Consensus When All Processes May Be Byzantine for Some Time

  • Authors:
  • Martin Biely;Martin Hutle

  • Affiliations:
  • Ecole polytechnique, Palaiseau Cédex, France 91128 and Embedded Computing Systems Group (182/2), TU Wien, Wien, Austria 1040;Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland 1015

  • Venue:
  • SSS '09 Proceedings of the 11th International Symposium on Stabilization, Safety, and Security of Distributed Systems
  • Year:
  • 2009

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Abstract

Among all classes of faults, Byzantine faults form the most general modeling of value faults. Traditionally, in the Byzantine fault model, faults are statically attributed to a set of up to t processes. This, however, implies that in this model a process at which a value fault occurs is forever "stigmatized" as being Byzantine, an assumption that might not be acceptable for long-lived systems, where processes need to be reintegrated after a fault. We thus consider a model where Byzantine processes can recover in a predefined recovery state, and show that consensus can be solved in such a model.