Research On Traceability Privacy Information Protection Model Of Agricultural Product Supply Chain Based On Blockchain

Establishing a traceability system of agricultural product supply chain is an effective means to ensure the quality and safety of agricultural products.The traditional agricultural product supply chain traceability system has problems of centralized management.The data in the traceability system is easy to be lost and tampered with,and cannot be effectively traced.The blockchain technology based on consensus algorithm and cryptographic algorithm has the characteristics of distributed storage,decentralization,tamper-proof,openness,transparency and traceability.Provide complete technical support for the realization of decentralized storage,tamper-proof and traceability of agricultural product supply chain traceability data.However,due to the open and transparent nature of the blockchain,once the data is uploaded,the direct upload of traceability data to the blockchain will result in the leakage of private data in the traceability system of the agricultural product supply chain,which makes the main body of the supply chain have concerns about sharing the real traceability data.To solve the above problems,this paper studies a blockchain-based privacy information protection model for agricultural product supply chain traceability.The main research work of this paper is as follows:(1)Put forward the division strategy of traceability data of agricultural product supply chain.Aiming at the problem that the subjects in the traceability system of agricultural products supply chain are unwilling to share private data,this paper proposes a strategy to divide the traceability data of agricultural products.Taking the tea supply chain as an example,this paper divides the links of the tea supply chain,extracts the key traceability data of each link,formulates the traceability data division strategy according to the willingness of each subject to share the traceability data and the relevant standards for the quality and safety of agricultural products,divides the traceability data into public data and private data,and lays a data foundation for the protection of the privacy data of this model.(2)A blockchain based traceability privacy information protection scheme of agricultural products is designed.Due to the open and transparent nature of blockchain,a large number of private data in the traceability system of agricultural products supply chain are leaked.This paper proposes to use AES and ECC hybrid encryption algorithm to encrypt the divided privacy data.The hybrid encryption algorithm extracts the advantages of the two algorithms,and has the characteristics of fast encryption speed and key security management to ensure the security of agricultural product traceability private data.(3)A rights management mechanism of agricultural product supply chain traceability system is designed.Due to the large number of users participating in the agricultural product supply chain traceability system,in the process of information sharing,if the identity management is improper,it will also cause privacy data leakage.Based on the blockchain environment,this paper designs a smart contract to add role access rights to the agricultural product supply chain traceability system.Control,only users with permissions can access the data in the supply chain traceability system,further reducing the risk of traceability data leakage.(4)The traceability information management system of agricultural product based on blockchain is designed and developed.Based on the design of the privacy information protection model,this paper builds a blockchain-based agricultural product traceability information management system,which mainly includes functions such as privacy data protection,authority management,and storage design.Through the test of system function,it shows that this model can realize the protection of private data and the safe sharing of data.This research can effectively solve the problem of privacy data leakage of traceability of agricultural products in the blockchain,and has a positive effect on the development of blockchain technology in the agricultural field.