Sending Java Sealed Objects via Sockets

Client.java

import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
import java.security.spec.*;
import java.security.*;

public class Client {

    public static void main(String[] args) throws Exception {
	
		String server = "localhost";
		
		if(args.length == 1){
			server = args[0];
		}
	
    	System.out.println("Receiver Started");
		
		// Create key
		final char[] password = "secret_password".toCharArray();
		final byte[] salt = "random_salt".getBytes();
		SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
		KeySpec spec = new PBEKeySpec(password, salt, 1024, 128);
		SecretKey tmp = factory.generateSecret(spec);
		SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");

		Cipher cipher = Cipher.getInstance("AES");
		cipher.init(Cipher.ENCRYPT_MODE, secret);			

    	SocketChannel sChannel = SocketChannel.open();
    	sChannel.configureBlocking(true);
		
    	if (!sChannel.connect(new InetSocketAddress(server, 12345))) {
			System.out.println("Cannot connect to Server, make sure it is running");
		}
			
		ObjectOutputStream  oos = new ObjectOutputStream(sChannel.socket().getOutputStream());

		SecretObject secretObject = new SecretObjectImpl("007");

		SealedObject so = new SealedObject(secretObject, cipher);

		oos.writeObject(so);
		System.out.println("Sent Sealed Object");

		oos.close();    	

    	System.out.println("End Receiver");
    }
}

SecretObject.java

import java.io.*;

public interface SecretObject extends Serializable {
	  String getSecretMessage();
}

SecretObjectImpl.java

import java.io.*;

public class SecretObjectImpl implements SecretObject {
	
	private String _secretMessage = "";
	
	public SecretObjectImpl(String secretMessage) {
		_secretMessage = secretMessage;
	}

	public String getSecretMessage() {
		return _secretMessage;
    }

}

Server.java

import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
import java.security.spec.*;
import java.security.*;

public class Server {		
	
		
    public static void main(String[] args) throws Exception {
    	System.out.println("Server Started");
		
		// Create key
		final char[] password = "secret_password".toCharArray();
		final byte[] salt = "random_salt".getBytes();
		SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
		KeySpec spec = new PBEKeySpec(password, salt, 1024, 128);
		SecretKey tmp = factory.generateSecret(spec);
		SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");

		Cipher dcipher = Cipher.getInstance("AES");
		dcipher.init(Cipher.DECRYPT_MODE, secret);			

    	ServerSocketChannel ssChannel = ServerSocketChannel.open();
    	ssChannel.configureBlocking(true);
    	int port = 12345;
    	ssChannel.socket().bind(new InetSocketAddress(port));

    	while (true) {
			System.out.println("Waiting for a connection...");
    		SocketChannel sChannel = ssChannel.accept();

			System.out.println(sChannel.getRemoteAddress().toString() +" connected");
    		
			ObjectInputStream ois = new ObjectInputStream(sChannel.socket().getInputStream());

			SealedObject s = (SealedObject)ois.readObject();
			
			SecretObject decryptedSecretObject = (SecretObject) s.getObject(dcipher);    	
			
    		System.out.println("Server - Packet Data is: '" + decryptedSecretObject.getSecretMessage() + "'");
			
			ois.close();

    		System.out.println("Connection ended");
    	}
    }
}