232425;
???242526272829;
???28293031321];
S1=[14?4?13?1?2?15?11?8?3?10?6?12?5?9?0?7;
????0?15?7?4?14?2?13?1?10?6?12?11?9?5?3?8;
????4?1?14?8?13?6?2?11?15?12?9?7?3?10?5?0;
????15?12?8?2?4?9?1?7?5?11?3?14?10?0?6?13];
S2=[15?1?8?14?6?11?3?4?9?7?2?13?12?0?5?10;
????3?13?4?7?15?2?8?14?12?0?1?10?6?9?11?5;
????0?14?7?11?10?4?13?1?5?8?12?6?9?3?2?15;
????13?8?10?1?3?15?4?2?11?6?7?12?0?5?14?9];
S3=[10?0?9?14?6?3?15?5?1?13?12?7?11?4?2?8;
????13?7?0?9?3?4?6?10?2?8?5?14?12?11?15?1;
????13?6?4?9?8?15?3?0?11?1?2?12?5?10?14?7;
????1?10?13?0?6?9?8?7?4?15?14?3?11?5?2?12];
S4=[7?13?14?3?0?6?9?10?1?2?8?5?11?12?4?15;
????13?8?11?5?6?15?0?3?4?7?2?12?1?10?14?9;
????10?6?9?0?12?11?7?13?15?1?3?14?5?2?8?4;
????3?15?0?6?10?1?13?8?9?4?5?11?12?7?2?14];
S5=[2?12?4?1?7?10?11?6?8?5?3?15?13?0?14?9;
????14?11?2?12?4?7?13?1?5?0?15?10?3?9?8?6;
????4?2?1?11?10?13?7?8?15?9?12?5?6?3?0?14;
????11?8?12?7?1?14?2?13?6?15?0?9?10?4?5?3];
S6=[12?1?10?15?9?2?6?8?0?13?3?4?14?7?5?11;
????10?15?4?2?7?12?9?5?6?1?13?14?0?11?3?8;
????9?14?15?5?2?8?12?3?7?0?4?10?1?13?11?6;
????4?3?2?12?9?5?15?10?11?14?1?7?6?0?8?13];
S7=[4?11?2?14?15?0?8?13?3?12?9?7?5?10?6?1;
????13?0?11?7?4?9?1?10?14?3?5?12?2?15?8?6;
????1?4?11?13?12?3?7?14?10?15?6?8?0?5?9?2;
????6?11?13?8?1?4?10?7?9?5?0?15?14?2?3?12];
S8=[13?2?8?4?6?15?11?1?10?9?3?14?5?0?12?7;
????1?15?13?8?10?3?7?4?12?5?6?11?0?14?9?2;
????7?11?4?1?9?12?14?2?0?6?10?13?15?3?5?8;
????2?1?14?7?4?10?8?13?15?12?9?0?3?5?6?11];
%P盒置換
P=[1672021291228171152326518311028241432273919133062211425];
PC1=[5749413325179158504234261

?屬性????????????大小?????日期????時間???名稱
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?????文件???????6639??2012-12-27?17:08??DES\DESDECP.m

?????目錄??????????0??2012-12-29?16:12??DES

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?????????????????6639????????????????????2