Abstract: Addressing the issues of identity privacy leakage and malicious node threats in consortium blockchains, this paper proposes an identity privacy protection scheme that integrates hierarchical group signatures with secret sharing algorithms. This scheme, based on elliptic curve cryptography and distributed secret sharing technology, achieves multiparty participation in key pair generation and multilayered signature processes, aiming to enhance the confidentiality of member identities. Specifically, the scheme strengthens the security of the master group private key through distributed secret sharing technology, ensuring that its recovery depends on the collaboration of multiple subgroup members, effectively reducing the risk of privacy leakage caused by single points of failure or malicious node activities. Theoretical analysis and experimental validation demonstrate that the proposed scheme offers significant advantages in terms of anonymity and efficiency, effectively preventing signature forgery and privacy leakage.

Key words: consortium blockchain, hierarchical group signature, privacy protection, secret sharing, hash function

摘要： 针对联盟链中身份隐私泄露及恶意节点威胁问题，提出了一种基于层次化群签名与秘密共享算法的身份隐私保护方案.该方案基于椭圆曲线密码学和分布式秘密共享技术，实现了多方参与的密钥对生成和多层签名过程，旨在增强成员身份保密性.特别地，方案通过分布式秘密共享技术强化了主群体私钥的安全性，确保其恢复必须依赖于多个子群体成员的协作，有效减少了单点故障或恶意节点活动导致的隐私泄露风险.理论分析与实验验证均证明了所提方案在匿名性和效率方面具有显著优势，有效防止了签名伪造和隐私泄露.

关键词: 联盟链, 层次化群签名, 隐私保护, 秘密共享, 哈希函数