cipher.init(Cipher.ENCRYPT_MODE, encryptionKey);
        
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (CipherOutputStream cos = new CipherOutputStream(baos, cipher);
             ObjectOutputStream oos = new ObjectOutputStream(cos)) {
            oos.writeObject(handle);
        }
        
        Files.write(file, baos.toByteArray());
    }