Abstract
Multi-cloud storage is a promising platform to offer resilient solution for clients in financial or confidentiality aspects. The research of provable data possession (PDP) schemes has long been a popular topic in the perspective of enhancing trust between clients and clouds. For multi-cloud, the works almost rely on centralized agent server called organizer to control the clouds and third party auditor (TPA) to realize public verification and reputation system. However, such centralized structure brings in the risk of collusion attack that malicious clouds can collaborate with TPA to deceive the client. This paper tries to explore a new way to construct decentralized integrity and reputation audit (DIRA) scheme, by taking advantage of improved blockchain with two-step transaction validation and removing all the centralized structure from the multi-cloud storage. The analysis shows that the DIRA scheme obtains the resistance to collusion attack.
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