Block Chain-Based Data Audit and Access Control Mechanism in Service Collaboration

Abstract

In the context of big data, cloud storage services provide users with the ideal data storage service. But external store of data causes cloud storage service providers gain control of the data. Therefore, our work should consider how to ensure the privacy of data and maintain the integrity of data when enjoying convenient services. This paper builds a blockchain-based solution through research on cloud storage service model and blockchain technology. And related protocols are built on the solution-based architecture. In our solution, the decentralized model solves the single point of trust problem in the traditional data auditing service model by collective trust. A public agreement enables auditors to efficiently build proof of data integrity without touching data. The protocol allows users to trace the history of their data, and examine whether the owner of the data guarantees the privacy of the data in an after-the-fact audit. In addition, our work constructed the prototype system of the scheme and revealed the effectiveness of the scheme through system testing.