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Issue No. 01 - January-March (2010 vol. 7)
ISSN: 1545-5971
pp: 80-93
Yair Amir , Johns Hopkins University, Baltimore
Claudiu Danilov , Boeing Phantom Works, Seattle
Danny Dolev , Hebrew University of Jerusalem, Jerusalem
Jonathan Kirsch , Johns Hopkins University, Baltimore
John Lane , Johns Hopkins University, Baltimore
Cristina Nita-Rotaru , Purdue University, West Lafayette
Josh Olsen , University of California, Irvine, Irvine
David Zage , Purdue University, West Lafayette
This paper presents the first hierarchical Byzantine fault-tolerant replication architecture suitable to systems that span multiple wide-area sites. The architecture confines the effects of any malicious replica to its local site, reduces message complexity of wide-area communication, and allows read-only queries to be performed locally within a site for the price of additional standard hardware. We present proofs that our algorithm provides safety and liveness properties. A prototype implementation is evaluated over several network topologies and is compared with a flat Byzantine fault-tolerant approach. The experimental results show considerable improvement over flat Byzantine replication algorithms, bringing the performance of Byzantine replication closer to existing benign fault-tolerant replication techniques over wide area networks.
Fault tolerance, scalability, wide area networks.

C. Nita-Rotaru et al., "Steward: Scaling Byzantine Fault-Tolerant Replication to Wide Area Networks," in IEEE Transactions on Dependable and Secure Computing, vol. 7, no. , pp. 80-93, 2008.
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