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State machine replication is a popular approach to increasing the availability of computer services. While it has been largely studied in the presence of crash-stop failures and malicious failures, all existing state machine replication protocols that provide byzantine fault-tolerance implement some variant of atomic broadcast. In this context, this paper makes two contributions. First, it presents the first byzantine fault-tolerant generic broadcast protocol. Generic broadcast is more general than atomic broadcast, in that it allows applications to deliver commutative commands out of order - delivering a command out of order can be done in fewer communication steps than delivering a command in the same order. Second, the paper presents an efficient state machine replication protocol that tolerates byzantine failures.
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