SIOCEN: Secure Integrity Verification of Outsourced Data in Cloud Storage using Blockchain

Storing large volumes of data is a bottleneck on edge devices. Thus, Cloud Storage Technologies have emerged as a viable alternative for large-scale data storage. However, the data owner loses control of the file (once uploaded), which may lead to data integrity issues. Even though there are existing schemes to check the integrity of the files using a thirdparty auditor, they rely on the unrealistic assumption that the auditors are completely trustworthy. It has been reported in many works of literature that auditors sometimes collude with the cloud server to cheat the system. In this paper, we propose a scheme named secure integrity verification of outsourced data in cloud storage using blockchain (SIOCEN) which protects the system from entity collusion. Using smart contract, we enforce the incentive mechanism in the scheme, which is the most appealing feature of the SIOCEN that increases fairness. The security of the proposed scheme is analysed and proved to be secure. We implement the SIOCEN system on Ethereum network and do a performance analysis, showing the effectiveness of the proposed system.