import java.io.File;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SealedObject;
import javax.crypto.SecretKey;
public class Main {
private static void writeToFile(String filename, Object object) throws Exception {
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File(filename)));
oos.writeObject(object);
oos.flush();
oos.close();
}
public static void main(String[] args) throws Exception {
SecretKey key = KeyGenerator.getInstance("DES").generateKey();
writeToFile("secretkey.dat", key);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
SealedObject sealedObject = new SealedObject("THIS IS A SECRET MESSAGE!", cipher);
writeToFile("sealed.dat", sealedObject);
}
}