Data integrity auditing method and system based on block chain

Abstract

The invention discloses a data integrity auditing method based on a block chain. The method comprises the steps of a client sending an auditing request to a block chain platform; the block chain platform generating p non-repeated random numbers after receiving the auditing request from the client; using all p random numbers {s1, s2}; s2,... Sp} as the index numbers; respectively obtaining the block numbers v stored at corresponding positions in a mapping array of the block chain platform, all the block numbers forming a challenge array; packaging the challenge array in an audit challenge request, sending the audit challenge request to the server; and the server analyzing the audit challenge request from the block chain platform to obtain a challenge array, traversing the challenge array to obtain a sub-block mj and a label j corresponding to each element j, and performing operation on the element j, the sub-block mi and the label i according to a bilinear operation algorithm. According to the invention, the block chain platform is used as a third auditing party, and the data integrity and the auditing security are improved.

Description

technical field [0001] The invention belongs to the field of computer security, and more specifically relates to a method and system for auditing data integrity based on blockchain. Background technique [0002] Cloud storage is an online storage developed on the basis of cloud computing. It has many advantages, such as reducing the burden of local storage, network backup, and low cost. Therefore, more and more users and enterprises choose to store data in cloud storage. However, while cloud storage provides users with convenient services, it also faces many new security challenges, mainly reflected in the fact that users cannot participate in the decision-making of data access, and whether the files are truthfully stored in the cloud storage provider (Cloud Storage provider, CSP for short) is doubtful, so it is necessary to audit the data stored in the cloud by the user (Audit), the main goal of which is to confirm that the user data is stored on the server without obtaini...

AI Technical Summary

Problems solved by technology

[0004] However, there are some technical problems that cannot be ignored in the above-mentioned audit method based on a trusted third party: In a real network environment, the audit third party may be coerced by cyber attackers, or conspired with the CSP, resulting in the final audit report issued by the audit third party. The results are unreliable and further affect the accuracy of user data verification results

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