How to improve the efficiency of key distribution is one of the emphases in the research area of satellite IP multicast
networks in recent years. This paper presents a novel framework based on layered principle. This scheme divides
original monolayer multicast key distribution structure into two layer, and makes rekeying modification happen only on
its encapsulated individual group layer. A modified LKH based on member behavior activity is also proposed to
decreases the amount of key update information transmission. So, this scheme can realize rapid rekeying by decreasing
message transmission amount via satellite links and saving limited bandwidth resources, so as to provide significant
performance gain for satellite multicast system. The simulation curves indicate that, compared with monolayer LKH
mechanism in satellite multicast, our proposal is definitely advantageous in the condition of frequent join-leave,
especially when the quantity of join member and leave member are about equal. So, it is concluded that the proposed
key distribution scheme can provide scalability and high performance for large dynamic satellite multicast.
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