Cipher searching method based on cloud document system

A cloud storage system, ciphertext technology, applied in special data processing applications, instruments, electronic digital data processing, etc., can solve the problem of low efficiency of index structure, achieve high correlation, ensure privacy security, and ensure the effect of privacy security

Active Publication Date: 2015-03-11
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to propose a ciphertext retrieval method based on the cloud document system, to solve th

Method used

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  • Cipher searching method based on cloud document system
  • Cipher searching method based on cloud document system
  • Cipher searching method based on cloud document system

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Embodiment Construction

[0048] Below in conjunction with accompanying drawing and specific examples, the present invention will be described in further detail:

[0049] refer to figure 1 , in the existing ciphertext retrieval system in cloud storage, the user interacts directly with the cloud server, and the data uploader uploads the encrypted file and keyword trapdoor to the cloud server. When the retrieval user needs to perform retrieval, a required The trapdoor of the search keywords is sent to the cloud server, and the cloud server returns the matched files to the search user according to the search results.

[0050] Since there is no separate index server in this system, the user's file identification is stored on the cloud server in a linear structure or a binary tree structure. In large-scale data storage, the number of elements stored in tree nodes is limited. When the number of files is very large, the depth of the binary tree structure will become very large. When the server retrieves fil...

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Abstract

The invention discloses a cipher searching method based on a cloud document system. The system includes the following achievement steps that 1) a data uploading person encrypts a document and transmits the encrypted document to a proxy server; 2) the proxy server analyzes the document, extracts keywords, calculates the keyword weight of the document, transmits the keyword weight and the keyword trap door to an index server together, meanwhile utilizes a random key to conduct secondary encryption on the document and transmits the document to a storage server; 3) an index server utilizes the keyword trap door to construct a keyword trap door index tree with a binary tree embedded in a B + tree structure; 4) when a searching user conducts keyword searching, the proxy server transmits the keyword trap door to be inquired to the proxy server, and the proxy server searches the index tree to obtain a document identifier meeting the requirements and transmit the document identifier to the storage server; 5) the storage server transmits the corresponding cipher document to a user according to the document identifier, and the user decrypted the cipher to obtain the plain text. The method is high in safety and searching efficiency.

Description

technical field [0001] The invention belongs to the technical field of digital information storage, and in particular relates to a ciphertext retrieval method in cloud storage, which can be used for storage management of a storage system and file retrieval. Background technique [0002] With the increasingly mature development of cloud computing technology, a large amount of private data will be stored on cloud servers. Due to the incomplete trust of the cloud server, in order to protect the security of private data, users need to encrypt files before uploading them. If the encryption operation is not suitable, the efficiency of data utilization will be greatly reduced. When a user wishes to share the uploaded data with other users, appropriate encryption operations will improve the efficiency of file sharing. Shared users may only want to access some files of the data uploader, and submit keywords they are interested in to the server, and the server returns files related ...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06F21/62
CPCG06F16/137G06F16/148G06F21/6272
Inventor 樊凯王朗李晖
Owner XIDIAN UNIV
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