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The Synchronization Power (Consensus Number) of Access-Control Objects: the Case of AllowList and DenyList

Authors Davide Frey, Mathieu Gestin, Michel Raynal



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Author Details

Davide Frey
  • Inria, IRISA, CNRS, Université de Rennes, France
Mathieu Gestin
  • Inria, IRISA, CNRS, Université de Rennes, France
Michel Raynal
  • IRISA, Inria, CNRS, Université de Rennes, France

Acknowledgements

We wish to thank the anonymous reviewers for their insightful comments and remarks that led to significant improvements to our paper.

Cite AsGet BibTex

Davide Frey, Mathieu Gestin, and Michel Raynal. The Synchronization Power (Consensus Number) of Access-Control Objects: the Case of AllowList and DenyList. In 37th International Symposium on Distributed Computing (DISC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 281, pp. 21:1-21:23, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2023)
https://doi.org/10.4230/LIPIcs.DISC.2023.21

Abstract

This article studies the synchronization power of AllowList and DenyList objects under the lens provided by Herlihy’s consensus hierarchy. It specifies AllowList and DenyList as distributed objects and shows that, while they can both be seen as specializations of a more general object type, they inherently have different synchronization power. While the AllowList object does not require synchronization between participating processes, a DenyList object requires processes to reach consensus on a specific set of processes. These results are then applied to a more global analysis of anonymity-preserving systems that use AllowList and DenyList objects. First, a blind-signature-based e-voting is presented. Second, DenyList and AllowList objects are used to determine the consensus number of a specific decentralized key management system. Third, an anonymous money transfer algorithm using the association of AllowList and DenyList objects is presented. Finally, this analysis is used to study the properties of these application, and to highlight efficiency gains that they can achieve in message passing environment.

Subject Classification

ACM Subject Classification
  • Theory of computation → Distributed computing models
  • Security and privacy → Access control
  • Security and privacy → Pseudonymity, anonymity and untraceability
Keywords
  • Access control
  • AllowList/DenyList
  • Blockchain
  • Consensus number
  • Distributed objects
  • Modularity
  • Privacy
  • Synchronization power

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