docs: def encrypt(self, recipient_id, message):
          logger.debug("encrypt(recipientid=%s, message=%s)" % (recipient_id, message))
          """
          :param recipient_id:
          :type recipient_id: str
          :param data:
          :type data: bytes
          :return:
          :rtype:
          """
          cipher = self._get_session_cipher(recipient_id)
          return cipher.encrypt(message + self._generate_random_padding())