Blockchain-Based Incentive and Arbitrable Data Auditing Scheme

The private data possession of proof mechanism is an important means to ensure the security of cloud data. Using the private data possession of proof mechanism may cause disputes between users and cloud storage service providers. There is no credible proof to determine the wrong party, it will affect the public's confidence in using cloud storage technology. Therefore, this paper designs an incentive and arbitrable data audit protocol based blockchain. This protocol uses the quadratic residue theorem to achieve efficient auditing. The smart contract is introduced as a fair arbitrator, the blockchain is used as a self-recording channel to provide credible proof for the contradiction between users and cloud storage service providers, avoid disputes and realize dispute-free arbitration. A set of reward and punishment measures are designed using power functions to restrain the malicious behavior of untrusted users and cloud storage service providers. Efficiency analysis and experiments show that the proposed scheme has lower computational and communication overhead.