(self, id_list)
host -> guest
        :param id_list:
        :return:
host -> guest
        :param id_list:
        :return:
host - > guest : param id_list : : return :
def _sync_doubly_encrypted_id_list(self, id_list):
        """
        host -> guest
        :param id_list:
        :return:
        """
        pass
def _sync_doubly_encrypted_id_list ( self , id_list ) : pass