| Cloud storage provides users with an efficient method of storage,but in this scenario,users cannot directly manage their data,which may increase data security risks.Integrity auditing mechanisms can help users remotely verify the integrity of their data and avoid damage caused by human error or accidents.Blockchain-based data integrity auditing technology has emerged that users’ operation information and file metadata are stored on the blockchain,ensuring that the auditing results are tamperproof and the auditing process is traceable.However,blockchain systems may exhibit multi-party control behavior due to their distributed nature,and there may be instances where nodes on the chain do not participate in bookkeeping or auditing.Therefore,appropriate incentive mechanisms are needed to ensure the continuous operation of the data integrity auditing system.(1)Incentive schemes of existing cloud storage audit cannot achieve the anonymity of auditors and adopt linear credit scores mechanism,which lead to a gap between rich and poor,and damage the interests of new nodes.A two-stage incentive mechanism to support the cold start of new nodes,IMSNP,is proposed in this paper.Specifically,Some algorithms,such as the auditor’s anonymity mechanism,differential floating pricing algorithm,and nonlinear reputation score calculation method,are designed to increase the probability of new nodes being selected,thereby attracting new nodes to join the audit.Experiments show that after multiple rounds of bookkeeping,the gap between the rich and the poor between old and new nodes decreases,and IMSNP supports a large degree of cold start of new nodes.(2)The existing cloud storage audit incentive scheme does not take into account the interests of bookkeeping nodes and thus affects the fairness of the system.A fair incentive mechanism for full-chain nodes,FIMFN,is proposed in this paper.Through an evolutionary game model and local stability analysis,a basis is provided for the design of incentive mechanism parameters.The experimental results show that when the distribution coefficient is within a certain range,the incentive mechanism can make both audit nodes and bookkeeping nodes participate in the audit task,thus ensuring the robustness and security of the system.(3)The existing blockchain-based cloud storage security audit system cannot guarantee the interests of new nodes and bookkeeping nodes,this paper designs and implements a blockchain-based fair cloud storage security audit scheme system SAFSB.Compared with the existing cloud storage security audit scheme,SAFSB supports cold start of new nodes and guarantees the fairness of each node in the blockchain.The storage of audit results on the blockchain can also prevent tampering. |
