A cross-domain authentication and fair audit deduplication cloud storage system based on a block chain

Abstract

The invention belongs to the technical field of cloud computing, and discloses a cross-domain authentication and fair audit duplicate removal cloud storage system based on a block chain. The system comprises a cross-domain authentication module, a data encryption module, a ciphertext duplicate removal module, an integrity audit module and a server punishment module. In the authentication module, acloud user generates a certificate at a client in a self-signed mode, the certificate is stored in a block chain network after being verified by an authentication server, the user is verified to compare information such as the certificate and a block, and whether the certificate is valid or not is verified. According to the method, the problem of hierarchical query verification of a traditional PKI structure is avoided, the authentication frequency is greatly reduced, and the verification cost is reduced; By using an intelligent contract, a malicious server is punished to receive certain penalties and compensate users with impaired benefits under the condition that user data is damaged; And in the duplicate removal module, a data duplicate removal function is realized by using a convergence encryption technology, so that the cloud server is prevented from storing too much duplicate data, and the user and the cloud server are prevented from consuming a large amount of calculation expenditure and storage expenditure.

Description

technical field [0001] The invention belongs to the technical field of cloud computing, and in particular relates to a blockchain-based cross-domain authentication and fair audit deduplication cloud storage system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] As a pay-per-use model, cloud computing enables users to enjoy endless computing and storage services anytime and anywhere, realizing the people's long-standing dream of using computing as a resource. With the rapid development of cloud computing, more and more users and enterprises tend to outsource and store data on cloud servers and use the cloud to exchange and share data with other users. Since users often need to authenticate their identities before exchanging data, the certificate authentication center that traditional cross-domain authentication schemes rely on in the cloud environment is easily damaged, which makes traditional cross-...

AI Technical Summary

Problems solved by technology

[0007] (1) Existing cross-domain authentication schemes place excessive trust in a single certificate authentication center. However, a single certificate authentication center is easily damaged in a cloud environment, and it is difficult to provide correct authentication services when a single certificate authentication center is destroyed.

On the other hand, traditional cross-domain authentication schemes use hierarchical authentication, which is inefficient and difficult to quickly authenticate user certificates

[0008] (2) Due to various software and hardware failures and the existence of malicious opponents, the data stored by users on the cloud server is extremely vulnerable to damage. When the user's data is destroyed, the user still needs to pay high storage fees to the cloud server. is extremely unfair

However, the existing data integrity auditing scheme does not realize the punishment of malicious servers and the compensation of users whose interests are damaged. How to realize fair integrity auditing is an unresolved problem faced by data auditing.

[0009] (3) The existing cloud storage system still lacks cross-domain authentication and fair audit functions that support deduplication. How to implement a cross-domain authentication and fair audit system that supports deduplication is a problem to be solved in cloud storage systems

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