The Controlled Sharing Mechanism for Private Data Based on Blockchain
Li Wenqing, Dong Wenjie, Xu Zhang, Yueming Lu · 2021
In order to solve the problems that private information is easy to be leaked and privacy violations are difficult to be traced in the process of data cross-domain transferring, we propose a blockchain-based controlled sharing mechanism for private data, which has the merits such as decentralization, tamper-proof, and traceability. By combining smart contract technology and cryptographic algorithms, we realize the user authentication and private data rights determination. On the basis of that, we extract privacy protection metadata by using technologies such as hash function and digital signature and then store it on the blockchain, which realizes the depositing and tracing of data transferring records. At the same time, we encrypt the original data and store it in a distributed file system to alleviate the problem of limited storage space in blockchain while ensuring the security of data storage.