Ain Shams University
Providing cloud services gets an increasing interest of both scientific and industrial applications today. Storage services are the fundamental component of the Cloud computing paradigm. Exploiting such storage services enables users to outsource their data into the cloud. Not only is the reduction of storage and maintenance costs achieved but gets rid of the required infrastructure burden as well. How to prevent data abuses it by the cloud remains a hot point of the research. As there is a lack of trust between the service providers and clients, a set of challenges of securing the outsourced data against being abused is popped up.