Abstract:
Storage-as-a-Service offered by cloud service providers (CSPs)
is a paid facility that enables organizations to outsource their sensitive data
to be stored on remote servers. In this paper, we propose a cloud-based storage
scheme that allows the data owner to benefit from the facilities offered by the
CSP and enables indirect mutual trust between them. The proposed scheme has four
important features: (i) it allows the owner to outsource sensitive data to a
CSP, and perform full block-level dynamic operations on the outsourced data,
i.e., block modification, insertion, deletion, and append, (ii) it ensures that
authorized users (i.e., those who havethe right to access the owner’s file)
receive the latest version of the outsourced data, (iii) it enables indirect
mutual trust between theowner and the CSP, and (iv) it allows the owner to
grant or revoke access to the outsourced data. We discuss the security issues
of theproposed scheme. Besides, we justify its performance through theoretical
analysis and a prototype implementation on Amazon cloud platform to evaluate
storage, communication, and computation overheads.
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