Fast Asynchronous Consensus with Optimal Resilience


We give randomized agreement algorithms with constant expected running time in asynchronous systems subject to process failures, where up to a minority of processes may fail. We consider three types of process failures: crash, omission, and Byzantine. For crash or omission failures, we solve consensus assuming private channels or a publickey infrastructure, respectively. For Byzantine failures, we solve weak Byzantine agreement assuming a public-key infrastructure and a broadcast primitive called weak sequenced broadcast. We show how to obtain weak sequenced broadcast using a minimal trusted platform module. The presented algorithms are simple, have optimal resilience, and have optimal asymptotic running time. They work against a sophisticated adversary that can adaptively schedule messages, processes, and failures based on the messages seen by faulty processes.

DOI: 10.1007/978-3-642-15763-9_3

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@inproceedings{Abraham2010FastAC, title={Fast Asynchronous Consensus with Optimal Resilience}, author={Ittai Abraham and Marcos K. Aguilera and Dahlia Malkhi}, booktitle={DISC}, year={2010} }