Decentralized data outsourcing auditing protocol based on blockchain

Abstract

The rapid popularization of cloud computing and ultra-high-speed Internet has promoted the vigorous development of data sharing and collaborative office, especially in Big Data and AI. Aiming at protecting the security of users’ data, researchers developed PDP scheme to verify data. However, existing schemes all rely on semi-trusted Third Party Auditor (TPA) or group management to store verification information. In order to solve this problem, we propose a distributed data integrity audit scheme based on blockchain. This scheme provides a brand-new method, which allows customers to store data safely without relying on any specific TPA and protect users’ privacy at a lower cost. For the new concept, this paper points out the problems of the existing scheme and puts forward system model and security model. Then, a decentralized data integrity audit scheme using blockchain is designed. The proposed private PDP scheme based on blockchain is provably secure. At the same time, the security analysis and efficiency analysis show that the proposed PDP scheme is safe, efficient and practical.