Ciphertext sharing method, medium, sharing client and system

Abstract

The invention provides a ciphertext sharing method, a medium, a sharing client and a system. The ciphertext sharing method comprises the following steps: determining a to-be-shared plaintext file set,a plaintext file ID set and a keyword set; creating a query key and a symmetric encryption key corresponding to each plaintext file in the plaintext file set; encrypting each plaintext file accordingto the symmetric encryption key to generate a ciphertext, and sending the ciphertext to a server; deploying an intelligent contract in a blockchain in combination with the plaintext file ID set and the keyword set; and sending the query key and the symmetric encryption key to the successfully authorized access client, so that the access client obtains a ciphertext through the intelligent contractin combination with the query key, and decrypts the ciphertext through the symmetric encryption key to obtain a plaintext. According to the ciphertext sharing method provided by the invention, bidirectional data safety sharing between the data owner and the visitor is realized.

Description

technical field [0001] The invention belongs to the technical field of network technology and security, and relates to a method for sharing ciphertext, in particular to a method for sharing ciphertext, a medium, a sharing client and a system. Background technique [0002] At present, the managed storage of private data makes the confidentiality protection and on-demand (keyword) retrieval of data a concern of users. The ciphertext sharing mechanism based on searchable encryption gives users the ability to query ciphertext while ensuring the privacy and security of data. . However, the current ciphertext security sharing strategy cannot simultaneously realize functions such as multi-keyword sortable retrieval in a decentralized environment, fuzzy keyword retrieval, and verifiable retrieval results. In practical applications, such as case data in electronic medical record systems In application scenarios such as sharing and private data query based on cloud storage, flexible ...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a ciphertext sharing method, medium, sharing client and system, which are used to solve the problem that the prior art cannot pass accurate and reliable ciphertext in a non-center environment. The problem of two-way data security sharing between data owners and visitors in text retrieval

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