Storage method, system and device

Abstract

The invention discloses a storage method, a system and a device, wherein the method includes that storage keys are used for performing encryption storage to data files; the storage keys are encrypted in two different kinds of encryption modes to form a personal key and a data key; a storage key can be obtained after the personal key is decrypted with a key of users to whom the data files belong as a decryption key; a storage key can be obtained after the data key is decrypted with the data files before the encryption as a decryption key; the encrypted data files, the personal key and the data key are stored; whether identical data files exist in stored data files is determined before data files of a novel user are stored; and the data files are not stored repeatedly if identical data files have already been preserved before, the data files are used for decrypting the data key to obtain a storage key, and a key of the novel user is used for encrypting the storage key to form a personal key of the novel user. According to the technical scheme provided by the embodiment of the storage method, the system and the device, both the repeated storage of identical data files can be avoided, and any other users including cloud storage service providers are guaranteed to be unable to access plaintext data.

Description

technical field [0001] The present invention relates to cloud storage technology, in particular to a storage method, system and device. Background technique [0002] Cloud storage has increasingly become a trend. The so-called cloud storage 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, grid technology, or distributed file systems. A system that jointly provides data storage and business access functions to the outside world. [0003] For cloud storage service providers, in order to optimize the use of storage space, when a large number of users upload a large amount of data, they do not actually accept the upload of the same file. For example, A has already stored the B file, if the file stored by B is found to be a B file during uploading and scanning, it will not be uploaded in fact, but simply add the existing B file to B's with...

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, in order to ensure that another user can access the same file after adding it to another user’s account, the common practice is to encrypt the file with a symmetric key and store the key in the server for a long time ; If encrypted with an asymmetric key, the service provider must also know the private key, otherwise it cannot increase the access rights of the data file to another user

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