Attribute-based connection keyword search method in multi-data owner environment

A technology for data owners and owners, applied in the field of keyword search, can solve problems such as reducing the computing cost of the client and increasing the number of keywords linearly

Active Publication Date: 2020-05-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the size of the trapdoor grows linearly with the number of keywords and reduce the computing cost of the client, the present invention provides an attribute-based connection keyword search method in a multi-owner environment

Method used

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  • Attribute-based connection keyword search method in multi-data owner environment
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  • Attribute-based connection keyword search method in multi-data owner environment

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Embodiment Construction

[0049] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0050] Consider a cloud storage system that implements join keyword search and fine-grained access control. The system includes multiple data owners, multiple query users, cloud servers and trusted authorization centers. The trusted authorization center is responsible for system initialization, generating system public parameters and master keys, and at the same time generating attribute private keys for query users. Data owners manage files and generate indexes. Query users to generate trapdoors for searching. The cloud server stores file ciphertext and file index, and uses powerful computing power to help users search.

[0051] The parameters involved in this method are defined as:

[0052] Table 1 Parameter definition

[0053]

[0054] The following are the specific implementation steps:

[0055] 1. System initialization.

[0056] Let H: {0, 1) * → ...

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Abstract

The invention relates to an attribute-based connection keyword search method in a multi-owner environment, which comprises the following steps of keeping the length of a trap door unchanged when the number of keywords is linearly increased by using an aggregation technology; encrypting a keyword set by adopting a linear secret sharing matrix (LSSSS) type access structure, so that the calculation efficiency is relatively high on the premise of ensuring the expressive force; and meanwhile, the search results are sorted by utilizing the correlation scores, so that the search accuracy is improved.

Description

technical field [0001] The invention relates to a keyword search method, in particular to an attribute-based connection keyword search method in a multi-data owner environment. Background technique [0002] The document "Attribute Encryption Scheme Supporting Keyword Arbitrary Link Search, Journal of Communications, 2016 (8): 77-85" discloses an attribute-based keyword arbitrary link search method. This method uses polynomial equations to realize the keyword arbitrary connection query without fixing the keyword position, which makes the keyword connection search more flexible; at the same time, combined with attribute-based encryption technology, it realizes fine-grained access control, and each index is used by multiple query users. Search reduces the network bandwidth and processing overhead of sending nodes brought about by fine-grained access control. However, in this method, the size of the trapdoor increases linearly with the number of keywords, and it is difficult to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/62G06F21/60G06F16/14G06F16/13
CPCG06F21/6227G06F21/602G06F16/148G06F16/156G06F16/13G06F2221/2107
Inventor 李慧贤杨葆哲马勇庞辽军穆群英刘黎明
Owner NORTHWESTERN POLYTECHNICAL UNIV
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