METHOD FOR MANAGING KEYS FOR BROADCAST ENCRYPTION AND METHOD FOR TRANSMITTING MESSAGES USING BROADCAST ENCRYPTION

摘要

A method for managing keys for broadcast encryption includes a step of arranging a plurality of devices to correspond to the bottom nodes among top nodes, intermediate nodes, and bottom nodes arranged into a layer structure or a tree structure; a step of skipping settings for node key sets against first intermediate nodes among the intermediate nodes; a step of setting node key sets against second intermediate nodes and bottom nodes among the intermediate nodes; and a step of setting devices keys against the devices based on the node key sets against the bottom nodes and the second intermediate nodes.;COPYRIGHT KIPO 2014;[Reference numerals] (AA) Start; (BB) End; (S100) Arranging a plurality of devices to correspond to bottom nodes among a plurality of nodes arranged in a tree structure; (S200) Skipping the setting for node key sets against first intermediate nodes; (S300) Setting node key sets against second intermediate nodes and the bottom nodes; (S400) Setting devices keys against the devices based on the node key sets against the second intermediate nodes and the bottom nodes