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Shared-Dining: Broadcasting Secret Shares Using Dining-Cryptographers Groups

Authors :
Juri Dispan
David Mödinger
Franz J. Hauck
Institute of Distributed Systems
Universität Ulm - Ulm University [Ulm, Allemagne]
Miguel Matos
Fabíola Greve
TC 6
WG 6.1
Source :
Lecture Notes in Computer Science, 21th IFIP International Conference on Distributed Applications and Interoperable Systems (DAIS), 21th IFIP International Conference on Distributed Applications and Interoperable Systems (DAIS), Jun 2021, Valletta, Malta. pp.83-98, ⟨10.1007/978-3-030-78198-9_6⟩, Distributed Applications and Interoperable Systems ISBN: 9783030781972, DAIS
Publication Year :
2021
Publisher :
HAL CCSD, 2021.

Abstract

A k-anonymous broadcast can be implemented using a small group of dining cryptographers to first share the message, followed by a flooding phase started by group members. Members have little incentive to forward the message in a timely manner, as forwarding incurs costs, or they may even profit from keeping the message. In worst case, this leaves the true originator as the only sender, rendering the dining-cryptographers phase useless and compromising their privacy. We present a novel approach using a modified dining-cryptographers protocol to distributed shares of an (n,k)-Shamir's secret sharing scheme. Finally, all group members broadcast their received share through the network, allowing any recipient of k shares to reconstruct the message, enforcing anonymity. If less than k group members broadcast their shares, the message cannot be decoded thus preventing privacy breaches for the originator. Our system provides (n-|attackers|)-anonymity for up to k-1 attackers and has little performance impact on dissemination. We show these results in a security analysis and performance evaluation based on a proof-of-concept prototype. Throughput rates between 10 and 100 kB/s are enough for many real applications with high privacy requirements, e.g., financial blockchain system.<br />16 pages, 5 figures

Details

Language :
English
ISBN :
978-3-030-78197-2
ISBNs :
9783030781972
Database :
OpenAIRE
Journal :
Lecture Notes in Computer Science, 21th IFIP International Conference on Distributed Applications and Interoperable Systems (DAIS), 21th IFIP International Conference on Distributed Applications and Interoperable Systems (DAIS), Jun 2021, Valletta, Malta. pp.83-98, ⟨10.1007/978-3-030-78198-9_6⟩, Distributed Applications and Interoperable Systems ISBN: 9783030781972, DAIS
Accession number :
edsair.doi.dedup.....cd89f53c0baab443750985a954adfd22