摘要：A real IT revolution, cloud computing offers businesses the opportunity to save money and simplify their IT infrastructure, while increasing productivity. The migration to the cloud remains complex; we must choose an efficient and secure solution adapted to the business strategy. This paper gives and overview on Cloud Computing and its various compositions. The paper also describes the advantages and disadvantages of migration to cloud and discusses the security challenges and risks of Cloud. Finally, the paper presents solutions to reduce risks and How to reduce risks and to develop security in Cloud.
