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Practical Byzantine Fault Tolerance

AppearsintheProceedingsoftheThird SymposiumonOperatingSystemsDesignandImpl ementation,New Orleans,USA,February1999 PracticalByzantineFaultToleranceMiguelCa stroandBarbaraLiskovLaboratoryforCompute rScience,MassachusettsInstituteofTechnol ogy,545 TechnologySquare, Cambridge, ,thealgorithmdescribedinthispaperis Practical :it worksinasynchronousenvironmentslike theInternetandincorporatesseveralimporta ntoptimizationsthatimprove thatourserviceis only3%slowerthana ,thenumberofsoftwareerrorsis ( ,arbitrary)behavior, new,practicalalgorithmforstatemachinerep lication[17, 34] totalofreplicasaresimultaneouslyfaulty. Thismeansthatclientseventuallyreceive repliestotheirrequestsandthoserepliesare correctaccordingto linearizability[14, 4].

The algorithm does not rely on synchrony to provide safety. Therefore, it must rely on synchrony to provide liveness; otherwise it could be used to implement consensus in an asynchronous system, which is not possible [9]. We guarantee liveness, i.e., clients eventually receive replies to their requests, provided at most 1

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