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Decryption.java

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/* package whatever; // */

import java.util.*;

import java.lang.*;

import java.io.*;

class Decryption

{

public static void main (String[] args) throws java.lang.Exception

{

/* The cipher you received from encryption */

String s = "1B151511584E461A0B07020F16410C0002400C0C163E0B57";

int len = s.length();

byte[] r = new byte[len / 2];

for (int i = 0; i < r.length; i++) {

int digit1 = s.charAt(i * 2), digit2 = s.charAt(i * 2 + 1);

if (digit1 >= '0' && digit1 <= '9')

digit1 -= '0';

else if (digit1 >= 'A' && digit1 <= 'F')

digit1 -= 'A' - 10;

if (digit2 >= '0' && digit2 <= '9')

digit2 -= '0';

else if (digit2 >= 'A' && digit2 <= 'F')

digit2 -= 'A' - 10;

r[i] = (byte) ((digit1 << 4) + digit2);

}

String newStr = new String(r, "UTF-8");

String key = "sambosivasambo";

char[] msg = newStr.toCharArray();

char temp;

StringBuilder cipher = new StringBuilder();

for(int i=0, l = msg.length, l1 = key.length()-1; i < l; i++) {

temp = key.charAt(l1 % (i+1));

cipher.append((char)(temp ^ msg[i]));

}

System.out.println(" cipher : " + cipher.toString());

}

}