Encryption and search method for revocable keyword search public keys in cloud storage

Abstract

The invention discloses an encryption and search method for revocable keyword search public keys in cloud storage and belongs to the technical field of network security. The method includes: setting system public parameters and dividing system time into z time segments, and creating a public-private key pair at a client; when data storage requests occurs, selecting a keyword collection of a data file, selecting optional symmetrical encryption algorithm to encrypt the data file, utilizing the public key and the current time segment to encrypt the keyword collection, and transmitting the encrypted keyword collection to the cloud server; when the next time segment arrives, generating keyword collection cipher again, and updating the cloud server on a server; when a keyword search request occurs, by the client, utilizing the private key and the current time segment to calculate trap door information of the keywords, transmitting the trap door information to the cloud server, and by the cloud server, obtaining the search results and sending back file cipher containing the search keywords to users. The encryption and search method is suitable for cloud storage with high safety requirements, safe, and efficient, and has the capability of revoking server search.

Description

technical field [0001] The invention belongs to the technical field of network security, and in particular relates to a revocable keyword search public key encryption method and a search method in secure cloud storage. Background technique [0002] Cloud storage is a new concept extended and developed from the concept of cloud computing. Cloud computing is the development of distributed processing, parallel processing and grid computing. The huge computing processing program is automatically split into countless smaller subroutines through the network, and then submitted to the huge system composed of multiple servers for calculation and analysis. Afterwards, the processing result is passed back to the user. Through cloud computing technology, network service providers can process tens of millions or even billions of information in a few seconds, and achieve network services as powerful as "supercomputers". [0003] Cloud storage refers to a system that integrates a large ...

AI Technical Summary

Problems solved by technology

[0010] (3) The search speed is slow, and the search request response time is long;

[0011] (4) The search efficiency is low, and there are many bilinear pairing operations

[0012] Among them, the first two problems pose a great threat to the safe storage of user cloud data, while the latter two problems greatly consume the computing resources of the cloud server, making it impossible to respond to a large number of user search requests at the same time, causing users to wait too long, so are all to be avoided

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