Electronic medical record fine-grained access control and ciphertext searchable method based on block chain

Abstract

The invention discloses an electronic medical record fine-grained access control and ciphertext searchable method based on a block chain. The method comprises the following steps: dividing medical data into a public part and a private part, and giving different access structures to hospitals; sending a symmetric key; respectively encrypting the public part and the private part of the medical dataand uploading the public part and the private part to a cloud server; generating an index by utilizing the keyword; encrypting a symmetric key in the symmetric searchable encryption technology by using an attribute-based encryption technology, and uploading the encrypted symmetric key to a data pool; sending a request containing attribute information and interested keywords to the patient by a user; returning an attribute private key and a search voucher by a patient; sending the search voucher to the intelligent contract by the user, wherein the intelligent contract returns an index and a table; sending the index and the search voucher to the cloud server by the user, wherein the cloud server returns the medical data ciphertext, the ciphertext ID and the decryption table; and decrypting the symmetric key and the medical data by the user. The method is simple, effective and easy to operate, and the local load pressure is reduced while the data security is ensured.

Description

technical field [0001] The invention belongs to the field of information security, and specifically relates to a blockchain-based method for fine-grained access control and ciphertext search of electronic medical records. Background technique [0002] In recent years, the rapid development of information technology has made people feel unprecedented convenience, and all walks of life have widely used it for reform. In terms of medical care, with the increase of medical record data, traditional paper medical records can no longer meet people's needs. An emerging service model, electronic medical records have gradually entered people's field of vision. It has comprehensive information records and low interaction costs. Advantages, it can provide support in the fields of telemedicine, disease diagnosis, new drug research and development, etc., which greatly improves people's medical treatment problems. In addition, cloud computing, as an indispensable technology in the era of ...

AI Technical Summary

Problems solved by technology

Although the timeliness of data processing is guaranteed, there are still problems. Semi-trusted edge nodes may leak user's private data when processing data, and at the same time, the integrity and authenticity of data generated by network edge devices cannot be guaranteed.

Although the identity-based signature method can guarantee data integrity and authenticity, it cannot achieve anonymous authentication

Wang et al proposed a new blockchain-based personal health records sharing scheme with data integrity verifiable [WangS, Zhang D, Zhang Y. Blockchain-based personal health records sharing scheme with data integrity verifiable[J].IEEEAccess ,2019,PP(99):1-1.], in order to solve the problems of privacy leakage, limited keyword search ability, loss of control and other problems in the sharing process of personal health files, searchable symmetric encryption and attribute-based encryption technologies are adopted. Realize privacy protection, keyword search and fine-grained access control, but in this scheme, patients can only control the overall access to electronic medical records, and cannot share the public part and private part of electronic medical records separately

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