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This paper gives the first lattice-based two-round threshold signature scheme that tolerates the adaptive corruption of up to \(T -1\) out of N signers. Our construction is based on the MLWE and MSIS assumptions. We substantially improve upon the only existing adaptively secure lattice-based construction, recently given by Katsumata, Reichle, and Takemure (CRYPTO ’24), which requires five rounds.

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Tweed: Adaptively Secure Lattice-Based Two-Round Threshold Signatures

  • 会议论文

  • 发表日期：

    2026年

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  • Kaijie Jiang,
  • Stefano Tessaro,
  • Hoeteck Wee,
  • Chenzhi Zhu

摘要

This paper gives the first lattice-based two-round threshold signature scheme that tolerates the adaptive corruption of up to \(T -1\) out of N signers. Our construction is based on the MLWE and MSIS assumptions. We substantially improve upon the only existing adaptively secure lattice-based construction, recently given by Katsumata, Reichle, and Takemure (CRYPTO ’24), which requires five rounds.