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Partially Non-Interactive Two-Round Lattice-Based Threshold Signatures

Authors:
Rutchathon Chairattana-Apirom , University of Washington
Stefano Tessaro , University of Washington
Chenzhi Zhu , University of Washington
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Conference: ASIACRYPT 2024
Abstract: This paper gives the first lattice-based two-round threshold signature based on standard lattice assumptions for which the first message is independent of the message being signed without relying on fully-homomorphic encryption, and our construction supports arbitrary thresholds. Our construction provides a careful instantiation of a generic threshold signature construction by Tessaro and Zhu (EUROCRYPT '23) based on specific linear hash functions, which in turns can be seen as a generalization of the FROST scheme by Komlo and Goldberg (SAC '20). Our reduction techniques are new in the context of lattice-based cryptography. Also, our scheme does not use any heavy tools, such as NIZKs or homomorphic trapdoor commitments.
BibTeX
@inproceedings{asiacrypt-2024-34696,
  title={Partially Non-Interactive Two-Round Lattice-Based Threshold Signatures},
  publisher={Springer-Verlag},
  author={Rutchathon Chairattana-Apirom and Stefano Tessaro and Chenzhi Zhu},
  year=2024
}