In recent years, computing is being make over by a fresh representation, named as cloud computing, which refers to the hardware, software: both systems and application, that act as services over the Internet. Cloud computing is growing rapidly and gaining popularity because of reduced costs, quicker implementations, and enhanced flexibility. In this paper, a survey has been done on cloud computing with a major focus on its security issues. Concepts and challenges have been discussed which will give the researchers an idea about this latest emerging technology being tossed around in the world. This paper presents an overview of the cloud deployment models, the services they offer and cloud security issues and challenges of cloud computing in both data storage and virtual applications.
Cloud architecture, IaaS, Paas, Saas, cloud security.