2023年现代密码学实验报告

现 代 密 码 学实 验 报 告学生姓名 学 号 专业班级 指导教师 学 院 信息科学与工程学院 完毕时间 2023年5月实验一 对称密码算法实验实验目的1.掌握密码学中经典的对称密码算法DES、AES、RC4的算法原理。2.掌握DES、AES、RC4的算法流程和实现方法。实验预备1. DES算法有什么特点？算法中的哪些结构保证了其混淆和扩散的特性？答：分组比较短、密钥太短、密码生命周期短、运算速度较慢。采用替代和置换的方法简朴有效地遵循了香农定理，替代操作通过S盒达成了混淆效果，置换操作通过P盒扩散效果。2. AES算法的基本原理和特点。答：AES加密数据块分组长度必须为128比特，密钥长度可以是128比特、192比特、256比特中的任意一个（假如数据块及密钥长度局限性时，会补齐）。AES加密有很多轮的反复和变换。大体环节如下：1、密钥扩展（KeyExpansion），2、初始轮（Initial Round），3、反复轮（Rounds），每一轮又涉及：SubBytes、ShiftRows、MixColumns、AddRoundKey，4、最终轮（Final Round），最终轮没有MixColumns。3. 流密码RC4的密钥流生成以及S盒初始化过程。答：RC4由伪随机数生成器和异或运算组成。RC4的密钥长度可变，范围是1,255。RC4一个字节一个字节地加解密。给定一个密钥，伪随机数生成器接受密钥并产生一个S盒。S盒用来加密数据，并且在加密过程中S盒会变化。 初始化长度为256的S盒。第一个for循环将0到255的互不反复的元素装入S盒。第二个for循环根据密钥打乱S盒。下面i,j是两个指针。每收到一个字节，就进行while循环。通过一定的算法（(a),(b)）定位S盒中的一个元素，并与输入字节异或，得到k。循环中还改变了S盒（(c)）。假如输入的是明文，输出的就是密文；假如输入的是密文，输出的就是明文。实验内容1. 分析DES、AES、RC4、SHA的实现过程。2. 用程序设计语言将算法过程编程实现。3. 完毕字符串数据的加密运算和解密运算输入明文：Idolikethisbook 输入密钥：cryption 实验环节1. 预习DES、AES、RC4算法。2. 写出算法流程，用程序设计语言将算法过程编程实现。DES算法流程：代码：#include memory.h#include stdio.h#include #include #include using namespace std;enumencrypt,decrypt;/ENCRYPT:加密，DECRYPT：解密void des_run(char out8,char in8,bool type=encrypt);/设立密钥void des_setkey(const char key8);static void f_func(bool in32,const bool ki48);/f函数static void s_func(bool out32,const bool in48);/s盒代替/变换static void transform(bool *out, bool *in, const char *table, int len);static void xor(bool *ina, const bool *inb, int len);/异或static void rotatel(bool *in, int len, int loop);/循环左移/字节组转换成位组static void bytetobit(bool *out,const char *in, int bits); /位组转换成字节组static void bittobyte(char *out, const bool *in, int bits); /置换IP表const static char ip_table64=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;/逆置换IP-1表const static char ipr_table64=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;/E位选择表static const char e_table48=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;/P换位表const static char p_table32=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;/pc1选位表const static char pc1_table56=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, 63,55,47,39,31,23,15, 7,62,54,46,38,30,22, 14,6,61,53,45,37,29, 21,13,5,28,20,12,4;/pc2选位表const static char pc2_table48=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, 39,56,34,53,46,42,50,36,29,32;/左移位数表const static char loop_table16=1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1;/S盒const static char s_box8416=/s114,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13,/s215,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,/s310,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,/s47,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,/s52,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,/s612,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,/s74,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,/s813,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11;static bool subkey1648;/16圈子密钥void des_run(char out8,char in8,bool type)static bool m64,tmp32,*li=&m0,*ri=&m32;bytetobit(m,in,64);transform(m,m,ip_table,64);if(type=encrypt)for(int i=0;i=0;i-)memcpy(tmp,li,32);f_func(li,subkeyi);xor(li,ri,32);memcpy(ri,tmp,32);transform(m,m,ipr_table,64);bittobyte(out,m,64);void des_setkey(const char key8)static bool k64, *kl=&k0, *kr=&k28;bytetobit(k,key,64);transform(k,k,pc1_table,56);for(int i=0;i16;i+)rotatel(kl,28,loop_tablei);rotatel(kr,28,loop_tablei);transform(subkeyi,k,pc2_table,48);void f_func(bool in32,const bool ki48)static bool mr48;transform(mr,in,e_table,48);xor(mr,ki,48);s_func(in,mr);transform(in,in,p_table,32);void s_func(bool out32,const bool in48)for(char i=0,j,k;i8;i+,in+=6,out+=4)j=(in01)+in5;k=(in13)+(in22)+(in31)+in4;bytetobit(out,&s_boxijk,4);void transform(bool *out,bool *in,const char *table,int len)static bool tmp256;for(int i=0;ilen;i+)tmpi=intablei-1;memcpy(out,tmp,len);void xor(bool *ina,const bool *inb,int len)for(int i=0;ilen;i+)inai=inbi;void rotatel(bool *in,int len,int loop)static bool tmp256;memcpy(tmp,in,loop);memcpy(in,in+loop,len-loop);memcpy(in+len-loop,tmp,loop);void bytetobit(bool *out,const char *in,int bits) for(int i=0;i(i%8)&1;void bittobyte(char *out,const bool *in,int bits)memset(out,0,(bits+7)/8);for(int i=0;ibits;i+)outi/8|=ini(i%8);void main()string str;puts(*DES*);coutstr;/getline(cin,str);printf(n);char key8;coutplease input your key(8):;for(int p=0;pkeyp;des_setkey(key);int m=str.size();int n=m/8+1;str=str.substr(0,m);int i=0;string aw,mw;for(n;n0;n-)char *str1=new char8;string temp;temp=str.substr(i,8);i=i+8;strcpy(str1,temp.c_str();des_run(str1,str1,encrypt);aw=aw+str1;aw=aw.substr(0,m+6);/m+1-m+6 des_run(str1,str1,decrypt);mw=mw+str1;string temp1;strcpy(str1,temp1.c_str();str1=;temp=;puts(after encrypting:); coutawendl;puts(after decrypting:); coutmwendl;AES算法流程图：代码：#include#include#include#define null 0const unsigned char Sbox256 = / forward s-box0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16;const unsigned char ISbox256 = / inverse s-box0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d;static unsigned char AesRcon11*4=0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,0x02, 0x00, 0x00, 0x00,0x04, 0x00, 0x00, 0x00,0x08, 0x00, 0x00, 0x00,0x10, 0x00, 0x00, 0x00,0x20, 0x00, 0x00, 0x00,0x40, 0x00, 0x00, 0x00,0x80, 0x00, 0x00, 0x00,0x1b, 0x00, 0x00, 0x00,0x36, 0x00, 0x00, 0x00;static unsigned char gfmultby01(unsigned char b) return b; static unsigned char gfmultby02(unsigned char b) if (b 0x80) return (unsigned char)(int)(b 1); else return (unsigned char)( (int)(b 1) (int)(0x11B) ); static unsigned char gfmultby03(unsigned char b) return (unsigned char) ( (int)gfmultby02(b) (int)b ); static unsigned char gfmultby09(unsigned char b) return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b) (int)b ); static unsigned char gfmultby0b(unsigned char b) return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b) (int)gfmultby02(b) (int)b ); static unsigned char gfmultby0d(unsigned char b) return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b) (int)gfmultby02(gfmultby02(b) (int)(b) ); static unsigned char gfmultby0e(unsigned char b) return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b) (int)gfmultby02(gfmultby02(b) (int)gfmultby02(b) ); /密钥移位函数unsigned char* RotWord(unsigned char* word)unsigned char* temp = new unsigned char4;temp0 = word1;temp1 = word2;temp2 = word3;temp3 = word0;return temp;unsigned char* SubWord(unsigned char* word)unsigned char* temp = new unsigned char4;for(int j=0;j4;j+)tempj = Sboxwordj; return temp;void chartomatrix(unsigned char*str,unsigned char Base4) int r,c; for(c=0;c4;c+) for(r=0;r4;r+) Baserc=str4 * c+r; void ByteSub(unsigned char a44,unsigned char b44) /字节转换 int r,c; for(r=0;r4;r+) for(c=0;c4;c+) brc=(Sboxarc); void IvByteSub(unsigned char a4,unsigned char b4) /逆字节转换 int r,c; for(r=0;r4;r+) for(c=0;c4;c+) brc=ISboxarc;void ShiftRow(unsigned char b4,unsigned char C4) /行变换 int r,c; for(r=0;r4;r+) for(c=0;c4;c+) Crc=br(c+r)%4; void IvShiftRow(unsigned char b4,unsigned char C4) /逆移动行变换 int r,c; for(r=0;r4;r+) for(c=0;c4;c+) Crc=br(c+4-r)%4; void MixColumn(unsigned char C4,unsigned char d4) /混合列变换 int c; for(c=0;c4;c+) d0c=(unsigned char)(int)gfmultby02(C0c) (int)gfmultby03(C1c) (int)gfmultby01(C2c) (int)gfmultby01(C3c); for(c=0;c4;c+) d1c=(unsigned char)(int)gfmultby01(C0c) (int)gfmultby02(C1c) (int)gfmultby03(C2c) (int)gfmultby01(C3c); for(c=0;c4;c+) d2c=(unsigned char)(int)gfmultby01(C0c) (int)gfmultby01(C1c) (int)gfmultby02(C2c) (int)gfmultby03(C3c); for(c=0;c4;c+) d3c=(unsigned char)(int)gfmultby03(C0c) (int)gfmultby01(C1c) (int)gfmultby01(C2c) (int)gfmultby02(C3c);void IvMixColumn(unsigned char C4,unsigned char d4) /逆混合列变换 int c; for(c=0;c4;c+) d0c=(unsigned char)(int)gfmultby0e(C0c) (int)gfmultby0b(C1c) (int)gfmultby0d(C2c) (int)gfmultby09(C3c); for(c=0;c4;c+) d1c=(unsigned char)(int)gfmultby09(C0c) (int)gfmultby0e(C1c) (int)gfmultby0b(C2c) (int)gfmultby0d(C3c); for(c=0;c4;c+) d2c=(unsigned char)(int)gfmultby0d(C0c) (int)gfmultby09(C1c) (int)gfmultby0e(C2c) (int)gfmultby0b(C3c); for(c=0;c4;c+) d3c=(unsigned char)(int)gfmultby0b(C0c) (int)gfmultby0d(C1c) (int)gfmultby09(C2c) (int)gfmultby0e(C3c); void AddRoundKey(unsigned char d4,unsigned char key4,unsigned char e4) /加循环密钥 int r,c; for(r=0;r4;r+) for(c=0;c4;c+) erc=(unsigned char)(int)drc(int)keyrc); void KeyProducing(unsigned char*key,unsigned char K444) /扩展初始密钥到44列 unsigned char BaseK44=0; chartomatrix(key,BaseK); int r,c; unsigned char *temp=new unsigned char4; for(c=0;c4;+c) for(r=0;r4;+r) Krc=BaseKrc; for(c=4;c44;c+) if(c%4!=0) for(r=0;r4;r+) Krc=(unsigned char)(int)Krc-4 (int)Krc-1); else for(r=0;r4;r+)tempr=Krc-1; temp=SubWord(RotWord(temp); temp0 = (unsigned char)( (int)temp0 (int) AesRconc+0 ); temp1 = (unsigned char)( (int)temp1 (int) AesRconc+1 ); temp2 = (unsigned char)( (int)temp2 (int) AesRconc+2 ); temp3 = (unsigned char)( (int)temp3 (int) AesRconc+3 ); for(r=0;r4;r+)Krc=(unsigned char)(int)Krc-4 tempr); void Encode(unsigned char *Mwen,unsigned char K44,unsigned char*out) unsigned char BaseM44=0; int round,r,c; unsigned char Ki44=0; unsigned char e44=0,b44=0,C44=0,d44=0; chartomatrix(Mwen,BaseM); for(r=0;r4;r+) for(c=0;c4;c+) Kirc=Krc; /第0个循环密钥 AddRoundKey(BaseM,Ki,e); /ARK,使用第0个循环密钥 for(round=1;round10;round+) ByteSub(e,b); /字节转换 ShiftRow(b,C); /移动行变换 MixColumn(C,d); /混合列变换 for(r=0;r4;r+) for(c=0;c4;c+) Kirc=Kr4*round+c; /产生第round轮循环的密钥Ki AddRoundKey(d,Ki,e); /roundth循环加密 ByteSub(e,b); /第10次循环加密的移动行变换 for(r=0;r4;r+) for(c=0;c4;c+) Kirc=Kr4*10+c; /产生第10轮循环的密钥Ki AddRoundKey(C,Ki,e); /10th循环加密 for(c=0;c4;c+) for(r=0;r4;r+) outr+4*c=erc; /加密结果转换成输入 void Decode(unsigned char*Miwen,unsigned char K44,unsigned char*out) unsigned char BaseM44=0; unsigned char Ki44=0; unsigned char e44=0,b44=0,C44=0,d44=0; int round,r,c; chartomatrix(Miwen,BaseM); for(r=0;r4;r+) for(c=0;c0;round-) IvShiftRow(e,b); IvByteSub(b,C); for(r=0;r4;r+) for(c=0;c4;c+) Kirc=Kr4*round+c; /产生第round轮循环的密钥Ki AddRoundKey(C,Ki,d); IvMixColumn(d,e); IvShiftRow(e,b); IvByteSub(b,C); for(r=0;r4;r+) for(c=0;c4;c+) Kirc=Krc; /产生第round轮循环的密钥Ki AddRoundKey(C,Ki,e); /ARK,使用第0个循环密钥 for(c=0;c4;c+) for(r=0;r4;r+) outr+4*c=erc; /加密结果转换成输入void main() unsigned char K444=0; unsigned char *Mwen=new unsigned char17; unsigned char key=3456; unsigned char outjiam16=0; unsigned char outjiem16=0; int i; char filename15 ; cout请输入待加密字符串所在文献的文献名：(文献名的长度不要超过15个字符)filename; ifstream file; file.open(filename,ios:binary,0); file.seekg(0,ios:beg); file.get(Mwen,17,#); file.close(); cout加密前的明文:endl; coutMwenendl; KeyProducing(key,K); Encode(Mwen,K,outjiam); coutn加密后的密文:n; for(i=0;i16;i+)coutsetw(2)setfill(0)hex(int)outjiami; coutendl; Decode(outjiam,K,outjiem); coutn密文解密后的明文:n; for(i=0;i=128) cout(char)(outjiemi%128); else cout(char)(outjiemi); coutendlendl; RC4算法流程：算法的初始化部分（用类C伪代码表达）：for (i=0; in; i+)si=i;j=0;for (i=0; in; i+)j=(j+si+ki)%n;swap(si, sj);在初始化的过程中，密钥的重要功能是将S-box搅乱，i保证S-box的每个元素都得到解决，j保证S-box的搅乱是随机的。而不同的S-box在通过伪随机子密码生成算法的解决后可以得到不同的子密钥序列，并且，该序列是随机的：i=j=0;while (明文未结束)+i%=n;j=(j+s)%n;swap(