Abstract: Cloud computing builds on established trends, where a large number of systems are connected in both public and private networks, which uses internet and one centralized server to maintain data and various applications. Due to Technology advancement, the cost of computation, application hosting, content storage and delivery is reduced significantly. Cloud Computing is a flexible, cost-effective, and proven delivery platform for providing business or consumer IT services over the Internet. Forrester defines cloud computing as: A pool of abstracted, highly scalable, and managed compute infrastructure capable of hosting end-customer applications and billed by consumption. This paper introduces a detailed analysis of the cloud computing security issues and challenges focusing on the cloud computing types and the service delivery types.

Keywords: Architecture; Infrastructure; Platform; Software; Security issues; Challenges; IT.