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    Steward: Scaling Byzantine Replication to Wide-Area Networks

Overview

Steward is a hierarchical Byzantine fault-tolerant replication system developed as part of DARPA's Self-Regenerative Systems project. The system is suited to deployments consisting of multiple wide-area sites, each with a cluster of replication servers. Steward continues to work correctly even if some of the replication servers in each site are compromised and act in an arbitrary manner.

Steward deploys a hierarchical architecture. Each site runs local Byzantine fault-tolerant protocols to confine the effects of malicious replias to their local site. Thus, each site acts as a trusted logical unit. A benign fault-tolerant replication protocol runs among the logical units over the wide-area network.

Contributors

  • Johns Hopkins University
    • Yair Amir
    • Claudiu Danilov
    • Jonathan Kirsch
    • John Lane
  • Purdue University
    • Cristina Nita-Rotaru
    • Josh Olsen
    • David Zage
  • The Hebrew University
    • Danny Dolev

Funding

Our work on Steward was partially funded by the Defense Advanced Research Project Agency (contract FA8750-04-2-0232), and by the National Science Foundation (grants 0430271 and 0430276).

Software

Steward was fully implemented and underwent a Red Team evaluation in December 2005. The code was written in C and runs on Linux.

License

Steward may be freely used and distributed under some conditions. Please review the license agreement for more details.

Download

Source code can be downloaded here.

Related Publications


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