Intrusion-Tolerant Group Management for Mobile Ad-Hoc Networks
نویسندگان
چکیده
This paper presents PICO, a distributed protocol that manages group membership and keying in mobile adhoc networks (MANETs). PICO tolerates a limited number of Byzantine nodes and an additional limited number of crashed nodes. It allows clients to join or leave a dynamically changing group and provides group members with a dynamically updated group encryption key. Since MANETs are characterized by relatively high message loss and frequent network partitions, PICO is built around a new Byzantine fault-tolerant agreement protocol designed to cope with these conditions. The agreement protocol leverages weak (commutative) semantics to allow multiple partitions to continue operating in parallel without sacrificing correctness; it also copes well with unreilable communication links because it uses cumulative messages instead of needing the retransmission of prior lost messages.
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