International Association
for Cryptologic Research

Asynchronous Byzantine fault-tolerant (BFT) protocols have received increasing attention, as they are particularly robust against timing and performance attacks. This paper designs and implements Dory, an asynchronous BFT protocol with reduced communication and improved efficiency compared to existing systems. In particular, Dory reduces the communication both asymptotically and concretely and gains in improved performance. To achieve the goal, we have devised a novel primitive called asynchronous vector data dissemination, and we have developed the idea of supplemental consensus originally used in DispersedLedger for higher throughput and fairness without using threshold encryption.

We have implemented and deployed our system using up to 151 replicas on Amazon EC2. We demonstrate that even without using the technique of separating data transmission from agreement, Dory has up to 5x the throughput of Speeding Dumbo (sDumbo), while lowering the communication cost for different batch sizes.