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Abstract:The Cloud Computing is a next generation platform, which provides virtualization with resource pool.There are three types of cloud service models, Infrastructure as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS).Most of the scientific research focus on IaaS model, which manage virtualization and storage. IaaS allows customer to scale based on user demand and user only pays for the resource usage. Data security plays a crucial role in cloud environment and user trust is most challenging problem of cloud services. This project proposed new methodology that secures data and provide privacy to the customer in cloud. Our technique providing security by using data partition approach and that partitioned data will be proceed further parallel for encryption mechanism. Here privacy is given by centric key management scheme.