S. Mahdi Shariati - Department of Electrical Engineering and Information Technology, Azad University of Tehran, Electronic Branch
a bouzarjomehri - Department of Electrical Engineering and Information Technology, Azad University of Tehran, Electronic Branch.
M. Hossein Ahmadzadegan - Department of Electrical Engineering and Information Technology, Azad University of Tehran, Electronic Branch.

Cloud computing is one of the most popular techniques in distributed computing which will increase scalability and flexibility in computer processing due to its ability to minimize the cost of time calculations. Cloud computing provides resources and shared services through the internet. Services will be delivered through the data center. Cloud computing provides an interesting business proposal for information technology industry, which without any additional investment, customers are able to do heavy processing by devices such as a mobile phone that has the resources including the web browser to run. On the other hand, cloud computing has been subject to many security issues. When a client delivers his data to a cloud provider for saving, there is the possibility of data loss. From the perspective of customers, cloud computing security concerns are still in place, in particular issues related to data security and privacy protection. In this paper, the challenges and security issues in cloud computing are investigated from two perspectives being data security and privacy protection

cloud computing, Saas, Paas, Iaas, different types of cloud, security risks, challenges, privacy protection, data security