Method and system for semantic expansion search of encrypted outsourcing data in cloud environment

Abstract

The invention discloses a method for the semantic expansion search of encrypted outsourcing data in a cloud environment. The method comprises the following steps of: sending a cipher text document setand a safety index set to a public cloud server, sending a document mark vector set to a private cloud server and sending a secret key to an authorized user by a data owner; sending a query mark vector to the private cloud server and sending a trap door to the public cloud server by the authorized user to complete a search request; matching the document mark vector with the query mark vector by the private cloud server to obtain a candidate index identifier set meeting query requirements of users and sending the candidate index identifier set to the public cloud server; and finding the corresponding safety index set through the received candidate index identifier set and the trap door, calculating and sorting similarity scores of documents and returning cipher text documents meeting the conditions to the authorized user by the public cloud server. The method has the advantages that the expense of the users is reduced while the privacy of the users is protected at the same time.

Description

technical field [0001] The present invention relates to the technical field of cloud computing security, in particular to a semantic extension search method and system for encrypted outsourced data in a cloud environment. Background technique [0002] At present, with the rapid development of cloud computing technology, cloud computing has become a new industrial structure. More and more people choose to outsource some sensitive data to the cloud, and begin to enjoy its flexibility and high-quality data storage services, and uploading data to the cloud will reduce the user's data storage and maintenance costs. However, data security issues in the cloud environment have attracted a lot of attention. In order to protect data security, it is a common method to encrypt data and then upload it to the cloud. Data encryption makes the data no longer have the original attributes, which makes the traditional retrieval mechanism invalid. As the amount of data increases, how to effic...

AI Technical Summary

Problems solved by technology

There is no distinction between the keywords appearing in the title and the text. All documents are regarded as a domain, and the created index cannot accurately reflect the weight of keywords in the article, resulting in inaccurate search results.

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