Method for searching multi-domain connection keywords on basis of MDB+ tree under cloud environment

Abstract

The invention discloses a method for searching multi-domain connection keywords on basis of an MDB+ tree under cloud environment. The method comprises the following steps of: constructing each data record into a MDB+ tree-based safety index by a data owner; encrypting a document corresponding to each data record; outsourcing the encrypted indexes and encrypted documents to a cloud server; requesting search authorization from the data owner by a data user; deciding whether to carry out authorization by the data owner according to an authorization rule; if the user obtains authorization, distributing a search trap door and a decryption secret key to the data user by the data owner; submitting the search trap door to the cloud server by the data user; and when the cloud server receives the search trap door submitted by the user, searching the MDB+ tree by utilizing a matching algorithm so as to obtain all the records matched with a user query requirement. The method has the beneficial effects of ensuring the user privacy and data safety, rapidly satisfying the query required by the user, and overcoming the defects of linear query of the past vast majority of schemes.

Description

technical field

[0001] The invention belongs to the technical field of cloud storage encrypted search, and specifically relates to an MDB-based + A search method for multi-domain join keywords in a tree. Background technique

[0002] With the rapid development of information technology, cloud computing has attracted more and more attention. Although cloud computing can provide powerful storage and computing capabilities, outsourced servers such as cloud computing are maintained and managed by third-party Internet commercial companies (such as Amazon, Google, etc.). Many companies and organizations are cautious about cloud computing. It is they who are concerned about the security of their data and the privacy of their users.

[0003] In recent years, with the continuous development of medical informatization, the number of Electric Medical Records (EMRs for short) is increasing. How to effectively store and manage the increasing EMRs is a problem faced by many hospitals an...

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