Blockchain-based Access Control Model to Preserve Privacy for Students’ Credit Information

In the process of sharing students’ credit information across schools and departments, there are some problems such as tampering and leaking of students’ credit information.In this paper, combined with the characteristics of blockchain traceability and difficult to tamper, a credit information access control method based on blockchain is proposed, which not only protects students’ privacy, but also realizes the cross school access control of students’ credit information.This paper designs a multi blockchain architecture that combines consortium blockchain and private blockchain of colleges and universities. It stores credit information summary on the blockchain and original records off the blockchain to relieve the storage pressure of blockchain; Then, the multi authorization attribute encryption technology is used to set the access policy for fine-grained access control.Finally, the simulation results show that the scheme can achieve fine-grained access control of students’ credit information while protecting students’ privacy.