LEChain:Linear Credit Evaluation System Based on Hyperledger Fabric Blockchain

Data sharing among different institutions can enhance the integrity of information to evaluate the credit level of financing enterprises more accurately, but it also faces the problems of privacy leakage and data fraud. To solve these problems, this paper proposes a complete linear credit evaluation system with secure sharing and multiparty collaborative computing based on Hyperledger Fabric Blockchain named LEChain. The system consists of four modules: distributed ledger, access control, security aggregation and model storage. With the help of 1-out-of-N oblivious transmission protocol, incorporating elementary matrix transformation data security aggregation realizes the privacy of data transmission and collaborative computation. Finally, a security analysis is given to show the privacy and compliance of the data aggregation.