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Ciphertext search method, system and device in cloud computing environment

A technology of cloud computing environment and search method, which is applied in the field of equipment and storage media, ciphertext search method and system, and can solve the problems of high precision error and low search efficiency

Pending Publication Date: 2021-02-05
SHENZHEN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the VSM semantic space, such as document topic classification, keywords, synonyms, etc., which will cause low search efficiency and high accuracy errors.

Method used

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  • Ciphertext search method, system and device in cloud computing environment
  • Ciphertext search method, system and device in cloud computing environment
  • Ciphertext search method, system and device in cloud computing environment

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Embodiment Construction

[0034] In order to make the purpose, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the application. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0035] figure 1 It is a schematic flow chart of the ciphertext search method in the cloud computing environment in the embodiment of the present application. In this embodiment, the above-mentioned ciphertext search method in the cloud computing environment includes:

[0036] Step 101, the client-based encryption party encrypts the plaintext set to obtai...

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Abstract

The invention provides a ciphertext search method and system in a cloud computing environment, equipment and a storage medium. The method comprises the steps of encrypting a plaintext set based on a client to obtain a ciphertext, obtaining a ciphertext index table according to the ciphertext, randomly generating a user permission table, and uploading a ciphertext structure, the user permission table and the ciphertext index table to a cloud server; receiving a ciphertext private key application request based on the client, generating a search trap door and sending the search trap door to the cloud server; matching the user attributes with the weight strategy tree, and if matching succeeds, obtaining an index ciphertext by searching keywords and screening a ciphertext index table; and returning, by the cloud server, an intermediate value of the index ciphertext to the client, and decrypting the intermediate value to obtain a search result. According to the method, an efficient retrievalfunction of ciphertext data is realized; the control data of the cloud server is completely fuzzified by utilizing the characteristic of fully homomorphic encryption, so that the confidentiality andthe efficiency of cloud data processing are greatly improved; in addition, the access strategy is in many-to-many relationship with the user, so that the keyword guessing attack can be resisted.

Description

technical field [0001] The invention belongs to the technical field of data processing, and in particular relates to a ciphertext search method, system, device and storage medium in a cloud computing environment. Background technique [0002] As a distributed computing technology, cloud computing has almost unlimited computing power and storage space. However, since cloud data is beyond the user's control, these data must ensure data privacy and effective access control during use. In order to solve the data privacy problem and realize effective operation, fully homomorphic encryption can be performed on the data, and the fully homomorphic encryption satisfies F(Enc(u))=Enc(F(u)). This feature meets the needs of cloud computing models such as cloud computing security and ciphertext retrieval, so the study of homomorphic encryption has important theoretical significance and application value. In addition, the implementation of cloud data access control policies requires the...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0861H04L9/0869H04L9/088Y02D30/50
Inventor 王树兰王凯文李采果
Owner SHENZHEN TECH UNIV
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