Post-quantum adaptor signatures and payment channel networks

Muhammed F. Esgin, Oğuzhan Ersoy, Zekeriya Erkin

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Adaptor signatures, also known as scriptless scripts, have recently become an important tool in addressing the scalability and interoperability issues of blockchain applications such as cryptocurrencies. An adaptor signature extends a digital signature in a way that a complete signature reveals a secret based on a cryptographic condition. It brings about various advantages such as (i) low on-chain cost, (ii) improved fungibility of transactions, and (iii) advanced functionality beyond the limitation of the blockchain’s scripting language. In this work, we introduce the first post-quantum adaptor signature, named $${\mathsf {LAS}}$$. Our construction relies on the standard lattice assumptions, namely Module-SIS and Module-LWE. There are certain challenges specific to the lattice setting, arising mainly from the so-called knowledge gap in lattice-based proof systems, that makes the realization of an adaptor signature and its applications difficult. We show how to overcome these technical difficulties without introducing additional on-chain costs. Our evaluation demonstrates that $${\mathsf {LAS}}$$ is essentially as efficient as an ordinary lattice-based signature in terms of both communication and computation. We further show how to achieve post-quantum atomic swaps and payment channel networks using $${\mathsf {LAS}}$$.

Original languageEnglish
Title of host publicationComputer Security – ESORICS 2020 - 25th European Symposium on Research in Computer Security, ESORICS 2020, Proceedings
Subtitle of host publication25th European Symposium on Research in Computer Security, ESORICS 2020, Proceedings
EditorsLiqun Chen, Steve Schneider, Ninghui Li, Kaitai Liang
Place of PublicationCham
PublisherSpringer
Pages378-397
Number of pages20
EditionPart II
ISBN (Electronic)978-3-030-59013-0
ISBN (Print)978-3-030-59012-3
DOIs
Publication statusPublished - 2020
Event25th European Symposium on Research in Computer Security, ESORICS 2020 - Guildford, United Kingdom
Duration: 14 Sep 202018 Sep 2020

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume12309 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference25th European Symposium on Research in Computer Security, ESORICS 2020
CountryUnited Kingdom
CityGuildford
Period14/09/2018/09/20

Bibliographical note

Accepted author manuscript

Keywords

  • Adaptor signature
  • Blockchain
  • Lattice
  • Payment channel network
  • Post-quantum
  • Scriptless script

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