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In order to securely transmit data packets in a mobile environment where frequent join/leave events are a characteristic of the environment, there is a need for a new secure and efficient group key management solution. The authors propose a secure group key generation/distribution solution providing scalability as well as reliability. With this solution, when a mobile node, which is in a multicast session, enters a new subnet, the agent of the subnet joins the multicast session and coordinates its data packets with the mobile node.
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