Blockchain-based privacy-preserving data-sharing framework using proxy re-encryption scheme and interplanetary file system

Through the use of Ethereum, a framework is designed to simplify data exchange mechanism, improve food traceability, and improve privacy. A supply chain management system for agriculture is proposed and implemented in this paper to meet the confidentiality requirements of sensitive data and data ownership requirements. In a public blockchain environment, users can transparently verify every block generated at runtime and easily access data hosted on shared storage without authorization. To improve key distribution efficiency, we developed a proxy re-encryption scheme to manage the symmetric keys of encrypted data on shared storage. Blockchain services should improve the availability of persistent data. The interplanetary File System is used as a storage backend and to provide a file-based database that combined IPFS and a blockchain. Access control is a necessary function in the framework of multi-user data exchange. Users can manage permissions based on any data set in the Access Control List model using smart contracts that are defined by data owners. Finally, we demonstrate the system by developing a management application and integrating it into an existing food traceability system with a decoupled architecture. This demonstrates the system's ability to adapt to open data services while establishing a reliable hybrid architecture.