Cloud storage ciphertext retrieval method and system

Abstract

The invention discloses a cloud storage ciphertext retrieval method and system. The method includes the following steps: (1) a step of generating a public key and a private key at a retrieval end; (2) an encryption step; (3) a step of generating a retrieval trap door; (4) a retrieval implementation step; (5) a decryption step. Through implementation of the cloud storage ciphertext retrieval method and system, the cloud storage ciphertext retrieval supports a retrieval strategy of nest of logic words such as AND, OR and NOT and the like and users are helped to accurately obtain needed data and thus the transmission cost is reduced and the method and system have the advantages of being simple in process and high in calculation efficiency. At the same time, the cloud storage ciphertext retrieval method and system adopt composite number order group and bilinear pairing for construction and thus known plaintext distribution regularity attacks and attacks targeted at access modes are effectively prevented and thus the security is comparatively high.

Description

technical field [0001] The invention relates to the technical field of cloud storage, in particular to a cloud storage ciphertext retrieval method and system thereof. Background technique [0002] At present, users' concerns about data security have become a crucial factor hindering the development of cloud storage. Because the user loses direct physical control over the data after outsourcing the data to the cloud storage service provider, the data will face double security threats from external network attacks and internal cloud storage administrators. [0003] The use of encryption technology is an effective way to solve the above security problems, that is, the user encrypts the data locally and then uploads it to the cloud storage server, and when accessing the data, downloads the data locally and then decrypts it. However, the disorder of ciphertext data has brought great troubles for users to retrieve these data. Because the cloud storage server cannot obtain the ke...

AI Technical Summary

Problems solved by technology

[0007] In the existing technology, after the cloud storage service provider encrypts the user data, it cannot quickly realize the query operation, but after downloading all the user data to the local and then decrypting and unlocking, it often needs to consume large bandwidth resources and At the same time, most of the existing ciphertext retrieval methods in the cloud environment are symmetric ciphertext retrieval, do not support the multi-user model, and the existing retrieval technology has the defects of low efficiency and limited expressive ability. The present invention proposes Method and system for retrieving stored ciphertext

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