维吉尼亚密码java

package Vigenere;

import java.util.Scanner;

public class MyVigenere

{

/**

* @param args

*/

public static void encryption(char [] plaintext,char [] key,int p,int k)

{

char []key1;

char []ciphertext;

ciphertext=new char[p];

if(p>k)

{

key1=new char[p];

for(int i=0;i

{

key1[i]=key[i%k];

}

}

else

{

key1=new char[p];

for(int i=0;i

{

key1[i]=key[i];

}

}

for(int i=0;i

{

ciphertext[i]= (char) (((plaintext[i]-'a')+(key1[i]-'a'))%26+'a');

System.out.print(ciphertext[i]);

}

}

public static void main(String[] args)

{

// TODO Auto-generated method stub

System.out.println("请输入明文：");

Scanner scank=new Scanner(System.in);

char []plaintext=scank.next().toCharArray();

System.out.println("请输入密钥：");

Scanner scanp=new Scanner(System.in);

char []key=scanp.next().toCharArray();

int p=plaintext.length;

int k=key.length;

System.out.println("密文为：");

encryption(plaintext,key,p,k);

}

}