def _unseal_message(self, message):
decrypted_message = self.incoming_handle.update(message)<EOL>return decrypted_message<EOL>
[MS-NLMP] v28.0 2016-07-14

3.4.3 Message Confidentiality
Will generate a dencrypted message using RC4 based on the
ServerSealingKey

:param message: The message to be unsealed (dencrypted)
:return decrypted_message: The decrypted message