A cloud data outsourcing and integrity verification method and device supporting preprocessing

Abstract

The invention provides a cloud data outsourcing and integrity verification method supporting preprocessing, which comprises the following steps that: a data outsourcer selects a security parameter andan anti-collision hash function to generate a public key and a private key; The data outsourcer executes a first pre-calculation process according to the public key to generate offline data processing parameters; The data outsourcer executes a data processing process according to the private key and the offline data processing parameters, generates processed data and data labels and uploads the processed data and data labels to the cloud storage server; The data verifier executes a second pre-calculation process according to the public key and the data label to generate an offline data verification parameter; The data verifier verifies the data label of the outsourced data according to the public key of the data outsourcer and the offline data verification parameter, and generates a challenge if the data label of the outsourced data is legal; The cloud storage server responds to the received challenge calculation according to the stored outsourcing data; And the data verifier verifiesthe received response according to the public key and the offline data verification parameters so as to judge the integrity of the corresponding outsourcing data.

Description

technical field [0001] The invention relates to the field of information security encryption, in particular to a cloud data outsourcing and integrity verification method and device supporting preprocessing. Background technique [0002] With the rapid development of cloud computing technology, cloud computing technology is gradually accepted and used by the majority of users. However, once the user uploads the data to the cloud storage server, the user's control over the data will be transferred to the cloud storage server. If the cloud storage server modifies or deletes user data, it will be difficult for the user to detect or obtain evidence. Against this background, a large number of cryptographic schemes have been proposed to secure data stored in the cloud. [0003] In the existing public verifiable cloud data integrity verification scheme, the data outsourcer needs to process the data before uploading the data. relevant. In addition, after the data is uploaded to t...

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a cloud data outsourcing and integrity verification method and device that support preprocessing, aiming to solve the problem that devices with weak computing capabilities are difficult to efficiently process in cloud data outsourcing scenarios Data and Verification Integrity Issues

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