Post-Quantum Two-Party Adaptor Signature Based on Coding Theory

An adaptor signature can be viewed as a concealed with secret value and, by design, any two of the trio yield other. In multiparty setting, an initial allows each party to create additional signatures without original secret. Adaptor help address scalability and interoperability issues in blockchain. They also bring some important advantages cryptocurrencies, such low on-chain cost, improved transaction fungibility, fewer limitations blockchain’s scripting language. this paper, we propose new two-party scheme that relies on quantum-safe hard problems coding theory. The proposed uses hash-and-sign code-based introduced Debris-Alazard et al. relation defined from well-known syndrome decoding problem. To achieve all basic properties formalized Aumayr al., introduce further modifications aforementioned scheme. We give security analysis our its application atomic swap. After providing set parameters for scheme, show it has smallest pre-signature size compared existing post-quantum signatures.