Block chain assisted medical big data search mechanism and privacy protection method

Abstract

The invention relates to a block chain assisted medical big data search mechanism and privacy protection method, and belongs to the technical field of information. The method comprises the following steps: S1, uploading encrypted electronic medical data to a block chain; s2, the medical block chain system processes the encrypted electronic medical data in the block chain into a database, and supports ciphertext query in the database; s3, performing access control on the user added into the medical block chain system, and judging a user identity and an electronic medical data access permission; s4, the user sends a search request to the medical block chain system, and the medical block chain system executes ciphertext search; and S5, the medical block chain system decrypts the search result, encrypts the electronic medical data again by using a unified encryption algorithm, and returns an encryption result and the random key to the user. According to the method, the search time of the medical block chain data is shortened, and meanwhile, the correctness and reliability of the data are considered under the condition that the privacy of a patient is not leaked.

Description

technical field [0001] The invention belongs to the field of informatization, and relates to a blockchain-assisted medical big data search mechanism and a privacy protection method. Background technique [0002] With the development of the medical field, medical health has penetrated into every household and has become a basic physiological need of human beings. With the advent of the era of big data, medical institutions and individuals generate a large amount of structured and unstructured electronic medical data every day. The data volume and data scale of these electronic medical data are also increasing rapidly, which leads to the traditional database And software technology has become extremely difficult to process this data. [0003] In the era of medical big data, the integrity and accuracy of medical data are valuable assets for patients, and the sharing of medical data is conducive to controlling the spread of diseases. However, medical data originally stored by ...

AI Technical Summary

Problems solved by technology

As the amount of data and blocks increase, the chain continues to grow, and the search will be quite time-consuming

Taking Ethereum as an example, medical institutions encrypt patients’ medical data and upload them to the blockchain through smart contracts. These encrypted medical data will be stored as additional data in hexadecimal format in the corresponding transaction’s “input "In the field, you need to traverse the block first when searching, and finally decrypt the data after traversing the transaction and decoding the input to judge whether the data to be searched meets the requirements. This is undoubtedly quite time-consuming

Finally, the existing research rarely supports the search of different conditions for the additional data stored, and in the ciphertext state, ordinary encryption cannot support the search of different conditions

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