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With the rapid development of blockchain, Byzantine fault-tolerant protocolshave attracted revived interest recently. To overcome the theoretical bounds ofByzantine fault tolerance, many protocols attempt to use Trusted ExecutionEnvironment (TEE) to prevent equivocation and improve performance andscalability. However, due to the broken quorum intersection assumption causedby the reduction of the replica number, the improvement is mostly at the costof increased communication complexity which prevents existing TEE-basedprotocols to be applied to large-scale blockchain systems. In this paper, wepropose TBFT, an efficient Byzantine fault-tolerant protocol in the partialsynchrony setting, which has O(n) message complexity in both normal-case andview-change. Compared to previous protocols, TBFT uses TEE-assisted primitivesto limit more types of malicious behaviors of replicas rather than preventingequivocation only, thereby reducing the latency and communication complexity ofclients and replicas. Besides, we also introduce lightweight cryptographicprimitives including a novel leader election mechanism and an efficient votingmessage aggregation mechanism for better security and performance. We evaluateTBFT via systematic analysis and experiments, and the results show that TBFThas better performance and scalability compared to other protocols.

Efficient Byzantine Fault Tolerance using Trusted Execution Environment: Preventing Equivocation is only the Beginning