A Proxy Re-Encryption Based Trusted Data Sharing Scheme for Digital Twins with Privacy Protection

Against the backdrop of accelerating digitalization, digital twin technology, through virtual-real mapping and real-time interaction mechanisms, has become a crucial supporting technology in fields such as industrial manufacturing and smart cities. However, the massive high-value data it generates faces risks such as sensitive information leakage and single points of failure during the sharing and circulation process. Traditional centralized protection solutions are insufficient to meet the security requirements in its distributed scenarios. To address these problems, this paper adopts a collaborative on-chain and off-chain storage architecture with blockchain and the InterPlanetary File System (IPFS), and proposes a multi-layered privacy protection scheme for data sharing and circulation, achieving distributed data storage and integrity verification. Additionally, a distributed proxy re-encryption algorithm for data sharing and circulation protection is designed, breaking through the centralized proxy bottleneck of traditional solutions, while effectively defending against collusion attacks and single points of failure. Experiments and system evaluations indicate that the proposed scheme has complete functionality and reliable service, and offers good security and performance.