Public auditing method supporting composite data

Abstract

The invention discloses a public auditing method supporting composite data, and relates to the field of data security in cloud computing. The method comprises the following steps: generating a publicand private key pair according to system parameters; generating a label for a single-user data block based on a private key of the single-user public and private key pair, and storing the label to a cloud server; based on the private key of a multi-user public and private key pair, generating a label for a data block generated by multi-user cooperation, and storing the label to the cloud server; an auditor generating challenge information and sending the challenge information to the cloud server; the cloud server finding corresponding data blocks and labels thereof according to the challenge information, generating response evidences and sending the response evidences to the auditor; and the auditor judging whether the data blocks are well stored according to the response evidences to finish auditing. According to the method, the number of participating members is not limited when the multi-user data is generated, the single-user data and the multi-user data can be audited at the sametime, data privacy protection and identity privacy protection are achieved in the auditing process, and identity tracing of a data block generator is achieved.

Description

technical field [0001] The invention relates to the field of data security in cloud computing, in particular to a public audit method supporting compound data. Background technique [0002] Cloud computing has won the favor of many users with its powerful computing power and storage capacity. The user outsources the data to the cloud server, which is stored and managed by the cloud server, which releases the pressure on the user to maintain the data locally. In recent years, frequent cloud data security incidents have reduced the public's trust in cloud service providers and limited the promotion and application of cloud computing. Data on the cloud may be lost, so it is necessary for users to check whether the data is well preserved. [0003] Multiple users form a group, and group users can upload data to the cloud, and other members of the group can access data on the cloud, thereby realizing data sharing. Usually, members in a group know each other, and group members c...

AI Technical Summary

Problems solved by technology

Currently, existing shared data audit algorithms only support one data generation method, most of which only support group members to generate data independently, and a few algorithms only support a fixed number of group members to collaborate to generate data

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