Proving properties of the Chord protocol using the ASM formalism

Marinković, Bojan; Glavan, Paola; Ognjanović, Zoran

doi:10.1016/j.tcs.2018.10.025

Cited by 2 publications

(9 citation statements)

References 11 publications

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“…Having these notions, the paper [23] proves that the presented formalization of Chord consistently maintains the topological structure of rings and manipulates with distributes keys. In Section 4 we will explain that our model of BAC19 satisfies the mentioned constraints and that results from [23] hold also for BAC19.…”

Section: Abstract State Machinesmentioning

confidence: 79%

“…We also provide a brief review of Abstract State Machines, since they are used for proving properties of Chord. For more details, please see [7,16,21,23,25,31,32].…”

Section: Overlay Networkmentioning

confidence: 99%

“…The correctness and efficiency of the Chord's protocol lookup procedure was in the focus of several papers, e.g. [23,25,31,32]. In [11] the authors exploited the benefits of Chord, such as accelerating the lookup, and developed an energy efficient routing protocol for Wireless Sensor Networks, called CHEARP: Chord-based Hierarchical Energy-Aware Routing Protocol for Wireless Sensor Networks.…”

Section: Chord and Synapsementioning

confidence: 99%

“…More precisely, with respect to the specifications that are provided in [22,23], we need to introduce the following changes:…”

Section: Fig 3 Bac19 Federation Of Structural Overlay Networkmentioning

confidence: 99%

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Federating digital contact tracing using structured overlay networks

et al. 2022

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In this paper, we present a comprehensive, yet simple, extension to the existing systems used for Digital Contact Tracing in Covid-19 pandemic. The ex16 tension, called BubbleAntiCovid19 (BAC19), enables those systems, regardless of their underlying protocol, to enhance their sets of traced contacts and to improve the global fight against pandemic during the phase of opening borders and enabling more traveling. BAC19 is a Structured Overlay Network. Its protocol is inspired by the Chord and Synapse Structured Overlay Networks. We design the architecture of the Overlay Network Federation. We show that the federation can be used as a formal model of Forward Contact Tracing. BAC19 provides a fully exhaustive retrieving procedure thanks to avoiding search during peer churn. Furthermore, we give simulation results for the BAC19 system, the simulator written in Python.

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Section: Abstract State Machinesmentioning

confidence: 79%

“…We also provide a brief review of Abstract State Machines, since they are used for proving properties of Chord. For more details, please see [7,16,21,23,25,31,32].…”

Section: Overlay Networkmentioning

confidence: 99%

Section: Chord and Synapsementioning

confidence: 99%

“…More precisely, with respect to the specifications that are provided in [22,23], we need to introduce the following changes:…”

Section: Fig 3 Bac19 Federation Of Structural Overlay Networkmentioning

confidence: 99%

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Federating digital contact tracing using structured overlay networks

et al. 2022

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“…Other distributed system protocols have been formally studied using "highlevel" specification languages. For instance, Pastry was analyzed using TLA + [13]; similar work used Event-B [16] or ASM [12] to partly verify other protocols. However, these studies are limited to the verification of safety properties.…”

Section: Related Workmentioning

confidence: 99%

Mechanically Verifying the Fundamental Liveness Property of the Chord Protocol

Bodeveix

Brunel

Chemouil

et al. 2019

Lecture Notes in Computer Science

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Chord is a protocol providing a scalable distributed hash table over an underlying peer-to-peer network. It is very popular due to its simplicity, performance and claimed correctness. However, the original version of the Chord maintenance protocol, presented with an informal proof of correctness, was since then shown to be in fact incorrect. It is actually tricky to come up with a provably-correct version as the protocol combines data structures, asynchronous communication, concurrency, and fault tolerance. Additionally, the correctness property amounts to a form of stabilization, a particular kind of liveness property. Previous work only addressed automated proofs of safety; and pen-and-paper, or automated but much bounded, proofs of stabilization. In this article, we report on the first mechanized proof of the liveness property for Chord. Furthermore, our proof addresses the full parameterized version of the protocol, weakens previously-devised invariants and operating assumptions, and is essentially automated (requiring limited effort when manual assistance is needed).

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Proving properties of the Chord protocol using the ASM formalism

Cited by 2 publications

References 11 publications

Federating digital contact tracing using structured overlay networks

Federating digital contact tracing using structured overlay networks

Mechanically Verifying the Fundamental Liveness Property of the Chord Protocol

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