<div class="csl-bib-body">
<div class="csl-entry">Aumayr, L., Abbaszadeh, K., & Maffei, M. (2023, February 28). <i>Thora: Atomic and Privacy-Preserving Multi-Channel Updates</i> [Poster Presentation]. Network and Distributed System Security Symposium (NDSS) 2023, San Diego, United States of America (the). http://hdl.handle.net/20.500.12708/189792</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/189792
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dc.description.abstract
Most blockchain-based cryptocurrencies suffer from a heavily limited transaction throughput, which is a barrier to their growing adoption. Payment channel networks (PCNs) are one of the promising solutions to this problem. PCNs reduce the on-chain load of transactions and increase the throughput by processing many payments off-chain. In fact, any two users connected via a path of payment channels (i.e., joint addresses between the two channel end-points) can perform payments, and the underlying blockchain is used only when there is a dispute between users. Unfortunately, payments in PCNs can only be conducted securely along a path, which prevents the design of many interesting applications. Moreover, the most widely used implementation, the Lightning Network in Bitcoin, suffers from a collateral lock time linear in the path length, it is affected by security issues, and it relies on specific scripting features called Hash Timelock Contracts that hinders the applicability of the underlying protocol in other blockchains. In this work, we present Thora, the first Bitcoin-compatible off-chain protocol that enables the atomic update of arbitrary channels (i.e., not necessarily forming a path). This enables the design of a number of new off-chain applications, such as payments across different PCNs sharing the same blockchain, secure and trustless crowdfunding, and channel rebalancing. Our construction requires no specific scripting functionalities other than digital signatures and timelocks, thereby being applicable to a wider range of blockchains. We formally define security and privacy in the Universal Composability framework and show that our cryptographic protocol is a realization thereof. In our performance evaluation, we show that our construction requires only constant collateral, independently from the number of channels, and has only a moderate off-chain communication as well as computation overhead.
en
dc.description.sponsorship
CoBloX Pty Ltd.
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dc.description.sponsorship
Europäischer Forschungsrat (ERC)
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dc.description.sponsorship
FWF Fonds zur Förderung der wissenschaftlichen Forschung (FWF)
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dc.description.sponsorship
FFG - Österr. Forschungsförderungs- gesellschaft mbH
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dc.description.sponsorship
FFG - Österr. Forschungsförderungs- gesellschaft mbH
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dc.description.sponsorship
Wirtschaftsagentur Wien Ein Fonds der Stadt Wien
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dc.description.sponsorship
Christian Doppler Forschungsgesells
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dc.language.iso
en
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dc.subject
blockchain
en
dc.subject
security
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dc.subject
privacy
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dc.subject
payment channel networks
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dc.subject
Bitcoin
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dc.subject
Lightning Network
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dc.title
Thora: Atomic and Privacy-Preserving Multi-Channel Updates
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
University of Maryland, Baltimore, United States of America (the)
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dc.relation.grantno
Funding Agreement coblox
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dc.relation.grantno
771527
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dc.relation.grantno
P31621-N38
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dc.relation.grantno
864738
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dc.relation.grantno
843274
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dc.relation.grantno
ViSP
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dc.relation.grantno
CDL-BOT
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dc.type.category
Poster Presentation
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tuw.project.title
Security and Privacy for the COMIT Network
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tuw.project.title
Foundations and Tools for Client-Side Web Security
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tuw.project.title
Cryptographic Foundations for Future-proof Internet Security
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tuw.project.title
Privacy-Preserving Regulatory Technologies for Distributed Ledger Technologies
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tuw.project.title
SBA - COOP COMET SBA2
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tuw.project.title
Forschungszentrum für Cybersicherheit und Datenschutz in Wien
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tuw.project.title
Blockchaintechnologien für das Internet der Dinge
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tuw.researchTopic.id
I1
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tuw.researchTopic.name
Logic and Computation
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tuw.researchTopic.value
100
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tuw.publication.orgunit
E192-06 - Forschungsbereich Security and Privacy
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tuw.author.orcid
0000-0001-8006-3172
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tuw.event.name
Network and Distributed System Security Symposium (NDSS) 2023
en
tuw.event.startdate
27-02-2023
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tuw.event.enddate
03-03-2023
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
San Diego
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tuw.event.country
US
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tuw.event.presenter
Aumayr, Lukas
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tuw.event.track
Multi Track
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wb.sciencebranch
Informatik
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wb.sciencebranch.oefos
1020
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wb.sciencebranch.value
100
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item.openairetype
conference poster not in proceedings
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item.fulltext
no Fulltext
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item.cerifentitytype
Publications
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item.languageiso639-1
en
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item.openairecristype
http://purl.org/coar/resource_type/c_18co
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item.grantfulltext
none
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crisitem.author.dept
E192-06 - Forschungsbereich Security and Privacy
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crisitem.author.dept
University of Maryland, Baltimore
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crisitem.author.dept
E192-06 - Forschungsbereich Security and Privacy
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crisitem.author.orcid
0000-0001-8006-3172
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crisitem.author.parentorg
E192 - Institut für Logic and Computation
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crisitem.author.parentorg
E192 - Institut für Logic and Computation
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crisitem.project.funder
Europäischer Forschungsrat (ERC)
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crisitem.project.funder
FWF - Österr. Wissenschaftsfonds
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crisitem.project.funder
FFG - Österr. Forschungsförderungs- gesellschaft mbH
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crisitem.project.funder
FFG - Österr. Forschungsförderungs- gesellschaft mbH
