Cloud-storage-oriented trusted storage verification method and system

Abstract

The invention discloses a trusted storage verification method and a trusted storage verification system for cloud storage and belongs to the technical field of computer software. In the method and the system, before a file is transmitted to an untrusted cloud storage server, a series of random positions are generated according to the key held by a user and other generated related verification parameters, the contents at the random positions in the file are read, a plurality of verification labels are generated for the file, and all necessary parameters are stored and maintained; and when the storage state of the file is required to be checked, a user can initiate an interaction process with a cloud storage system according to related parameters, and the cloud storage system can generate new verification labels again according to parameters corresponding to the verification. In the method disclosed by the invention, a higher verification reliability can be acquired at a lower computingcost, the contents at different positions in the file are selected at each time of generation of the file verification labels, and different keys are adopted to prevent a server from generating a correct signature by using a stored correct signature or by storing the file contents at a specific position.

Description

technical field [0001] The invention relates to a trusted storage certification method and system for cloud storage, which can be used for trusted verification of the existence and correctness of data stored in the cloud, and belongs to the technical field of computer software. Background technique [0002] With the continuous growth of individual and business users' demand for file storage, the application of various cloud storage and network systems has received more and more attention. This type of storage system can provide enterprises and individual users with massive data file storage and management services at a relatively low price without requiring users to perform special maintenance and management of the file storage system, so it has been welcomed by the market in recent years. [0003] However, in the past two years, Google, Amazon and other large cloud computing manufacturers have experienced various security failures that show that cloud storage systems are no...

AI Technical Summary

Problems solved by technology

There are two problems faced by this method: one is the efficiency problem, each verification process needs to access all the document content and calculate the signature for it, so the access and calculation cost of large documents is high; the second and more important is There are security risks

If the server retains the Hash value H(D) of the document (D) for efficiency reasons, and generates a signature based on this value each time, then the final signature result cannot reflect the real situation of the current document

If the cloud storage service provider does it maliciously, the user may not be able to find that the document has been tampered with until the access to the document fails

[0005] In short, the current cloud storage system lacks credible and efficient verification methods for the existence and correctness of user data, so a rapid detection method is needed to help users confirm whether the massive files stored in the cloud storage system have not been damaged

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