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維吉尼亞密碼c語言求改。
#include stdlib.h
#include stdio.h
#include string.h
#define N 10000
void function(char message[],char key[],int mode); //加解密函數
int main()
{
int choose;
char m[N],key[N];
printf(“維吉尼亞加密，請輸入1；解密，請輸入2：\n”);
scanf(“%d”,choose);
getchar();
if (choose == 1 || choose == 2)
{
if (choose == 1)
printf(“輸入明文:\n”);
if (choose == 2)
printf(“輸入密文:\n”);
gets(m);
printf(“輸入密鑰:\n”);
gets(key);
function(m,key,choose);
}
else
printf(“輸入錯誤！\n”);
return 0;
}
void function(char message[],char key[],int mode) //加解密函數
{
int i, j = 0; //j控制key的輪迴
int len_k = strlen(key); //密鑰長度
char s[N];
for(i=0; message[i]!=’\0′; i++)
{
if(message[i] == 32) //判斷空格
s[i]=’ ‘;
else
{
if (mode == 1)
s[i]=(int(message[i]-‘a’)+int(key[j%len_k]-‘a’))%26+97;
if (mode == 2)
s[i]=(int(message[i]-‘a’)-int(key[j%len_k]-‘a’)+26)%26+97;
j++;
}
printf(“%c”,s[i]);
}
printf(“\n”);
}
gets(l);//不加這句M就輸入不了為什麼？
是因為沒有這句的話，按的回車鍵就輸成m了。
連用兩個輸入語句時，需要考慮回車鍵，就像我代碼里的getchar()。
維吉尼亞密碼 C++
給，網上的C++的基本都有問題，我給你改好一個，已經編譯運行確認，
#includeiostream
using namespace std;
#define MINCHAR 32
#define CHARSUM 94
char table[CHARSUM][CHARSUM];
bool Init();
bool Encode(char* key, char* source, char* dest);
bool Dncode(char* key, char* source, char* dest);
int main()
{
if(!Init())
{
cout “初始化錯誤！” endl;
return 1;
}
char key[256];
char str1[256];
char str2[256];
int operation;
while(1)
{
do
{
cout “請選擇一個操作：1. 加密； 2. 解密； -1. 退出\n”;
cin operation;
}while(operation != -1 operation != 1 operation != 2);
if(operation == -1)
return 0;
else if(operation == 1)//加密
{
cout “請輸入密鑰：”;
cin key;
cout “請輸入待加密字符串：”;
cin str1;
Encode(key, str1, str2);
cout “加密後的字符串：” str2 endl;
}
else if(operation == 2)//解密
{
cout “請輸入密鑰：”;
cin key;
cout “請輸入待解密字符串：”;
cin str1;
Dncode(key, str1, str2);
cout “解密後的字符串：” str2 endl;
}
cout endl;
}
return 0;
}
// 初始化維吉尼亞方陣
bool Init()
{
int i, j;
for(i = 0; i CHARSUM; i++)
{
for(j = 0; j CHARSUM; j++)
{
table[i][j] = MINCHAR + (i + j) % CHARSUM;
}
}
return true;
}
// 加密
// key：密鑰
// source：待加密的字符串
// dest：經過加密後的字符串
bool Encode(char* key, char* source, char* dest)
{
char* tempSource = source;
char* tempKey = key;
char* tempDest = dest;
do
{
*tempDest = table[(*tempKey) – MINCHAR][(*tempSource) – MINCHAR];
tempDest++;
if(!(*(++tempKey)))
tempKey = key;
}while(*tempSource++);
dest[strlen(source)] = 0;
return true;
}
// 解密
// key：密鑰
// source：待解密的字符串
// dest：經過解密後的字符串
bool Dncode(char* key, char* source, char* dest)
{
char* tempSource = source;
char* tempKey = key;
char* tempDest = dest;
char offset;
do
{
offset = (*tempSource) – (*tempKey);
offset = offset = 0 ? offset : offset + CHARSUM;
*tempDest = MINCHAR + offset;
tempDest++;
if(!(*(++tempKey)))
tempKey = key;
}while(*++tempSource);
dest[strlen(source)] = 0;
return true;
}
寫一個維吉尼亞加密和解碼的C語言程序，具體要求如下。不要用GOTO， 不要有MAGIC NUMBER。
#include stdio.h
#define MINCHAR 32
#define CHARSUM 94
int encode(char* key, char* source, char* dest);
int decode(char* key, char* source, char* dest);
char table[CHARSUM][CHARSUM];
int main()
{
int i, j;
char key[256];
char source[256];
char destination[256];
int operation;
FILE *fp;
/* Initial the Vigenere table */
for(i = 0; i CHARSUM; i++)
for(j = 0; j CHARSUM; j++)
table[i][j] = MINCHAR + (i + j) % CHARSUM;
printf(“please choose one operation code:\n”);
printf(“1. Encode; 2. Decode; Others. Exit.\n”);
scanf(“%d”, operation);
fflush(stdin);
switch (operation)
{
case 1:
printf(“please input the key code:\n”);
gets(key);
fflush(stdin);
printf(“please input the source code you want to encode:\n”);
gets(source);
fflush(stdin);
encode(key, source, destination);
printf(“after encode is: \n”);
printf(“%s\n”, destination);
fp=fopen(“key.txt”, “w”);
fprintf(fp, “%s”, key);
fclose(fp);
fp=fopen(“source.txt”, “w”);
fprintf(fp, “%s”, source);
fclose(fp);
fp=fopen(“destination.txt”, “w”);
fprintf( fp, “%s”,destination);
fclose(fp);
break;
case 2:
printf(“please input the key code:\n”);
gets(key);
fflush(stdin);
printf(“please input the source code you want to decode:\n”);
gets(source);
fflush(stdin);
decode(key, source, destination);
printf(“after decode is: \n”);
printf(“%s\n”, destination);
fp=fopen(“key.txt”, “w”);
fprintf(fp, “%s”, key);
fclose(fp);
fp=fopen(“source.txt”, “w”);
fprintf(fp, “%s”, source);
fclose(fp);
fp=fopen(“destination.txt”, “w”);
fprintf(fp, “%s”, destination);
fclose(fp);
break;
default:
return 0;
}
return 0;
}
int encode(char* key, char* source, char* dest)
{
char* tempSource = source;
char* tempKey = key;
char* tempDest = dest;
do
{
*tempDest = table[(*tempKey) – MINCHAR][(*tempSource) – MINCHAR];
tempDest++;
if (!(*(++tempKey)))
tempKey = key;
} while(*tempSource++);
dest[strlen(source)] = ‘\0’;
return 1;
}
int decode(char* key, char* source, char* dest)
{
char* tempSource = source;
char* tempKey = key;
char* tempDest = dest;
char offset;
do
{
offset = (*tempSource) – (*tempKey);
offset = offset = 0 ? offset : offset + CHARSUM;
*tempDest = MINCHAR + offset;
tempDest++;
if (!(*(++tempKey)))
tempKey = key;
} while(*++tempSource);
dest[strlen(source)] = ‘\0’;
return 1;
}
(c語言)求密碼
360問答
求古典密碼學的c語言代碼
guiyids0033 LV122014-01-16
各位高手小弟急需一個維吉尼亞密碼的程序。幫幫忙
滿意答案

aa7777777777qq
LV12
2014-01-16
給： 維吉尼亞密碼的C語言源代碼 設m表示明文序列，k表示密鑰序列 #include ctype.h #include stdio.h #include stdlib.h #include string.h #include conio.h void crypt(char m[],char k[],char r[]) { int i,j,s=0; j=strlen(k); for(i=0;m[i];i++) m[i]=tolower(m[i]); for(i=0;m[i];i++) if(isalpha(m[i])) { r[i]=(m[i]-‘a’+k[s%j]-‘a’)%26+’a’; s++;/* s用來跳過明文中的空格字符 */ } else r[i]=m[i]; r[i]=0;/* 密文字符串結束符 */ for(i=0;r[i];i++) r[i]=toupper(r[i]); } void decrypt(char c[],char k[],char m[]) { int i,j,s=0; j=strlen(k); for(i=0;c[i];i++) c[i]=tolower(c[i]); for(i=0;c[i];i++) if(isalpha(c[i])) { m[i]=(c[i]-k[s%j]+26)%26+’a’; s++; } else m[i]=c[i]; m[i]=0; } void main() { char m[]=”welcome to my blog.i am bugeyes.”;//我這裡是賦值了一個固定的字符串為明文序列，你也可以做成用戶輸入的 char k[]=”bugeyeswuyan”;//我這裡是賦值了一個固定的字符串為密鑰序列，你也可以做成用戶輸入的 char c[80]; char d[80]; system(“cls”);; crypt(m,k,c); decrypt(c,k,d); puts(m); puts(k); puts(c); puts(d); }
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