Provided by: IJESIT
Cloud computing is introducing many huge changes to people's lifestyle and working pattern recently for its multitudinous benefits. However, the security of cloud computing is always the focus of numerous potential cloud customers, and a big barrier for its widespread applications. In this paper, to facilitate people to understand the concept of cloud computing and contribute some efforts to pursue one of the major issues that is security of cloud computing, the authors surveyed the existing popular security models of cloud computing, e.g. multiple-tenancy model, risk accumulation model, cube model of cloud computing, and summarized the main threats of cloud computing.