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Group communication security is needed to protect sensitive information. A group key is shared by all users under secure group communication model. The group key is used to encrypt data transmitted to the group. The group membership is dynamic and requires new key for membership changes. Secure multicast transmission schemes are used to transfer data to a set of nodes. Membership in secure multicast groups is dynamic and requires multiple updates in a single time frame. Storage cost and re-keying cost are considered in the secure multicast transmission. The system manages long standing members and shortly lived members separately.
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