Efficient privacy protection encrypted message querying method in cloud environment

A privacy protection and query method technology, applied in digital data protection, encryption devices with shift registers/memory, instruments, etc., can solve the problem of large data volume, user interaction, privacy protection cloud environment, low efficiency, and inability to take into account ciphertext at the same time Query privacy protection, space-time efficiency, and multi-keyword query to achieve the effect of ensuring query privacy protection, improving space-time efficiency, and ensuring high accuracy

Active Publication Date: 2013-10-09
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods generally have problems such as low efficiency, and cannot take into account the privacy protection of ciphertext query, space-time efficiency, an

Method used

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  • Efficient privacy protection encrypted message querying method in cloud environment
  • Efficient privacy protection encrypted message querying method in cloud environment
  • Efficient privacy protection encrypted message querying method in cloud environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0057] Step 1: The data contributor builds a bucket-based ciphertext index based on the dataset on the client side, then encrypts the dataset, and finally publishes the ciphertext data and ciphertext index to the cloud:

[0058] Specific steps are as follows:

[0059] 1) The data contributor U performs word segmentation on each document in the data set D on the client side, and combines the plaintext index word sets obtained by each document word segmentation to obtain the plaintext index word set W corresponding to all documents;

[0060] 2) Optimize the obtained plaintext index word set, that is, remove the repeated index words in all index words, and obtain the optimized plaintext index word set W, W={w i |i=1,2,...,n};

[0061] 3) The data contributor encrypts the key key with the index word 1 Perform one-way encryption on all plain...

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Abstract

The invention relates to an efficient privacy protection encrypted message querying method in a cloud environment and belongs to the field of credible data management. The method comprises the following steps that (1) a data contributor establishes an encrypted message index based on a barrel according to a data set at a client side, then the data set is encrypted, and lastly encrypted message data and the encrypted message index based on the barrel is sent to a cloud end; (2) a query user submits a query request to a cloud end, the cloud end carries out query on the encrypted message index based on the barrel, and returns query results meeting conditions to the query user. According to the efficient privacy protection encrypted message querying method in the cloud environment, regarding the credible cloud environment, under the premise that data privacy of the user is protected, the efficient encrypted message index based on the barrel is established to ensure the high accuracy of the querying results, and the time and space efficiency of encrypted message query is improved.

Description

technical field [0001] The invention relates to a privacy protection ciphertext query method, in particular to an efficient privacy protection ciphertext query method in a cloud environment. Background technique [0002] Secure data outsourcing management in the cloud environment, that is, the data contributor encrypts the data at the local trusted front-end and then outsources it to the cloud service provider for storage, management and maintenance. When the user accesses the data, he first obtains the required encryption from the cloud. Text data, and then decrypted at the trusted front end to obtain plaintext data. Although trusted front-end data encryption and decryption can effectively guarantee user data security and privacy protection, ciphertext data query has become an important challenge because it no longer has the characteristics of plaintext query. [0003] The ciphertext query in the cloud environment has the following two requirements: on the one hand, in ord...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06F21/62H04L9/06
Inventor 彭智勇程芳权宋伟
Owner WUHAN UNIV
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