Cloud security refers to a broad set of policies, technologies, and controls deployed to protect data, applications, and the associated infrastructure of cloud computing. It is a sub-domain of computer security, network security, and, more broadly, information security. A number of security threats are associated with cloud data services: not only traditional security threats, such as network overhearing, illegal incursion, and denial of service attacks, but also specific cloud computing threats, such as side channel attacks, virtualization vulnerabilities, and abuse of cloud services Confidentiality, Access controllability, Data Integrity, Identity management, Privacy etc