Cloud computing and cloud security challenges

Cloud computing is setting off great changes in the IT industry. There are more and more researches on cloud computing. And this paper focuses on cloud computing too. At the beginning this paper describes the characteristics and definitions of cloud computing, and then introduced its services patterns (including SaaS, PaaS and IaaS) and deployment patterns(including public cloud, private cloud and hybrid cloud), at the end lists the cloud security challenges that cloud computing faces.