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Asymmetric distributed trust.

Orestis Alpos1,2, Christian Cachin3, Björn Tackmann4

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Summary
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This study introduces asymmetric Byzantine quorum systems, a novel approach to modeling subjective trust in distributed computing. This generalization allows for more flexible and realistic trust assumptions in fault-tolerant systems.

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Area of Science:

  • Distributed computing
  • Fault-tolerant systems
  • Theoretical computer science

Background:

  • Quorum systems are fundamental in distributed computing for managing trust and fault tolerance.
  • Existing Byzantine quorum systems rely on a single, global trust assumption for all processes.

Purpose of the Study:

  • To introduce asymmetric Byzantine quorum systems (ABQS) that model subjective trust.
  • To generalize standard Byzantine quorum systems by allowing individual trust assumptions.
  • To present protocols for shared memory, broadcast, and consensus under ABQS.

Main Methods:

  • Formal definition of asymmetric Byzantine quorum systems.
  • Development of protocols for shared memory, broadcast, and consensus tailored for ABQS.
  • Analysis of protocols under Byzantine faults and asymmetric trust models.

Main Results:

  • Asymmetric Byzantine quorum systems strictly generalize standard Byzantine quorum systems.
  • Protocols for key distributed computing abstractions (shared memory, broadcast, consensus) are presented.
  • The model and protocols demonstrate feasibility of implementing algorithms with asymmetric trust.

Conclusions:

  • Asymmetric Byzantine quorum systems offer a more realistic trust model for distributed systems.
  • The proposed protocols enable fault-tolerant distributed computing with subjective trust assumptions.
  • This work provides a foundation for more complex algorithms incorporating asymmetric trust.