1、成績(jī)：2010 年信息安全引論課程報(bào)告題目：基于 DES 小型數(shù)據(jù)安全傳輸系統(tǒng)學(xué)號(hào) 200700401010姓名 李瑞典班級(jí) 計(jì) 071日期 10-11-24目錄第一章 概述3第二章 系統(tǒng)需求分析3第三章 系統(tǒng)設(shè)計(jì)3第四章 調(diào)試與運(yùn)行結(jié)果4第五章 總結(jié)和體會(huì)6第一章 概述隨著網(wǎng)絡(luò)應(yīng)用的普遍，人們利用網(wǎng)絡(luò)傳輸信息和數(shù)據(jù)已成為主要的途徑。但隨著網(wǎng)絡(luò)技術(shù)的發(fā)展，網(wǎng)絡(luò)信息傳輸?shù)陌踩跃统蔀榱宋覀冴P(guān)注的事情?，F(xiàn)在網(wǎng)絡(luò)掃描和網(wǎng)絡(luò)監(jiān)聽(tīng)的手段越來(lái)越高明和多樣化，所以，對(duì)網(wǎng)絡(luò)傳輸?shù)男畔⑦M(jìn)行加密成為了信息安全傳輸?shù)氖走x方法。DES 工作的基本原理： 其入口參數(shù)有三個(gè) :key、data、mode。key 為加密解

2、密使用的密鑰， data 為加密解密的數(shù)據(jù)， mode 為其工作模式。當(dāng)模式為加密模式時(shí)，明文按照 64 位進(jìn)行分組，形成明文組， key 用于對(duì)數(shù)據(jù)加密，當(dāng)模式為解密模式時(shí)， key 用于對(duì)數(shù)據(jù)解密。實(shí)際運(yùn)用中，密鑰只用到了 64 位中的 56 位，這樣才具有高的安全性。在通信網(wǎng)絡(luò)的兩端，雙方約定一致的 Key，在通信的源點(diǎn)用 Key 對(duì)核心數(shù)據(jù)進(jìn)行 DES 加密，然后以密碼形式在公共通信網(wǎng)中傳輸?shù)酵ㄐ啪W(wǎng)絡(luò)的終點(diǎn)， 數(shù)據(jù)到達(dá)目的后，用同樣的 Key 對(duì)密碼數(shù)據(jù)進(jìn)行解密，便再現(xiàn)了明碼形式的核心數(shù)據(jù)。本系統(tǒng)是基于 DES 加密算法對(duì)傳輸?shù)臄?shù)據(jù)進(jìn)行加密后再通過(guò)網(wǎng)絡(luò)傳輸，具有一定的安全性。即使黑客們

3、通過(guò)網(wǎng)絡(luò)監(jiān)聽(tīng)獲取到密文數(shù)據(jù)，但在有限的時(shí)間內(nèi)還是很難對(duì)密文進(jìn)行破解的。第二章 系統(tǒng)需求分析（1）功能需求：系統(tǒng)能安全地發(fā)送即時(shí)信息和文件；所有信息的傳輸都經(jīng)過(guò)加密后再發(fā)送到接收方；接收方能夠?qū)邮盏降牟煌?lèi)型的信息進(jìn)行處理； 當(dāng)接收到的是文件內(nèi)容時(shí)，保存到本地文件中。（2）設(shè)計(jì)需求：能夠選擇發(fā)送的是信息還是文件；具有良好的界面和可操作性。第三章 系統(tǒng)設(shè)計(jì)發(fā)送端：開(kāi)始密鑰處理信息發(fā)送文件傳輸網(wǎng)絡(luò)傳輸密鑰加密密文接收方退出接收端：開(kāi)始密鑰處理網(wǎng)絡(luò)傳輸密文發(fā)送端解密即時(shí)信息數(shù)據(jù)文件顯示信息保存文件退出第四章 調(diào)試與運(yùn)行結(jié)果（1）發(fā)送端和接收端界面：（2）發(fā)送和接收信息調(diào)試：（3）發(fā)送文件和接收文件調(diào)

4、試：（4）查看接收到的文件：第五章 總結(jié)和體會(huì)通過(guò)本次的課程學(xué)習(xí)和系統(tǒng)的編寫(xiě)，撐握了 DES 算法的加密技術(shù)。認(rèn)識(shí)到了網(wǎng)絡(luò)通信信息安全性的重要性?，F(xiàn)代的密碼學(xué)，除了用于保密通信之外，更多運(yùn)用于政治，外交，軍事，經(jīng)濟(jì)間來(lái)。隨著信息科技的不斷發(fā)展，密碼學(xué)已經(jīng)越來(lái)越成為社會(huì)的主角。DES 在 1977 年被美國(guó)國(guó)家標(biāo)準(zhǔn)技術(shù)協(xié)會(huì)認(rèn)可成為均衡加密算法的標(biāo)準(zhǔn),用于加密非機(jī)密的信息.des 廣泛應(yīng)用于各個(gè)行業(yè)的加密領(lǐng)域,如銀行業(yè).是一種古老的加密算法，但至今還有人在用?？梢?jiàn)，DES 算法的加密技術(shù)還是具有一定的安全性。普遍用于一些非重要信息的加密傳輸中。無(wú)論是哪種加密算法，都會(huì)有其的局限性和被破解性，所以，

5、在對(duì)通信信息進(jìn)行加密來(lái)提高安全性外，還應(yīng)加強(qiáng)信息倫理學(xué)的工作。提高網(wǎng)民的素質(zhì)和遵守網(wǎng)絡(luò)使用法規(guī)，才能更好的信息的安全性，構(gòu)建和諧的網(wǎng)絡(luò)環(huán)境！/客戶(hù)端#pragma comment(lib,ws2_32.lib) #include #include #include #include #include #include #include DES_fw.h/DES 加密和解密頭文件#include windows.h using namespace std;int send_file(SOCKET sock,char *name)/文件發(fā)送函數(shù)FILE *fd =fopen(name,rb );

6、if (fd=NULL)printf(文件打開(kāi)失敗n); return -1;int name_len = strlen(name); if(name_len0)for(int i=0;iread_count;i+=8)Des_Run(buffer+i, buffer+i, ENCRYPT);/每 8 個(gè)字節(jié)加密send(sock,buffer,read_count,0);shutdown(sock,SD_SEND); printf(文件發(fā)送完成n); return 0;int main()system(color F0);void send_msg(SOCKET sock,char *dat

7、a);/函數(shù)聲明int putout();int ch;char key8=1,9,8,0,9,1,7,2;Des_SetKey(key);WSADATA wsa_data;WSAStartup(0x0202,&wsa_data); SOCKET s_sock;s_sock = socket(AF_INET,SOCK_STREAM,0);sockaddr_in to_addr;/套接字地址簇to_addr.sin_family = AF_INET;to_addr.sin_port = htons(1024);to_addr.sin_addr.S_un.S_addr = inet_addr(12

8、7.0.0.1);/設(shè)為本機(jī)地址char file_name256 = 0; char data1024; memset(data,0,1024);if (connect(s_sock,(sockaddr *)&to_addr,sizeof(sockaddr) 0)/鏈接服務(wù)器（接收方）printf(鏈接接受文件電腦失敗n); return 0;do/菜單選擇循環(huán)ch=putout();send(s_sock,(char *)&ch,sizeof(int),0); switch(ch)case 1:send_msg(s_sock,data); break;case 2:printf(請(qǐng)輸入要發(fā)

9、送的文件名，并確保該文件存在于當(dāng)前目錄下n); scanf(%s,file_name);send_file(s_sock,file_name); return 0;break; case 3:break;while(ch!=3); return 0;void send_msg(SOCKET sock,char *data)/即時(shí)信息發(fā)送函數(shù)int len_data;printf(請(qǐng)輸入要發(fā)送的信息，退出請(qǐng)輸入 q：n); while(1)memset(data,0,1024); gets(data); len_data=strlen(data); if(len_data8)len_data=8

10、; if(data0=q)Des_Run(data, data, ENCRYPT); send(sock,data,len_data,0); system(cls);break;Des_Run(data, data, ENCRYPT);int sByte=send(sock,data,len_data,0); if(SOCKET_ERROR=sByte)closesocket(sock); WSACleanup(); break;int putout()/界面菜單顯示函數(shù)int chose;printf(n|- 基于 DES 的小型數(shù)據(jù)安全傳輸系統(tǒng) -|nn); printf(|1.基本信息傳

11、輸|n);printf(|2.文件傳輸|n);printf(|3.退出|n); while(1)printf(請(qǐng)選擇：);scanf(%d,&chose); getchar();if(chose=1|chose=2|chose=3) return chose;elseprintf(非法輸入!);/客戶(hù)端頭文件#include memory.h #include stdio.henum ENCRYPT,DECRYPT;/ ENCRYPT:加密,DECRYPT:解密void Des_Run(char Out8, char In8, bool Type=ENCRYPT);/ 設(shè)置密鑰void Des

12、_SetKey(const char Key8);static void F_func(bool In32, const bool Ki48);/ f 函數(shù)static void S_func(bool Out32, const bool In48);/ S 盒代替/ 變換static void Transform(bool *Out, bool *In, const char *Table, int len); static void Xor(bool *InA, const bool *InB, int len);/ 異或static void RotateL(bool *In, int

13、len, int loop);/ 循環(huán)左移/ 字節(jié)組轉(zhuǎn)換成位組static void ByteToBit(bool *Out, const char *In, int bits);/ 位組轉(zhuǎn)換成字節(jié)組static void BitToByte(char *Out, const bool *In, int bits);/置換 IP 表const static char IP_Table64 = 58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,3

14、3,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7;/逆置換 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

15、,57,25;/E 位選擇表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 換位表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;/PC

16、1 選位表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 選位表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

17、,41,52,31,37,47,55,30,40,51,45,33,48,44,49,39,56,34,53,46,42,50,36,29,32;/左移位數(shù)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 = / 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

18、,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,

19、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

20、,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,

21、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;static bool SubKey1648;/ 16 圈子密鑰void Des_Run(char Out8, char In8, bool T

22、ype)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 c

23、har 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_Ta

24、ble, 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)stati

25、c bool Tmp256; for(int i=0; ilen; i+)Tmpi = In Tablei-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,

26、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);/服務(wù)器#pragma comment(lib,ws2_32.lib) #include #include #include #include #include #include DES_pw.h

27、/DES 加密和解密頭文件#include string.h #include windows.hint recv_file(SOCKET sock)/接收文件函數(shù)char buffer1024 = 0;char pBuffer1024=解密后; int name_len,j=0;if (recv(sock,(char *)&name_len,sizeof(int),0) 0)printf(遠(yuǎn)程服務(wù)器斷開(kāi)); return -1;if (recv(sock,buffer,name_len,0)0)fwrite(buffer,1,recv_count,fp); for(int i=0;irecv

28、_count;i+=8)Des_Run(buffer+i, buffer+i, DECRYPT);/每 8 個(gè)字節(jié)解密fwrite(buffer,1,recv_count,fw);/保存文件fclose(fp); fclose(fw);printf(文件接收完成，成功保存至當(dāng)前目錄下n);return 0;void main()system(color F0);char key8=1,9,8,0,9,1,7,2;/設(shè)置密鑰Des_SetKey(key);void recv_msg(SOCKET);int ch;WSADATA wsa_data;/初始化套接字WSAStartup(0x0202,

29、&wsa_data);SOCKET s_sock;s_sock = socket(AF_INET,SOCK_STREAM,0);sockaddr_in se_addr; se_addr.sin_family = AF_INET; se_addr.sin_port = htons(1024);se_addr.sin_addr.S_un.S_addr = INADDR_ANY;bind(s_sock,(sockaddr*)&se_addr,sizeof(sockaddr);/服務(wù)器邦定if (listen(s_sock,10)0)int err = GetLastError();sockaddr_

30、in from_addr;int addr_len = sizeof(from_addr); printf(等侍接收信息：n);SOCKET temp_sock = accept(s_sock,(sockaddr *)&from_addr,&addr_len);/等侍鏈接char chuf10;domemset(chuf,0,10); recv(temp_sock,chuf,10,0); ch=*(int *)chuf;switch(ch)case 1:printf(接收信息：n); recv_msg(temp_sock); break;case 2:printf(接收文件：n); recv_

31、file(temp_sock); break;case 3:printf(對(duì)方關(guān)閉了連接！);while(ch!=3);void recv_msg(SOCKET sock)/接收信息函數(shù)char rbuf1024; char gbuf1024;memset(rbuf,0,1024); while(1)memset(rbuf,0,1024); memset(gbuf,0,1024);int rByte=recv(sock,rbuf,1024,0); if(SOCKET_ERROR=rByte)closesocket(sock); break;strcpy(gbuf,rbuf);Des_Run(r

32、buf, rbuf, DECRYPT); if(rbuf0=q)break;elseprintf(收到的信息是：%s ,gbuf); printf(解密后：%sn,rbuf);/服務(wù)器頭文件#include memory.h #include stdio.henum ENCRYPT,DECRYPT;/ ENCRYPT:加密,DECRYPT:解密void Des_Run(char Out8, char In8, bool Type=ENCRYPT);/ 設(shè)置密鑰void Des_SetKey(const char Key8);static void F_func(bool In32, const

33、 bool Ki48);/ f 函數(shù)static void S_func(bool Out32, const bool In48);/ S 盒代替/ 變換static void Transform(bool *Out, bool *In, const char *Table, int len); static void Xor(bool *InA, const bool *InB, int len);/ 異或static void RotateL(bool *In, int len, int loop);/ 循環(huán)左移/ 字節(jié)組轉(zhuǎn)換成位組static void ByteToBit(bool *O

34、ut, const char *In, int bits);/ 位組轉(zhuǎn)換成字節(jié)組static void BitToByte(char *Out, const bool *In, int bits);/置換 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

35、,55,47,39,31,23,15,7;/逆置換 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 位選擇表static const char E_Table48 = 32,1,2,3,4,5,4,5

36、,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 換位表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 選位表const static char PC1_Table56 = 57,49,41,33,25,17,9,1,5

37、8,50,42,34,26,18,10,2,59,51,43,35,27,19,11,3,60,52,44,36,63,55,47,39,31,23,15,7,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4;/PC2 選位表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

38、,50,36,29,32;/左移位數(shù)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 = / 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

39、,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,

40、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,

41、/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;static bool SubKey1648;/ 16 圈子密鑰void Des_Run(char Out8, char In8, bool Type)stat