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Cloud computing still suffer of many security issues that required the researchers to focus on it to make the users fully trust on it. In this paper we explain the security issues which attached to each service models Software as a service (SaaS), Platform as a service (PaaS) and Infrastructure as a service (IaaS). Furthermore, a comparative study has been presented for the three service models to evaluate their performance with rang of specific factors such as characteristics, Typical level of control granted to cloud consumer, provider and consumer activities.