Research on Fine-grained Security Sharing Model of Medical Information Based on Blockchain

Abstract

In light of the vulnerabilities in traditional medical information systems, including the susceptibility to malicious tampering of patients’ medical records, opaque access decisions, and challenges in data sharing, this paper introduces a fine-grained security sharing model for medical information based on blockchain. Firstly, it leverages blockchain technology in conjunction with attribute-based access control to automate multi-authority fine-grained access control through smart contracts. Secondly, it categorizes sensitive attributes of different users and electronic medical records into distinct levels, implementing personalized privacy protection within the transaction workflow using local differential privacy policies and varying privacy budgets. Finally, a prototype system, built upon a consortium blockchain, was developed and tested using a dataset of 100,000 real-world electronic medical records. Experimental results demonstrate the model’s capability to facilitate stable and reliable transactions between electronic medical record publishers and requestors while ensuring privacy protection.

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