Data auditing and security deduplication cloud storage system and method based on block chain

Abstract

The invention belongs to the technical field of cloud computing, and discloses a data auditing and security deduplication cloud storage system and method based on a block chain. The method comprises four processes of data security deduplication and auditing label generation, probabilistic integrity auditing, intelligent contract arbitration and data decryption. Before data outsourcing, enabling auser to encrypt data by adopting a convergence encryption technology and delete redundant data on a cloud server; verifying the integrity of the outsourcing data by adopting a probabilistic verification method; enabling the intelligent contract to automatically execute verification and fair arbitration of an integrity auditing result, punish the cloud server and compensate corresponding compensation money of the user when the integrity is damaged; and obtaining original plaintext data after the user downloads the data and carries out data decryption operation. The problem that arbitration cannot be automatically executed in traditional data auditing is solved. In addition, the method also supports a ciphertext data deduplication function for protecting the consistency of user data, so thata user can effectively obtain correct plaintext data after decryption is completed.

Description

technical field [0001] The invention belongs to the technical field of cloud computing, and in particular relates to a blockchain-based data audit and safe deduplication cloud storage system and method. Background technique [0002] Cloud computing provides users with flexible computing and storage resources. It greatly reduces the burden of user software and hardware management, thus attracting more and more individual and enterprise users to outsource data and store it on cloud servers. However, due to the outsourced storage of user data on cloud servers, the user's ownership and management rights are separated, which makes it difficult for users to verify the integrity of their sensitive data. In the actual cloud computing environment, various software and hardware failures and the existence of malicious adversaries may lead to malicious tampering or even deletion of sensitive data outsourced on cloud servers. In 2015, the Belgian power grid was hit by lightning, causin...

AI Technical Summary

Problems solved by technology

[0006] (1) The existing data audit scheme can support the integrity audit of user data, but does not consider the issue of fair arbitration, so that even if the user finds that the integrity of his data has been damaged, he still cannot effectively obtain corresponding compensation

[0007] (2) The existing i

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