A SYSTEM SECURING MULTICAST AND BROADCAST COMMUNICATIONS BETWEEN THE BASE STATION AND MOBILE STATIONS IN A WIRELESS METROPOLITAN AREA NETWORK

摘要

A system and a method for securing multicast and broadcast communications between the Base Station (BS) and Subscriber Stations (SS) in a wireless metropolitan area network are disclosed. The present invention prevents the distribution of forged key update command messages by an adversary SS in Multicast and Broadcast service by avoiding broadcast key updates. The GTEKs are generated as part of a hash chain. GTEKs are generated applying a one-way function to the previous GTEKs. This hash chain enables verification of each GTEK by application of the same one-way function to the previous GTEK at each SS.