PBFT vs Proof-of-Authority: Applying the CAP Theorem to Permissioned Blockchain

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A Deep Blockchain Framework-Enabled Collaborative Intrusion Detection for Protecting IoT and Cloud Networks (2021, methodology): “Third, PBFT is a popular consensus protocol currently being implemented in Hyperledger Fabric [20].”
The Energy Consumption of Blockchain Technology: Beyond Myth (2020, background): “The term PoA usually involves different levels of security, from mathematically proven and long-established, fully fault-tolerant mechanisms (Paxos, PBFT) over heuristically-secure algorithms, such as Istanbul BFT and Aura, to basic crash-tolerant mechanisms such as RAFT (De Angelis et al. 2017).”
Blockchain for Future Smart Grid: A Comprehensive Survey (2019, background): “Proof of Authority (PoA): The PoA [53] is designed particularly for permissioned blockchain.”
A Comprehensive Review of Blockchain Consensus Mechanisms (2021, background): “Moreover, the procedure of discerning authorities results in the centralized conﬁguration of PoA, which makes this approach appropriate for private consortiums [63], [110].”
Blockchain for AI: Review and Open Research Challenges (2019, background): “A PoA protocol works by delegating authoritative control to specific nodes that collectively form the consensus based on majority votes to create new blocks on the network [100].”