Communication satellites offer an efficient way to extend IP multicast services for groups in wide-area networks. This poses interesting challenges for routing and security. Satellite networks can have wired and wireless links and different link-layer technologies like Ethernet and ATM. For security,
Multicast is becoming an increasingly important transmission method on the Internet, since when deployed it uses resources more efficiently and enables scalable many-to-many communication. Providing security services, such as traffic confidentiality, for multicast communication is particularly problematic. The original multicast model implies
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