1、凯撒加密解密上机实验报告计算机安全基础凯撒加密解密上 机 实 验 报 告 学 院 年级 专 业 班 学 生 姓 名 学 生 学 号 实验一 凯撒加密解密凯撒密码简介：恺撒密码的替换方法是通过排列明文和密文字母表，密文字母表示通过将明文字母表向左或向右移动一个固定数目的位置。例如，当偏移量是左移3的时候（解密时的密钥就是3）：明文字母表：ABCDEFGHIJKLMNOPQRSTUVWXYZ 密文字母表：DEFGHIJKLMNOPQRSTUVWXYZABC 使用时，加密者查找明文字母表中需要加密的消息中的每一个字母所在位置，并且写下密文字母表中对应的字母。需要解密的人则根据事先已知的密钥反过来操作
2、，得到原来的明文。例如：明文：THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG 密文：WKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ 源代码：#include kaisa.husing namespace std;void Kaisa:setI() cout i;void Kaisa:jiami() char a, b, c; cout a; b = char(z - i%26); c = char(Z - i%26); cout n密文是：t; while(a != n) if(a = a) | ( a =A) i
3、f(a = a) | ( a =A) cout c & a = Z) cout b & a = z) cout char(a + i%26 - 26); if(a = ) cout ; else cout a; a = cin.get(); cout endl;void Kaisa:setX() cout i;void Kaisa:jiemi() char a, b, c; cout a; b = char(a + i%26); c = char(A + i%26); cout n明文是：t; while(a != n) if(a = a) | ( a =A) if(a = b) | ( a
4、= c) cout = a & a b) cout = A & a c) cout char(a - i%26 + 26); if(a = ) cout ; else cout a; a = cin.get(); cout endl;int main() while(1) int t; cout 1.加密 endl 2.解密 endl 按其他键退出endl t; Kaisa kaisa; if(t = 1) kaisa.setI(); kaisa.jiami();cout加密完成nendl; else if(t = 2) kaisa.setX(); kaisa.jiemi();cout解密完成
5、nendl; else return 0; 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。源代码：#include#include#includedes_encode.hint key164
6、8;char str8;void main() EncodeMain();void EncodeMain() int i; char keychar8; int key28; int strkey8; printf(请输入8个要加密的字符：n); for(i=0;i8;i+) scanf(%c,&stri); getchar(); for(i=0;i8;i+) strkeyi=stri; printf(n输入明文的十六进制为:n); for(i=0;i8;i+) printf(%10x,strkeyi); printf(n请输入密钥(8个字符):n); for(i=0;i8;i+) scanf
7、(%c,&keychari); for(i=0;i8;i+) key2i=keychari; getchar(); Encode(strkey,key2); printf(n加密后十六进制密文是:n); for(i=0;i8;i+) printf(%10x,strkeyi); printf(nn请输入解密密码n); for(i=0;i8;i+) scanf(%c,&keychari); for(i=0;i8;i+) key2i=keychari; Decode(strkey,key2); for(i=0;i8;i+) printf(%10x,strkeyi); for(i=0;i8;i+) s
8、tri=strkeyi; printf(n明文为：t); for(i=0;i8;i+) printf(%c,stri); printf(nn); void keyBuild(int *keychar) int i,j; int movebit=1,1,2,2,2,2,2,2, 1,2,2,2,2,2,2,1; int midkey256; int midkey64; StrtoBin(midkey,keychar); for(i=0;i56;i+) midkey2i=midkeyPC1i-1; for(i=0;i16;i+) keyCreate(midkey2,movebiti,i); voi
9、d StrtoBin(int *midkey,int *keychar) int trans8,i,j,k,n; n=0; for(i=0;i8;i+) j=0; while(keychari!=0) transj=keychari%2; keychari=keychari/2; j+; for(k=j;k8;k+)transk=0; for(k=0;k8;k+) midkeyn+=trans7-k; void keyCreate(int *midkey2,int movebit,int n) int i,temp4; temp0=midkey20; temp1=midkey21; temp2
10、=midkey228; temp3=midkey229; if(movebit=2) for(i=0;i26;i+) midkey2i=midkey2i+2; midkey2i+28=midkey2i+30; midkey226=temp0;midkey227=temp1; midkey254=temp2;midkey255=temp3; else for(i=0;i27;i+) midkey2i=midkey2i+1; midkey2i+28=midkey2i+29; midkey227=temp0;midkey255=temp2; for(i=0;i48;i+) keyni=midkey2
11、PC2i-1;void EncodeData(int *lData,int *rData,int *str) int i,j,temp8,lint,rint; int data64; lint=0,rint=0; for(i=0;i4;i+) j=0; while(stri!=0) tempj=stri%2; stri=stri/2; j+; while(j8)tempj+=0; for(j=0;j8;j+) lDatalint+=temp7-j; j=0; while(stri+4!=0) tempj=stri+4%2; stri+4=stri+4/2; j+; while(j8)tempj
12、+=0; for(j=0;j8;j+)rDatarint+=temp7-j; for(i=0;i32;i+) datai=lDatai; datai+32=rDatai; for(i=0;i32;i+) lDatai=dataIP1i-1; rDatai=dataIP1i+32-1; void F(int *rData,int *key) int i,rDataP48; Expand(rData,rDataP); for(i=0;i48;i+) rDataPi=rDataPikeyi; ExchangeS(rDataP,rData); ExchangeP(rData); void Expand
13、(int *rData,int *rDataP) int i; for(i=0;i48;i+) rDataPi=rDataExi-1; void ExchangeS(int *rDataP,int *rData) int i,n,linex,liney; linex=liney=0; for(i=0;i48;i+=6) n=i/6; linex=(rDataPi1)+rDataPi+5; liney=(rDataPi+13)+(rDataPi+22)+(rDataPi+31)+rDataPi+4; FillBin(rData,n,snlinexliney); void ExchangeP(in
14、t *rData) int i,temp32; for(i=0;i32;i+) tempi=rDatai; for(i=0;i32;i+) rDatai=tempPi-1; void FillBin(int *rData,int n,int s) int temp4,i; for(i=0;i4;i+) tempi=s%2; s=s/2; for(i=0;i4;i+) rDatan*4+i=temp3-i; void DecodeData(int *str,int *lData,int *rData) int i;int a,b;int data64; a=0,b=0; for(i=0;i32;
15、i+) datai=lDatai; datai+32=rDatai; for(i=0;i32;i+) lDatai=dataIP2i-1; rDatai=dataIP2i+32-1; for(i=0;i32;i+) a=(lDatai&0x1)+(a1); b=(rDatai&0x1)+(b1); if(i+1)%8=0) stri/8=a;a=0; stri/8+4=b;b=0; void Encode(int *str,int *keychar) int lData32,rData32,temp32,rDataP48; int i,j; keyBuild(keychar); EncodeD
16、ata(lData,rData,str); for(i=0;i16;i+) for(j=0;j32;j+) tempj=rDataj; F(rData,keyi); for(j=0;j32;j+) rDataj=rDatajlDataj; for(j=0;j32;j+) lDataj=tempj; DecodeData(str,rData,lData);void Decode(int *str,int *keychar) int lData32,rData32,temp32,rDataP48; int i,j; keyBuild(keychar); EncodeData(lData,rData
17、,str); for(i=0;i16;i+) for(j=0;j32;j+) tempj=rDataj; F(rData,key15-i); for(j=0;j32;j+) rDataj=rDatajlDataj; for(j=0;j32;j+) lDataj=tempj; DecodeData(str,rData,lData);des_encode.h void EncodeMain(); void DecodeMain(); void Decode(int *str,int *keychar); void Encode(int *str,int *keychar); void keyBui
18、ld(int *keychar); void StrtoBin(int *midkey,int *keychar); void keyCreate(int *midkey2,int movebit,int i); void EncodeData(int *lData,int *rData,int *srt); void F(int *rData,int *key); void Expand(int *rData,int *rDataP); void ExchangeS(int *rDataP,int *rData); void ExchangeP(int *rData); void FillB
19、in(int *rData,int n,int s); void DecodeData(int *str,int *lData,int *rData); int IP1=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,
20、 63, 55, 47, 39, 31, 23, 15, 7, ;int IP2=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 ;int s416= 14
21、,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
22、,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,
23、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,
24、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
25、,13,15,3,5,8, 2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11 ;int Ex48= 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 ;int P32=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,
26、25 ;int PC156=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 ;int PC248=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,
