Abstract
Previous solutions to the problem of synchronising fault-tolerant multiprocessor systems require either 3t+1 processors (for t-fault-tolerance) or else multiple rounds of messages with unforgeable digital signatures. These solutions are too expensive for small microprocessor-style control systems. The paper shows that simple constraints on the physical design of the communication links permit a much more economical solution with just 2t+1 processors and one round of messages, without the need for unforgeable signatures.
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