Decentralized Data Integrity Verification Model in Untrusted Environment

Outsourced data, as an significant component of cloud service, has been widely used due to its convince, low overhead and high flexibility. To guarantee the integrity of outsourced data and reduce the computational overhead, data owner (DO) usually adopts a third party auditor (TPA) to execute verification scheme. However, handing over the verification of data to TPA may lead to security vulnerabilities since the TPA is not fully trusted. In this paper, we propose a novel solution for data integrity verification in untrusted outsourced environment. Firstly, we design a decentralized model based on blockchain, consisting by some collaborative verification peers (VPs). Based on our purposed model, we present an advanced data integrity verification algorithm, allowing DO stores and checks verification results by writing and retrieving the blockchain. Moreover, each VP maintains a replication of the entire blockchain to avoid maliciously tampering with. We evaluate our proposed approach on real outsourced data service scenario. Experimental results demonstrate that our proposed approach is efficient and effective.