A file update method for separate storage of network information

Abstract

The present invention provides a file update method for separate storage of network information, comprising the following steps: splitting and saving the file, uploading the cloud-separated data block to the cloud after splitting the file; uploading judging step, judging whether the cloud-separated data block is successfully uploaded Go to the cloud, if so, jump to the local saving step, otherwise jump to the step of judging the modification record file; the local saving step, store the local data block and delete the existing modification record file; judge the modification record file step, judge whether there is a modification Record the file, if so, update the modification record file, if otherwise, generate the modification record file, and then jump to the step of modifying the record file; modify the record file step, encrypt and save the modification record. When the invention generates or updates the modification record file, information such as the key required for the encryption transformation operation is extracted from the original cloud-separated data block, and the separated storage protection of the file content can be completely maintained even when there is no network update.

Description

technical field [0001] The invention relates to a file update method, in particular to a file update method for separate storage of network information. Background technique [0002] Separation of network information storage is a secure file storage method used in a network environment, such as a cloud storage system. In this method, in order to protect the security of the file content, the file is not placed in the cloud as a whole, but passed through After content transformation and splitting, part of the file is uploaded to the cloud, and part is left on the local medium; since the file information is separated and stored in different media, any piece of data in the cloud or local cannot recover any content of the file, making Users gain self-management of cloud file security. [0003] However, with the promotion and application of separate storage file systems, problems such as user file updates also arise. Since the separated data blocks are indispensable and stored se...

AI Technical Summary

Problems solved by technology

[0003] However, with the promotion and application of separate storage file systems, problems such as user file updates also arise. Since the separated data blocks are indispensable and stored separately at both ends of the network, when the system processes the user's update of the original file, the In some cases, such as a sudden loss of network connection, or when the security policy does not allow writing to the cloud from the public network, it will cause the problem that the cloud data blocks cannot be updated synchronously; It can destroy the consistency of corresponding data between local and cloud, so effective processing methods are needed to solve this problem

[0004] At present, there are two main file update methods for this problem. One is to use an asynchronous method, which temporarily stores the data blocks that need to be uploaded by the local system, and waits for the system to update automatically when the network environment allows. Since the temporarily stored data cannot be stored in key disk, otherwise it will no longer be separate storage, and the relevant security protection will be invalid. The disadvantage of this method is that the user may bring the key disk and try to read and modify this file elsewhere before the automatic update. Asynchronously updating cloud data blocks will cause complex version management, and the processing is not flexible enough. On the one hand, it is necessary to maintain the corresponding relationship between different versions of files, and at the same time it will waste a lot of space; It is stored in the specified file or database on the key disk, so that the update and storage of the file content does not involve modifying the cloud data. The update does not depend on the network connection, nor does it need complicated version management. The disadvantage of this method is This modification record is not stored separately but is completely stored on the key disk, so the confidentiality is not as good as the original file. In fact, it also reduces the security protection of the file content to achieve file update.

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