Cloud storage service, an Internet hosting service aimed at offering consumers the possibility to upload their files to the service providers' facilities and access them at any time, from anywhere via Internet, becomes a better way of providing individuals and organizations with a set of services and facilities to store and/or share their files. As such, it has led to a specialised cloud computing business and service delivery model known as Storage-as-a-Service. However, since cloud consumers'

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... important files have to be stored in the cloud storage service providers' premises, the confidentiality of these stored files becomes a real issue. In this paper, different solutions to solve this issue have been proposed.