Authors

Abstract

Traceability is a crucial component in ensuring the secure sharing of information throughout the entire supply chain of agricultural products. However, existing blockchain-based traceability solutions lack identity anonymity, face challenges in regulatory traceability, and lack dynamic member management capabilities. This paper proposes a blockchain privacy protection scheme integrating group signatures, pseudonymity mechanisms, and revocable accumulators to address these issues. The core design of this scheme encompasses three key aspects: first, this study introduces a dynamic group signature algorithm to balance the anonymity of data signatures with the traceability of responsibility, ensuring both privacy protection and accountability for data sources. Second, this study designs a pseudonym-based identity-hiding and authentication-obfuscation mechanism to enhance privacy protection further, improve resistance to on-chain analysis, and prevent the leakage of user identities. Finally, an efficient dynamic member management protocol is constructed to support rapid node joining and flexible revocation, thereby addressing frequent member changes in agricultural supply chains. Security analysis indicates that the scheme meets stringent security requirements regarding anonymity, non-repudiation, and traceability. Experimental results show that the proposed scheme outperforms existing solutions regarding signature verification overhead, communication costs, and operational efficiency, demonstrating good practicality and scalability, and providing practical support for privacy protection and digital regulation in agricultural supply chains.

Abstract in Chinese

溯源是保障农产品全流程信息安全共享的重要部分。然而，现有基于区块链的溯源方案不具备身份匿名性、监管可追溯性困难以及缺少动态成员管理方面。为了解决这些问题，本文提出了一种融合群签名、伪名机制与可撤销累加器的区块链隐私保护方案。该方案的核心设计包括以下三个方面：首先，引入了动态群签名算法，以实现数据签名的匿名性与责任可追溯性的平衡，确保数据源的隐私保护与责任追溯；其次，设计了基于伪名的身份隐藏与认证混淆机制，进一步加强了隐私保护，提升了抗链上分析的能力，防止用户身份泄露；最后，构建了高效的动态成员管理协议，支持节点的快速加入与灵活撤销，从而应对农业供应链中频繁的成员变动。安全性分析表明，该方案在匿名性、不可伪造性和可追溯性等方面满足严格的安全要求。实验结果显示，本文方案在签名验证开销、通信成本以及运行效率上优于现有方案，具备较好的实用性与可扩展性，为农业供应链中的隐私保护与数字监管提供了有效的支持。