Data security using data slicing over storage clouds

Currently there are several cloud systems which provide storage as a service which are PaaS systems. They provide access to their services via web services. In this research, we pro-posed a unification framework that integrates different IaaS cloud layers in order to collaborate storage space of two or more storage clouds. We build a virtual storage area network (VSAN) by distributing files to all these clouds. However, our proposed system calls for open research questions which must be answered such as: How can we access data from public storage clouds? How can we provide security to the files being uploaded on cloud storage? And how we can create Virtual Storage area network using available storage clouds? This paper proposes a middleware system that authenticates users and uses storage cloud systems such as DropBox, Box.net and OneDrive as backend storage. We provide a layer of security above these storage systems by distributing the storage to each cloud We also encrypt each segment being distributed Our middleware split a file being uploaded into segments, encrypt them and then upload each segment to each backend cloud storage. The system maintains all these segmentation, encryption and distribution information and user information to the systems database. When user want to download a file, system again recreate the original uploaded file and allow downloading it. We use web services or web APIs provided storage clouds for implementing this system.