Paper 2020/845

Post-Quantum Adaptor Signatures and Payment Channel Networks

Muhammed F. Esgin, Oguzhan Ersoy, and Zekeriya Erkin


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 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 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 LAS.

Available format(s)
Public-key cryptography
Publication info
Published elsewhere. ESORICS 2020
Post-QuantumBlockchainLatticeAdaptor SignatureScriptless ScriptPayment Channel Network
Contact author(s)
muhammed esgin @ monash edu
o ersoy @ tudelft nl
z erkin @ tudelft nl
2020-07-12: received
Short URL
Creative Commons Attribution


      author = {Muhammed F.  Esgin and Oguzhan Ersoy and Zekeriya Erkin},
      title = {Post-Quantum Adaptor Signatures and Payment Channel Networks},
      howpublished = {Cryptology ePrint Archive, Paper 2020/845},
      year = {2020},
      note = {\url{}},
      url = {}
Note: In order to protect the privacy of readers, does not use cookies or embedded third party content.