关键词: 联盟链, 层次化群签名, 隐私保护, 秘密共享, 哈希函数

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