Question

Pin Encryption

Write a block of source code to encrypt a four digit pin number by doing the following: 1. Convert the pin number to hexadecimal. 2. Generate two random numbers greater than 1000 and convert them to hexadecimal. 3. Sandwich the converted pin between the two random hexadecimal numbers. Sample Output: Enter a 4 digit pin number to encrypt: 8491 Your encrypted pin number is 1787212b12ef

Answer 1

import java.util.*;
import java.math.*;
public class HexEncrypt
{
public static void main(String arg[])
{
int n, n1,n2;
String encrypt;
System.out.print("Enter a 4 digit pin to encrypt: ");
Scanner s = new Scanner(System.in);
n=s.nextInt();

//System.out.println("\n "+Integer.toHexString(n));

Random rand = new Random();
n1 = rand.nextInt((9999-1000)+1)+1000; // Generate random number between 1000 and 99999
n2 = rand.nextInt((9999-1000)+1)+1000;

encrypt=Integer.toHexString(n1)+Integer.toHexString(n)+Integer.toHexString(n2);

System.out.println("\n Your encrypted pin number is: "+encrypt);
}
}