Scholarlink

We present One-Round “Cheating” Adaptor Signatures (ORCAS): a novel and efficient construction of adaptor signature schemes from CSI-FiSh. Our protocol improves substantially on existing group action-based schemes: Unlike IAS (Tairi et al., FC 2021), our scheme does not require expensive non-interactive zero-knowledge proofs, and unlike adaptor MCSI-FiSh (Jana et al., CANS 2024) our construction does not require any modification to the underlying digital signature scheme. We prove the protocol’s security under the strong security notions of Dai et al. (Indocrypt 2022) and Gerhart et al. (Eurocrypt 2024).

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Post-quantum Adaptor Signatures with Strong Security from Cryptographic Group Actions

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Ryann Cartor,
  • Nathan Daly,
  • Giulia Gaggero,
  • Jason T. LeGrow,
  • Andrea Sanguineti,
  • Silvia Sconza

摘要

We present One-Round “Cheating” Adaptor Signatures (ORCAS): a novel and efficient construction of adaptor signature schemes from CSI-FiSh. Our protocol improves substantially on existing group action-based schemes: Unlike IAS (Tairi et al., FC 2021), our scheme does not require expensive non-interactive zero-knowledge proofs, and unlike adaptor MCSI-FiSh (Jana et al., CANS 2024) our construction does not require any modification to the underlying digital signature scheme. We prove the protocol’s security under the strong security notions of Dai et al. (Indocrypt 2022) and Gerhart et al. (Eurocrypt 2024).