Data secure access method used for cloud storage and user terminal system

Abstract

The invention discloses a data secure access method used for cloud storage. When storing data, a user terminal divides an original file as a big data block and a small data block, and stores the small data block and file division information at local, the big data block is encrypted and transmitted to a cloud storage system, and encrypted information is stored at local. When retrieving the data, the cloud storage system transmits the encrypted big data block to the user terminal according to a user terminal request, and the user terminal carries out decryption by utilizing the encrypted information stored at local and splices the small data block and the decrypted big data block into the original file according to the file division information. In file division, a mode of extracting data with a fixed magnitude can be employed, and a mode of extracting data with an unfixed magnitude can be employed too. Further, a strategy of hierarchical encryption is employed in data encryption, thus system spending is reduced. The invention also discloses a user terminal system used for the cloud storage. According to the method and the system, the security of user data can be greatly raised with low cost.

Description

technical field [0001] The invention relates to a data security access method and a user terminal system for cloud storage, and belongs to the cross application field of information technology of distributed computing, information security and computer software. Background technique [0002] Cloud storage is an extension and development of the concept of cloud computing. It refers to the collection of a large number of different types of storage devices in the network through application software to work together through functions such as cluster applications, distributed computing, or distributed file systems. And through various corresponding application software or application interfaces, it jointly provides a complex storage resource pool system with intensive data storage and business access functions for multiple tenants. [0003] The core root of data security issues in cloud storage systems is the separation of data management rights and ownership. The data belongin...

AI Technical Summary

Problems solved by technology

However, these methods have brought a lot of overhead in the actual data operation process, and because the complete data is hosted in the cloud storage system, there is still a risk of being cracked, and the privacy protection of user data cannot be fully realized.

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