凯撒加密解密上机实验报告Word文件下载.docx
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}
jiami（）
chara,b,c;
\n请输入明文：
\t"
a;
b=char（'
z'
-i%26）;
c=char（'
Z'
\n密文是：
while（a!
='
\n'
）
{
if（（a<
&
&
a>
a'
）||（a<
='
A'
））
{if（（a<
=b&
=c&
char（a+i%26）;
if（a>
c&
a<
char（a+i%26-26）;
b&
if（a=='
'
}
else
a=cin.get（）;
endl;
setX（）
\n请输入解密密码：
jiemi（）
\n请输入密文：
+i%26）;
\n明文是：
=b）||（a<
=c））
char（a-i%26）;
b）
char（a-i%26+26）;
c）
intmain（）
while
（1）
intt;
1.加密"
<
endl
2.解密"
按其他键退出"
endl
选择：
t;
Kaisakaisa;
if（t==1）
kaisa.setI（）;
kaisa.jiami（）;
cout<
加密完成\n"
endl;
elseif（t==2）
kaisa.setX（）;
kaisa.jiemi（）;
解密完成\n"
return0;
测试：
密钥：
4，明文：
abcdefg
实验结果：
实验二DES加密解密
加密原理：
DES使用一个56位的密钥以及附加的8位奇偶校验位，产生最大64位的分组大小。
这是一个迭代的分组密码，使用称为Feistel的技术，其中将加密的文本块分成两半。
使用子密钥对其中一半应用循环功能，然后将输出与另一半进行“异或”运算；
接着交换这两半，这一过程会继续下去，但最后一个循环不交换。
DES使用16个循环，使用异或，置换，代换，移位操作四种基本运算。
#include<
stdio.h>
string.h>
#include"
des_encode.h"
intkey[16][48];
charstr[8];
voidmain（）
EncodeMain（）;
voidEncodeMain（）
{
inti;
charkeychar[8];
intkey2[8];
intstrkey[8];
printf（"
请输入8个要加密的字符：
\n"
）;
for（i=0;
i<
8;
i++）
scanf（"
%c"
&
str[i]）;
getchar（）;
strkey[i]=str[i];
\n输入明文的十六进制为:
%10x"
strkey[i]）;
\n请输入密钥（8个字符）:
keychar[i]）;
key2[i]=keychar[i];
Encode（strkey,key2）;
\n加密后十六进制密文是:
\n\n请输入解密密码\n"
Decode（strkey,key2）;
str[i]=strkey[i];
\n明文为：
str[i]）;
\n\n"
voidkeyBuild（int*keychar）{
inti,j;
intmovebit[]={1,1,2,2,2,2,2,2,
1,2,2,2,2,2,2,1};
intmidkey2[56];
intmidkey[64];
StrtoBin（midkey,keychar）;
56;
midkey2[i]=midkey[PC1[i]-1];
16;
keyCreate（midkey2,movebit[i],i）;
voidStrtoBin（int*midkey,int*keychar）{
inttrans[8],i,j,k,n;
n=0;
i++）{
j=0;
while（keychar[i]!
=0）{
trans[j]=keychar[i]%2;
keychar[i]=keychar[i]/2;
j++;
for（k=j;
k<
k++）trans[k]=0;
for（k=0;
k++）
midkey[n++]=trans[7-k];
voidkeyCreate（int*midkey2,intmovebit,intn）{
inti,temp[4];
temp[0]=midkey2[0];
temp[1]=midkey2[1];
temp[2]=midkey2[28];
temp[3]=midkey2[29];
if（movebit==2）{
26;
midkey2[i]=midkey2[i+2];
midkey2[i+28]=midkey2[i+30];
midkey2[26]=temp[0];
midkey2[27]=temp[1];
midkey2[54]=temp[2];
midkey2[55]=temp[3];
{for（i=0;
27;
midkey2[i]=midkey2[i+1];
midkey2[i+28]=midkey2[i+29];
midkey2[27]=temp[0];
midkey2[55]=temp[2];
48;
key[n][i]=midkey2[PC2[i]-1];
voidEncodeData（int*lData,int*rData,int*str）{
inti,j,temp[8],lint,rint;
intdata[64];
lint=0,rint=0;
4;
while（str[i]!
temp[j]=str[i]%2;
str[i]=str[i]/2;
while（j<
8）temp[j++]=0;
for（j=0;
j<
j++）
lData[lint++]=temp[7-j];
while（str[i+4]!
temp[j]=str[i+4]%2;
str[i+4]=str[i+4]/2;
j++）rData[rint++]=temp[7-j];
32;
data[i]=lData[i];
data[i+32]=rData[i];
lData[i]=data[IP1[i]-1];
rData[i]=data[IP1[i+32]-1];
voidF（int*rData,int*key）{
inti,rDataP[48];
Expand（rData,rDataP）;
rDataP[i]=rDataP[i]^key[i];
ExchangeS（rDataP,rData）;
ExchangeP（rData）;
voidExpand（int*rData,int*rDataP）{
rDataP[i]=rData[Ex[i]-1];
voidExchangeS（int*rDataP,int*rData）{
inti,n,linex,liney;
linex=liney=0;
i+=6）{
n=i/6;
linex=（rDataP[i]<
1）+rDataP[i+5];
liney=（rDataP[i+1]<
3）+（rDataP[i+2]<
2）+（rDataP[i+3]<
1）+rDataP[i+4];
FillBin（rData,n,s[n][linex][liney]）;
voidExchangeP（int*rData）{
inti,temp[32];
temp[i]=rData[i];
rData[i]=temp[P[i]-1];
voidFillBin（int*rData,intn,ints）{
inttemp[4],i;
temp[i]=s%2;
s=s/2;
rData[n*4+i]=temp[3-i];
voidDecodeData（int*str,int*lData,int*rData）{
inta,b;
intdata[64];
a=0,b=0;
lData[i]=data[IP2[i]-1];
rData[i]=data[IP2[i+32]-1];
a=（lData[i]&
0x1）+（a<
1）;
b=（rData[i]&
0x1）+（b<
if（（i+1）%8==0）{
str[i/8]=a;
a=0;
str[i/8+4]=b;
b=0;
voidEncode（int*str,int*keychar）{
intlData[32],rData[32],temp[32],rDataP[48];
keyBuild（keychar）;
EncodeData（lData,rData,str）;
temp[j]=rData[j];
F（rData,key[i]）;
j++）{
rData[j]=rData[j]^lData[j];
lData[j]=temp[j];
DecodeData（str,rData,lData）;
voidDecode（int*str,int*keychar）{
F（rData,key[15-i]）;
des_encode.h
voidEncodeMain（）;
voidDecodeMain（）;
voidDecode（int*str,int*keychar）;
voidEncode（int*str,int*keychar）;
voidkeyBuild（int*keychar）;
voidStrtoBin（int*midkey,int*keychar）;
voidkeyCreate（int*midkey2,intmovebit,inti）;
voidEncodeData（int*lData,int*rData,int*srt）;
voidF（int*rData,int*key）;
voidExpand（int*rData,int*rDataP）;
voidExchangeS（int*rDataP,int*rData）;
voidExchangeP（int*rData）;
voidFillBin（int*rData,intn,ints）;
voidDecodeData（int*str,int*lData,int*rData）;
intIP1[]={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,
};
intIP2[]={40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,
38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,
34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25
ints[][4][16]={{
{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}
},
{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}
{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}
{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}
{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}
{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}
{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}
{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}
};
intEx[48]={32,1,2,3,4,5,
4,5,6,7,8,9,
8,9,10,11,12,13,
12,13,14,15,16,17,
16,17,18,19,20,21,
20,21,22,23,24,25,
24,25,26,27,28,29,
28,29,30,31,32,1
intP[32]={16,7,20,21,
29,12,28,17,
1,15,23,26,
5,18,31,10,
2,8,24,14,
32,27,3,9,
19,13,30,6,
22,11,4,25
intPC1[56]={57,49,41,33,25,17,9,
1,58,50,42,34,26,18,
10,2,59,51,43,35,27,
19,11,3,60,52,44,36,
63,55,47,39,31,33,15,
7,62,54,46,38,30,22,
14,6,61,53,45,37,29,
21,13,5,28,20,12,4
intPC2[48]={14,17,11,24,1,5,
3,28,15,6,21,10,
23,19,12,4,26,8,
16,7,27,20,13,2,
41,52,31,37,47,55,
30,40,51,45,33,48,
44,49,39,56,34,53,
46,42,50,36,
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