Cloud computing is a new computing paradigm which allows sharing of resources on remote server such as hardware, network, storage using internet and provides the way through which application, computing power, computing infrastructure can be delivered to the user as a service. Cloud computing unique attribute promise cost effective Information Technology Solution (IT Solution) to the user. All computing needs are provided by the Cloud Service Provider (CSP) and they can be increased or decreased dynamically as required by the user. As data and Application are located at the server and may be beyond geographical boundary, this leads a number of concern from the user prospective. The objective of this paper is to explore the key issues of cloud computing which is delaying its adoption.
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