如何从vigenere转换为Columnar密码？ [英] How convert from vigenere to Columnar cipher ?

问题描述

如何将此代码从Vigenere Cipher转换为Columnar密码？

How convert this code from Vigenere Cipher to Columnar cipher?

 package vigenere;
import java.util.Scanner;
public class VigenereCipher {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Please enter the key (ONLY CAPITAL LETTERS WITHOUT SPACE)");
        String key = input.nextLine();
        System.out.println("Please enter the text");
        String plainText = input.nextLine(); 
        String e = encryption(plainText, key);
        System.out.println("encryption text is:");
        System.out.println(e);
        System.out.println("decryption text is:");
        System.out.println(decryption(e, key));
    }
 
    static String encryption(String plainText,  String key) {
        String empty = "";
        plainText = plainText.toUpperCase();
        for (int i = 0, j = 0; i < plainText.length(); i++) {
            char x = plainText.charAt(i);
            if (x < 'A' || x > 'Z') {};
            empty += (char)((x + key.charAt(j) - 2 * 'A') % 26 + 'A');
            j = ++j % key.length();
        }
        return empty;
    }
 
    static String decryption(String plainText,  String key) {
        String empty = "";
        plainText = plainText.toUpperCase();
        for (int i = 0, j = 0; i < plainText.length(); i++) {
            char x = plainText.charAt(i);
            if (x < 'A' || x > 'Z') {};
            empty += (char)((x - key.charAt(j) + 26) % 26 + 'A');
            j = ++j % key.length();
        }
        return empty;
    }
}

推荐答案

这个问题似乎没有意义。你不能转换代码。你可能只需要实现 Columnar Transposition Cipher （我想知道为什么）：

http://en.wikipedia.org/wiki/Transposition_cipher [ ^ ]。

-SA

The question does not seem to make sense. You cannot "convert" code. You probably simply need the implementation of Columnar Transposition Cipher (I wonder why):
http://en.wikipedia.org/wiki/Transposition_cipher[^].

—SA

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