Amir Arabgari - Department of Computer Engineering, Khajeh Nasir Toosi University of Technology, Tehran, Iran
Abbas Ali Rezaee - Assistant Professor,Department of Computer Engineering and Information Technology, Payame Noor University, Tehran, IRAN

ABSTRACT In this paper, we will review the security considerations in cloud computing and the best security methods in cloud computing.Cloud security—also called cloud computing security—refers to the discipline and practice of protecting cloud computing environments, applications, data, and information. Cloud security entails securing cloud environments against unauthorized use/access, distributed denial of service (DDOS) attacks, hackers, malware, and other risks. While cloud security applies to security for cloud environments, the related term, cloud-based security, refers to the software as a service (SaaS) delivery model of security services, which are hosted in the cloud rather than deployed via on-premise hardware or software.

_Cloud Computing,Security,Data Security