The public cloud storage auditing with deduplication has been studied to assure the data integrity and improve the storage efﬁciency for cloud storage in recent years. The cloud, however, has to store the link between the ﬁle and its data owners to support the valid data downloading in previous schemes. From this ﬁle-owner link, the cloud server can identify which users own the same ﬁle. It might expose the sensitive relationship among data owners of this multi-owners ﬁle, which seriously harms the data owners’ privacy. To address this problem, we propose an identity-protected secure auditing and deduplicating data scheme in this paper. In the proposed scheme, the cloud cannot learn any useful information on the relationship of data owners. Different from existing schemes, the cloud does not need to store the ﬁle-owner link for supporting valid data downloading. Instead, when the user downloads the ﬁle, he only needs to anonymously submit a credential to the cloud, and can download the ﬁle only if this credential is valid. Except this main contribution, our scheme has the following advantages over existing schemes. First, the proposed scheme achieves the constant storage, that is, the storage space is fully independent of the number
Cluster Computing – Springer Journals
Published: Jun 1, 2018
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