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Byzantine fault-tolerant agreement (BFT) in a partially synchronous systemusually requires 3f + 1 nodes to tolerate f faulty replicas. Due to their highthroughput and finality property BFT algorithms build the core of recentpermissioned blockchains. As a complex and resource-demanding infrastructure,multiple cloud providers have started offering Blockchain-as-a-Service. Thiseases the deployment of permissioned blockchains but places the cloud providerin a central controlling position, thereby questioning blockchains' faulttolerance and decentralization properties and their underlying BFT algorithm.This paper presents SplitBFT, a new way to utilize trusted execution technology(TEEs), such as Intel SGX, to harden the safety and confidentiality guaranteesof BFT systems thereby strengthening the trust in could-based deployments ofpermissioned blockchains. Deviating from standard assumptions, SplitBFTacknowledges that code protected by trusted execution may fail. We address thisby splitting and isolating the core logic of BFT protocols into multiplecompartments resulting in a more resilient architecture. We apply SplitBFT tothe traditional practical byzantine fault tolerance algorithm (PBFT) andevaluate it using SGX. Our results show that SplitBFT adds only a reasonableoverhead compared to the non-compartmentalized variant.

SplitBFT: Improving Byzantine Fault Tolerance Safety Using Trusted Compartments