Abstract
AbstractThe semi-trusted servers in cloud environment may outsource the files of their clients to some low expensive servers to increase their profit. To some extent, such behavior may violate the wishes of cloud users and impair their legitimate rights and interests. In this paper, a probabilistic challenge-response scheme is proposed to prove that the clients’ files are available and stored in a specified cloud server. In order to resist the collusion of cloud servers, common cloud infrastructure with some reasonable limits, such as rational economic security model, semi-collusion security model and response time bound, are exploited. These limits guarantee that a malicious cloud server could not conduct a t-round communication in a finite time. We analyze the security and performance of the proposed scheme and demonstrate that our scheme provides strong incentives for economically rational cloud providers against re-outsourcing the clients’ data to some other cloud providers.KeywordsCloud storageEconomical server collusionStorage securityProbabilistic scheme
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