Data access method and system with auditing function and base on cloud server

Abstract

The invention relates to a data access method and system with an auditing function and base on a cloud server. The method comprises the following steps: a data user terminal generates an encryption key, encrypts a file block and stores encrypted data in the cloud server; the data user terminal provides a data extraction request and the time t of the encryption key for the cloud server, the cloud server returns decrypted data to the data user terminal; and an authorization user terminal sends an authorization request to the data user terminal, the data user terminal encrypts the time t of the encryption key to obtain an encrypted authorization request t-sign and returns the encrypted authorization request t-sign to the authorization user terminal, the authorization user terminal sends the data extraction request and the t-sign for the cloud server, the cloud server performs decryption to obtain t', and returns the decrypted data to the authorization user terminal when determining that the t' is equal to the time t, and otherwise, performs no decryption. The invention provides a data extraction scheme of the authorization user terminal and verifies the identity of the authorization user terminal by using the time of the encryption key, and thus the security of the data access method is improved.

Description

[0001] This application is a divisional application with an invention title of "A Cloud Server-Based Data Access Method and System". The filing date of the original application is 2017.2.24, and the application number is 201710105793.7. technical field [0002] The invention relates to the field of encryption technology, in particular to a cloud server-based data access method and system with an audit function. Background technique [0003] Cloud storage is an important device in cloud computing, which allows data users to transfer their local data to cloud servers, and local users can delete the data after ensuring that the cloud server stores the local data correctly. Data users may worry about the risk of data loss in the cloud server, because no matter how reliable the cloud server is, it has the possibility of being attacked by the outside world, and sometimes even the cloud server may be a malicious cloud, That is, a malicious cloud, when it processes data, the audit q...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a cloud server-based data access method and system for the lack of a safe and effective solution for extracting data by non-local users in the prior art. Authentication to provide non-local authorized users to extract data schemes

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