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.

云计算和超高速互联网的迅速普及，促进了数据共享和协同办公的蓬勃发展，特别是在大数据和人工智能领域。为了保护用户数据的安全性，研究人员开发了PDP方案来验证数据。但是，现有方案都依赖于半信任的第三方审计员（TPA）或组管理来存储验证信息。为了解决这个问题，我们提出了一种基于区块链的分布式数据完整性审计方案。该方案提供了一种全新的方法，该方法使客户无需依赖任何特定的TPA即可安全地存储数据，并以较低的成本保护用户的隐私。针对这一新概念，指出了现有方案存在的问题，并提出了系统模型和安全模型。然后，设计了一种使用区块链的分散数据完整性审计方案。所提出的基于区块链的私有PDP方案被证明是安全的。同时，安全性分析和效率分析表明所提出的PDP方案是安全，高效和实用的。