Paper 2024/241

Generalized Adaptor Signature Scheme: From Two-Party to N-Party Settings

Kaisei Kajita, Japan Broadcasting Corporation (Japan)
Go Ohtake, Japan Broadcasting Corporation (Japan)
Tsuyoshi Takagi, University of Tokyo

Adaptor signatures have attracted attention as a tool to ad-dress scalability and interoperability issues in blockchain applications, for example, such as atomic swaps for exchanging di˙erent cryptocur-rencies. Adaptor signatures can be constructed by extending of common digital signature schemes that both authenticate a message and disclose a secret witness to a speci˝c party. In Asiacrypt 2021, Aumayr et al. formulated the two-party adaptor signature as an independent crypto-graphic primitive. In this study, we extend the their adaptor signature scheme formulation to N party adaptor signature scheme, present its generic construction, and de˝ne the security to be satis˝ed. Next, we present a concrete construction based on Schnorr signatures and discuss the security properties.

Available format(s)
Public-key cryptography
Publication info
Digital SignaturesAdaptor Signatures
Contact author(s)
kajita k-bu @ nhk or jp
ohtake g-fw @ nhk or jp
takagi @ mist i u-tokyo ac jp
2024-02-16: approved
2024-02-15: received
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      author = {Kaisei Kajita and Go Ohtake and Tsuyoshi Takagi},
      title = {Generalized Adaptor Signature Scheme: From Two-Party to N-Party Settings},
      howpublished = {Cryptology ePrint Archive, Paper 2024/241},
      year = {2024},
      note = {\url{}},
      url = {}
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