Grid-based multi-user fuzzy searchable encryption method in secure multimedia cloud storage

Abstract

The invention relates to a grid-based multi-user fuzzy searchable encryption method in secure multimedia cloud storage. The semantic information is used to realize the privacy semantic search of encrypted data. The user-selected search keywords do not need to be exactly the same as the keywords in the outsourced encrypted multimedia data. in view of the shortcomings of the existing scheme that only supports single-user application, the scheme introduces the searchable broadcast encryption method; encrypted multimedia files can be shared by a group of users without sharing their own private keys; each authorized user can use his / her unique private key to generate his / her own keyword trap door; and the user can also upload the encrypted multimedia files as a data sender using the group public key. The scheme introduces the concept of post-quantum security and designs a searchable broadcast encryption scheme that supports semantic keyword search, and the scheme is constructed by means of grid-based cryptography and grid-based proxy methods. Based on the difficulty of LWE (error learning) problem, the security of resisting quantum attack can be realized.

Description

technical field [0001] The invention relates to a grid-based multi-user fuzzy searchable encryption method in secure multimedia cloud storage. Background technique [0002] Cloud computing can use shared resources to provide high-quality services, which has attracted more and more attention from individuals, enterprises and governments. Local information can be outsourced and stored in the cloud, thereby avoiding the huge cost of purchasing and maintaining private storage devices and effectively reducing management costs. This new computing model enables enterprises to focus on core business rather than infrastructure. Through the Internet, consumers can obtain computing and storage services from the cloud anytime, anywhere. [0003] Because the multimedia data stored in the multimedia cloud (MC) is stored in clear text, the internal staff of the MC service provider may sell the user's sensitive data (such as: financial negotiation video, electronic health image, business ...

AI Technical Summary

Problems solved by technology

In 2011, Zhang et al. proposed a public key SE scheme that supports concatenated keyword search, but did not give a complete security proof

In 2012, Zhang et al. proposed a lattice-based searchable encryption scheme, but it did not generate public and private keys for system users, which is a fatal shortcoming

[0007] In view of the current searchable encryption schemes for multimedia cloud storage, the query efficiency is low, it is only applicable to a single user, and it cannot resist quantum attacks. Secure Data Retrieval Scheme

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