Conversion problem

[Muneeb Kiani]

hi...

i'm trying to writre a code for RSA encryption decryption, i founf a code from net, its work well with BigInteger, but whun i use string it show different ourput... follwing is my code..

import java.math.BigInteger;
import java.security.SecureRandom;
public class Main {

    

    public static final BigInteger one = new BigInteger("1");
    public static final SecureRandom rs = new SecureRandom();

    private BigInteger privateKey;
    public BigInteger publicKey;
    private BigInteger modulus;

    public void RSAKey(int n){
        BigInteger p =  BigInteger.probablePrime(n/2, rs);
        BigInteger q = BigInteger.probablePrime(n/2, rs);
        BigInteger phi = (p.subtract(one)).multiply(q.subtract(one));

        modulus     = p.multiply(q);
        publicKey   = new BigInteger("65537");
        privateKey  = publicKey.modInverse(phi);


    }

    public BigInteger encrypt(BigInteger message){
     return message.modPow(privateKey, modulus);
    }

    public BigInteger decrypt(BigInteger message){
     return message.modPow(publicKey, modulus);
    }



    public static void main(String[] args) {
        Main m = new Main();
        m.RSAKey(10);
        //String msg = "Hello";
        char[] msg = {'h','e','l','l','o'};
       
        String smsg = new String(msg);
        System.out.println("Smsg"+smsg);
        byte[] test = smsg.getBytes();
        String test1 = new String(test);

        System.out.println("smsg"+smsg);
        System.out.println("test"+test);
        System.out.println("test1"+test1);
       BigInteger cc = new BigInteger(test);
      
        BigInteger cipher = m.encrypt(cc);
        BigInteger plain = m.decrypt(cipher);
        String msgg = new String(plain.toByteArray());
        System.out.println();
        System.out.println();
        System.out.println();
        
        System.out.println("Message"+cc);
        System.out.println("cipher"+cipher);
        System.out.println("decrypt"+plain);
        System.out.println("plantext"+msgg);


    }

}