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ABSTRACT
Data de duplication is one of important data compression techniques for eliminating
duplicate copies of repeating data and has been widely used in cloud storage to reduce
the amount of storage space and save bandwidth. To protect the confidentiality of
sensitive data while supporting de duplication, the convergent encryption technique has
been proposed to encrypt the data before outsourcing. To better protect data
security, this project makes the first attempt to formally address the problem of
authorized data de duplication. Different from traditional de duplication systems, the
differential privileges of users are further considered induplicate check besides the data
itself. We also present several new de duplication constructions supporting authorized
duplicate check in hybrid cloud architecture. Security analysis demonstrates that our
scheme is secure in terms of the definitions specified in the proposed security model. As
a proof of concept, the proposed work implements a prototype of our proposed
authorized duplicate check scheme and conduct test bed experiments using our
prototype. The proposed work shows that our proposed authorized duplicate check
scheme incurs minimal overhead compared to normal operations.
