版权声明：转载请注明出处。 https://blog.csdn.net/u014427196/article/details/48686543

Vigenere密码代码：

#include <stdio.h>
#include <iostream>
#include <math.h>
#include <stdlib.h>
#include <ctype.h>
#include <algorithm>
#include <vector>
#include <string.h>
#include <string>
#include <queue>
#include <stack>
#include <set>
#include <sstream>
#include <time.h>

using namespace std;

char clear_text[10000];
string ans;
char key[10000];

int main()
{
    memset(key, 0, sizeof(key));
    ans.clear();

    int m;
    printf("please enter m :");
    scanf("%d", &m);
    printf("please enter key :");
    scanf("%s", &key);
    printf("please enter the clear_text :");
    scanf("%s", clear_text);
    int len = strlen(clear_text);

    for (int i = 0;i < len;i++)
    {
        int pos = i;
        for (int j = 0;j < m;j++)
        {
            int tmp = (clear_text[pos++] - 'a' + key[j] - 'a') % 26;
            ans += (char)(tmp + 'a');
        }
        i = i + m - 1;
    } 
    cout << ans << endl;
    return 0;
}
/*
5
hello
university
*/

Hill:

#include <stdio.h>
#include <ctime>
#include <math.h>
#include <limits.h>
#include <complex>
#include <string>
#include <functional>
#include <iterator>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <list>
#include <bitset>
#include <sstream>
#include <iomanip>
#include <fstream>
#include <iostream>
#include <ctime>
#include <cmath>
#include <cstring>
#include <cstdio>
#include <time.h>
#include <ctype.h>
#include <string.h>
#include <string>
#include <assert.h>

using namespace std;

int m;
int mat[510][510];
char clear[1000];
string ans;

int main()
{
    memset(mat, 0, sizeof(mat));
    ans.clear();

    printf("please enter m :");
    scanf("%d",&m);

    printf("please enter key_mat :");
    for (int i = 0;i < m;i++)
        for (int j = 0;j < m;j++)
            scanf("%d", &mat[i][j]);

    printf("please enter the clear_text :");
    scanf("%s", clear);

    int len = strlen(clear);
    int pos = 0;
    for (int i = 0;i < len;i++)
    {
        string tmp;
        tmp.clear();
        for (int j = i;j < i + m;j++) tmp += clear[j];

        int pos = 0;
        int cnt = 0;
        for (int j = 0;j < m;j++)
        {
            cnt = 0;
            int t2 = 0;
            for (int k = 0;k < m;k++)
            {
                int t1 = tmp[cnt++] - 'a';
                t2 += mat[k][pos] * t1;
            }
            t2 %= 26;
            ans += (char)(t2 + 'a');
            pos++;
        }
        i = i + m - 1;
    }
    cout << ans << endl;
    return 0;
}
/*
2
11 8 3 7
hill
*/