import java.io.*;
import javax.crypto.*;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
      
   
public class DES {

   
    public static void main(String[] args) {
       
        try{
            
            String st = "Hello";
            System.out.println("Real String: " + st);
                     
            byte str[]= st.getBytes();
            Cipher c= Cipher.getInstance("DES");
            KeyGenerator kg =KeyGenerator.getInstance("DES");
            SecretKey sk= kg.generateKey();
            
            //encrypt mode
            c.init(Cipher.ENCRYPT_MODE, sk);
            byte ct[]= c.doFinal(str);
            System.out.println("ENCRYPT_MODE DATA : " + new String(ct));
            
            //decrypt mode
            c.init(Cipher.DECRYPT_MODE, sk);
            byte ct1[]= c.doFinal(ct);
            System.out.println("DECRYPT_MODE DATA : "  + new String(ct1));
            
            
            
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
        
        
    }
    
}