Abstract
Medical files can help people prevent diseases, increase cure rates, promote medical development and help solve major public health crises. However, medical files are strongly private. It is an urgent problem needed to be solved that how to share medical files with privacy and data security. The existing models based on the centralized certificate authority is a feasible method, but it is possible to experience a single point failure. Besides there is a mismatch between the models and real-life scenario since they are only suitable for single patient. Therefore, this paper proposes a practical medical file sharing scheme based on blockchain and decentralized attribute-based encryption. The blockchain is used to record application and grant of authorizations. Smart contracts provide an interactive platform for all users in the system. By utilizing decentralized attribute-based encryption, fine-grained access control of medical files is carried out to ensure privacy and security as well as avoiding single point failure. Attribute-based algorithm that support multi-person democratic decision making and dynamic personnel changes are designed to make the model much closer to the real scene. Finally, through security, performance and comparing analysis with other solutions, the scheme in this paper can meet the needs of real-life scenarios in terms of security and practicability, and provides a new practical model for medical file sharing.
Highlights
In the traditional medical field, paper medical records and imaging materials have already begun to transform into computer-stored electronic data
Problem Data Storage Center (DSC) may be interest in data Data access record is unknown Sharing history may be tampered Abuse of authority, difficult to trace Have no control over medical files Cannot contribute to medical development Medical files are not shared among hospitals Sharing Plaintext may infringe privacy
We use symmetric encryption to encrypt the medical files and store them in the DSC to ensure that DSC cannot access to the original file
Summary
In the traditional medical field, paper medical records and imaging materials have already begun to transform into computer-stored electronic data. Jiyu Tao et al.: Practical Medical Files Sharing Scheme Based on Blockchain and Decentralized Attribute-based Encryption distribution. Many scholars have combined the two to propose a new medical file sharing scheme based on blockchain and ABE. A medical file sharing scheme that is closer to reality, supports multi-person negotiation and decentralized access control is needed. Based on the two shortcomings of the above existing solutions, this paper proposes a practical medical file sharing solution based on blockchain and decentralized attribute encryption. We improve the decentralized attribute-based encryption and a multi-person collaboration mechanism is added to support democratic discussions and members to form an association. We propose a key update algorithm so that our scheme can achieves a flexible, efficient, scalable and more realistic medical file sharing solution. AAttrpub, AAttrpri the attribute public and private key of different association attributes
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