Blockchain-based Proxy Re-Encryption Access Control Method for Biological Risk Privacy Protection of Agricultural Products

Shaohua Wang,Na Luo,Bin Xing, Zhenzhen Sun,Hang Zhang,Chuanheng Sun

SCIENTIFIC REPORTS（2024）

Natl Engn Lab Agriprod Qual Traceabil | Tianjin Agr Univ

Cited 0|Views24

Abstract

In today’s globalized agricultural system, information leakage of agricultural biological risk factors can lead to business risks and public panic, jeopardizing corporate reputation. To solve the above problems, this study constructs a blockchain network for agricultural product biological risk traceability based on agricultural product biological risk factor data to achieve traceability of biological risk traceability data of agricultural product supply chain to meet the sustainability challenges. To guarantee the secure and flexible sharing of agricultural product biological risk privacy information and limit the scope of privacy information dissemination, the blockchain-based proxy re-encryption access control method (BBPR-AC) is designed. Aiming at the problems of proxy re-encryption technology, such as the third-party agent being prone to evil, the authorization judgment being cumbersome, and the authorization process not automated, we design the proxy re-encryption access control mechanism based on the traceability of agricultural products’ biological risk factors. Designing an attribute-based access control (ABAC) mechanism based on the traceability blockchain for agricultural products involves defining the attributes of each link in the agricultural supply chain, formulating policies, and evaluating and executing these policies, deployed in the blockchain system in the form of smart contracts. This approach achieves decentralization of authorization and automation of authority judgment. By analyzing the data characteristics within the agricultural product supply chain to avoid the malicious behavior of third-party agents, the decentralized blockchain system acts as a trusted third-party agent, and the proxy re-encryption is combined with symmetric encryption to improve the encryption efficiency. This ensures a efficient encryption process, making the system safe, transparent, and efficient. Finally, a prototype blockchain system for traceability of agricultural biological risk factors is built based on Hyperledger Fabric to verify this research method’s reliability, security, and efficiency. The experimental results show that this research scheme’s initial encryption, re-encryption, and decryption sessions exhibit lower computational overheads than traditional encryption methods. When the number of policies and the number of requests in the access control session is 100, the policy query latency is less than 400 ms, the request-response latency is slightly more than 360ms, and the data uploading throughput is 48.7 tx/s. The data query throughput is 81.8 tx/s, the system performance consumption is low and can meet the biological risk privacy protection needs of the agricultural supply chain. The BBPR-AC method proposed in this study provides ideas for achieving refined traceability management in the agricultural supply chain and promoting digital transformation in the agricultural industry.

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Key words

Agricultural products biological risk factors,Privacy protection,Blockchain,Re-encryption,Attribute based access control

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【要点】：该论文提出了一种基于区块链的代理重加密访问控制方法（BBPR-AC），用于保护农业产品生物风险隐私信息，通过定义农业供应链各环节的属性、制定策略并利用智能合约在区块链系统中执行，实现了授权的去中心化和自动化判断。

【方法】：该方法构建了一个基于农业产品生物风险因子数据的区块链网络，实现了农业产品供应链生物风险追溯数据的追溯，通过分析农业产品供应链内的数据特征，结合去中心化区块链系统和代理重加密技术，提高了加密效率和系统的安全性。

【实验】：实验使用Hyperledger Fabric构建了一个原型区块链系统，验证了该研究方法的可行性。在100条策略和请求的访问控制会话中，策略查询延迟小于400毫秒，请求-响应延迟略超过360毫秒，数据上传吞吐量达到48.7 tx/s，数据查询吞吐量达到81.8 tx/s，系统性能消耗低，能满足农业供应链的生物风险隐私保护需求。

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