Diffie-Hellman密鑰交換算法綜合實驗報告

（網(wǎng)絡(luò)安全方案設(shè)計基礎(chǔ)）實驗報告時間： 地點：軟件實驗室姓名班級學號指導教師實驗成績實驗名稱Diffie-Hellman密鑰交換算法實驗目的1、了解和掌握Diffie-Hellman算法原理及過程；2、通過密鑰交換算法實現(xiàn)對稱加解密密鑰的保密傳輸；3、能夠編寫代碼實現(xiàn)Diffie-Hellman算法，并實現(xiàn)數(shù)據(jù)保密傳輸。實驗內(nèi)容1、編寫Diffie-Hellman程序，協(xié)商出用于收、發(fā)雙方的加、解密密鑰K；2、模擬發(fā)送端A，用協(xié)商出的密鑰K，通過對稱加密算法（具體算法不限）將文本文件加密；模擬接收端B，用協(xié)商出的密鑰K，對接收到的密文解密。實驗過程A端的代碼#include<stdio.h>#include<math.h>intXa=3,Xb=5,Ya,Yb;/**********A端通過Yb計算Ka*************/intusera(alpha,q){intk1=pow(Yb,Xa);k1=k1%q;returnk1;}/**********B端通過Ya計算Kb*************/intuserb(alpha,q){intk2=pow(Ya,Xb);k2=k2%q;returnk2;/*函數(shù)聲明*/voidInitSbox(unsignedcharsbox[]);voidKeyExpansion(unsignedcharkey[],char*k,intlen);voidUpsetSbox(unsignedcharsbox[],unsignedcharkey[]);voidDataProcess(unsignedcharsbox[],FILE*fp1,FILE*fp2);voidDataEncrypt(char*k,unsignedchar*key,unsignedchar*sbox,FILE*fp1,FILE*fp2);voidDataDecrypt(char*k1,unsignedchar*key,unsignedchar*sbox,FILE*fp1,FILE*fp2);intwrite_file(charname[],chardata[],intsize);intread_file(charname[],chardata[],intsize);/*初始化S盒*/voidInitSbox(unsignedcharsbox[]){inti;for(i=0;i<256;i++)sbox[i]=i;}/*密鑰填充256數(shù)組刃voidKeyExpansion(unsignedcharkey[],char*k,intlen){inti;if(len<=256){for(i=0;i<256;i++)key[i]=k[i%len];}if(len>256){for(i=0;i<256;i++)key[i]=k[i];}}/*打亂S盒*/

intread_file(unsignedcharname[],chardata[],intsize){FILE*file=fopen(name,"rb+");if(file==NULL)return0;rewind(file);//移動指針到開頭fread(data,sizeof(char),size,file);//讀出一個數(shù)組fclose(file);return1;}intmain(intargc,constchar*argv[]){intq=11,alpha=2;intKa;unsignedcharkey1[25]={0x00},key2[25]={0x00};unsignedcharkey[256]={0x00};unsignedcharsbox[256]={0x00};FILE*fp1,*fp2;intflag=1,i;printf("A用戶端\n");printf("q=11,a=2\n");//CalculatingYaYa=pow(alpha,Xa);Ya=Ya%q;printf("計算得到Y(jié)a=%d\n",Ya);printf("請輸入B端的公鑰Yb:");scanfC'%d",&Yb);Ka=usera(alpha,q);printf("計算得到最終公鑰K=%d",Ka);key1[0]=Ka;/**********加密***********/fp1=fopen("mingwen.txt","r");if(fp1==NULL){printf（"打開源文件失敗!\n"）;getchar();exit(0);fp2=fopen("miwen.txt","w");if(fp2==NULL){printf（"打開加密后文件失敗!\n"）;getchar();exit(0);DataEncrypt(key1,key,sbox,fp1,fp2);return0;/********************************B端代碼************************************/#include<stdio.h>#include<math.h>intXb=5,Ya,Yb;/*函數(shù)聲明*/voidInitSbox(unsignedcharsbox[]);voidKeyExpansion(unsignedcharkey[],char*k,intlen);voidUpsetSbox(unsignedcharsbox[],unsignedcharkey[]);voidDataProcess(unsignedcharsbox[],FILE*fp1,FILE*fp2);voidDataEncrypt(char*k,unsignedchar*key,unsignedchar*sbox,FILE*fp1,FILE*fp2);voidDataDecrypt(char*k1,unsignedchar*key,unsignedchar*sbox,FILE*fp1,FILE*fp2);intwrite_file(charname[],chardata[],intsize);intread_file(charname[],chardata[],intsize);

/*加解密數(shù)據(jù)刃voidDataProcess(unsignedcharsbox[],FILE*fp1,FILE*fp2){//0加密，1解密inti=0,j=0,size=0;inttemp2,temp1,t;chark,cipherchar,data_Stream[100]={0x00};unsignedchartemp;charch=fgetc(fp1);while(ch!=EOF){i=(i+1)%256;temp2=j+(int)sbox[i];j=temp2%256;temp=sbox[i];sbox[i]=sbox[j];sbox[j]=temp;temp1=(int)sbox[i]+(int)sbox[j];t=temp1%256;data_Stream[size++]=k=sbox[t];cipherchar=chAk;fputc(cipherchar,fp2);ch=fgetc(fpl);printf("%c",ch);}write_file("Stream.txt",data_Stream,size);}/*解密總函數(shù)刃voidDataDecrypt(unsignedchar*k1,unsignedchar*key,unsignedchar*sbox,FILE*fp1,FILE*fp2){intlen=strlen(kl);KeyExpansion(key,k1,len);InitSbox(sbox);

UpsetSbox(sbox,key);printf("\n密文為：")；DataProcess(sbox,fp1,fp2);fclose(fpl);fclose(fp2);printf("\n解密成功，內(nèi)容存于“jiemi.txt”中!\n\n");}/*******文件的寫操作**********/intwrite_file(charname[],chardata[],intsize){FILE*file=fopen(name,"ab+");if(file==NULL)return0;fwrite(data,sizeof(char),size,file);//寫入一個數(shù)組rewind(file);//移動指針到開頭fclose(file);return1;}/******文件的操作*******/intread_file(unsignedcharname[],chardata[],intsize){FILE*file=fopen(name,"rb+");if(file==NULL)return0;rewind(file);//移動指針到開頭fread(data,sizeof(char),size,file);//讀出一個數(shù)組fclose(file);return1;}/**********B端通過Ya計算Kb*************/intuserb(alpha,q)intk2=pow(Ya,Xb);k2=k2%q;returnk2;intmain(intargc,constchar*argv[]){intq=11,alpha=2;intKb;unsignedcharkey1[25]={0x00},key2[25]={0x00};unsignedcharkey[256]={0x00};unsignedcharsbox[256]={0x00};FILE*fp1,*fp2;intflag=1,i;printf("B用戶端\n");printf("q=11,a=2\n");//CalculatingYbYb=pow(alpha,Xb);Yb=Yb%q;printf("計算得到Y(jié)b=%d\n",Yb);printf("請輸入A端的公鑰Ya:");scanf("%d",&Ya);Kb=userb(alpha,q);printf("計算得到最終秘鑰K=%d\n",Kb);key2[0]=Kb;/*********解密**********/fp1=fopen("miwen.txt","r");if(fp1==NULL){printf（"打開加密后文件失敗!\n"）;getchar();exit(0);fp2=fopen("jiemi.txt","w");if(fp2==NULL){printf（"打開解密后文件失敗!\n"）;getchar();exit(0);實圖1R用戶端q=1La=2計算得到Y(jié)b=10齒輸入A端的公胡Ya:A用戶端q=ll,a=2計算得到Y(jié)a.=8請輸入B端的公鑰Yb：A用戶端q=llJa=2計算得到Y(jié)?=8請輸入E端的公鑰Yb：10計算得到最終公鑰K=10明文為engChunHui加密成功,加密內(nèi)容在;KmiwerLtxt"中PressanykeytocontinueB用戶端q二11,a二2計算得到Y(jié)b=10詰輸Xa端的公鑰Ya:8十算廿到最河秘竊K=l。密文為：荏龍??u浚。鄙：0?解密成功，內(nèi)容薦于"jiemi.txt”中!Pressanykeytocontinue1(圖2)

存儲明文的文件（圖3）：mingwen.ttt-記事本文件出相露回格式。查窗切努助（W|180345301B7DengChunHui圖3存儲密文的文件（圖4）：miwen.txt-記事本文件舊編輯㈤梏式⑼筐看M幫助（HJ榛臬€??U浚3\鄢！0?圖4解密后的文件（圖5）：jiemi.tx