Computation Efficient Multicast Key Distribution full report
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14-03-2010, 09:19 PM
Efficient key distribution is an important problem for secure group communications. The communication and storage complexity of multicast key distribution problem has been studied extensively. In this paper, we propose a new multicast key distribution scheme whose complexity is significantly reduced. Instead of using conventional encryption algorithms, the scheme employs MDS codes, a class of error control codes, to distribute multicast key dynamically. This scheme drastically reduces computation load of each group member compared to existing schemes employing traditional encryption algorithms. Such a scheme is desirable for many wireless applications where portable devices or sensors need to reduce their computation as much as possible due to battery power limitations. Easily combined with any key-tree based schemes, this scheme provides much lower computation complexity, while maintaining low and balanced communication complexity and storage complexity for secure dynamic multicast key distribution.
IN many applications, multicast is an efficient means of distributing data in terms of resources (such as network bandwidth, server computation, and I/O load) usage. The privacy of a multicast communication session is usually ensured using (symmetric) encryption. All the designated receivers or members in a multicast group share a session (encryption) key. In many applications, however, the multicast group membership changes dynamically, i.e., some new members are authorized to join a new multicast session, whereas some old members should be excluded. Thus, session keys shall change dynamically to ensure both forward secrecy and backward secrecy of multicast sessions. The forward secrecy is maintained if an old member who has been excluded from the current and future sessions cannot access the communication of the current and future sessions, and the backward secrecy is guaranteed if a new member of the current session cannot recover the communication data of past sessions. Each session thus needs a new key that is only known to the current session members, i.e., session keys need to be dynamically distributed to authorized session members.
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