Threshold adapter signature method and apparatus, electronic device, and storage medium

CN122933128APending Publication Date: 2026-10-16HUBEI UNIV OF TECH +1
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Patent Information

Application Number
CN202611103651.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-23
Publication Date
2026-10-16

AI Technical Summary

Technical Problem

[0005]本申请的主要目的在于提供一种阈值适配器签名方法、装置、电子设备及存储介质，旨在解决如何提升阈值适配器签名方法的安全性和适应性的技术问题

Benefits of technology

（1）各签名方基于系统参数协同生成各自的私钥份额和完整公钥，系统参数包括椭圆曲线基点；适配方基于椭圆曲线基点计算困难问题实例和对应的见证；当签名方达到阈值数量时，签名方根据待签名消息、各自的私钥份额协同、完整公钥以及困难问题实例，协同生成预签名，其中，预签名与困难问题实例绑定；验证方根据预签名验证算法判断预签名的有效性，得到验证结果，得到验证结果，预签名验证算法包括承诺验证算法和SM2签名验证算法，验证结果包括判定有效的预签名；适配方获取判定有效的预签名，并根据见证将预签名适配为和待签名消息关联的全签名；任一获知预签名和全签名的参与方，根据预签名与全签名之间的数值关系，计算并提取出见证。通过将完整的SM2签名私钥安全拆分为多个份额由不同签名方持有，从根本上消除了单点保管私钥所带来的泄露和失效风险。通过引入适配器签名机制，将签名的有效性绑定于一个由适配方提出的、基于椭圆曲线离散对数问题的困难实例，使得签名过程具备了条件触发的特性。在签名阶段，达到阈值的签名方群体能够协同生成一个与困难实例绑定的、可公开验证的预签名，而无需恢复完整私钥或知晓适配方的秘密见证。随后，掌握见证的适配方可以独立地将预签名适配转化为标准的SM2全签名，可以将阈值签名的分布式安全优势与适配器签名的条件支付或原子交换能力相结合。最终，预签名与全签名之间存在的确定数学关系，使得任何观察到两者的参与方都能自动提取出秘密见证，从而实现了去中心化的秘密交换验证。本申请不仅解决了传统适配器签名方案中的私钥单点风险问题，还突破了标准阈值签名方案无法直接支持条件触发式高级密码协议的局限，提升了阈值适配器签名方法的安全性和适应性，在保持与SM2标准完全兼容的前提下，为构建协同签名应用提供了核心密码学支撑。

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Abstract

The application discloses a threshold adaptor signature method and device, electronic equipment and storage medium, and relates to the technical field of information security. The method comprises the following steps: each signature party generates a private key share and a complete public key based on system parameters; an adaptor party calculates a difficult problem instance and a corresponding witness based on an elliptic curve base point; when the number of signature parties reaches a threshold, the signature parties generate a pre-signature based on a message to be signed, the private key share, the complete public key and the difficult problem instance; a verification party determines the validity of the pre-signature according to a pre-signature verification algorithm, and obtains a valid pre-signature; the adaptor party obtains the valid pre-signature, and adapts the pre-signature into a full signature associated with the message to be signed according to the witness; any party that knows the pre-signature and the full signature calculates and extracts the witness according to the numerical relationship between the pre-signature and the full signature. The method improves the security and adaptability of the threshold adaptor signature method.
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