In this study different security and privacy related research
papers were studied briefly. Cloud services are used by both
larger and smaller scale organizations. Advantages of Cloud
computing are huge. But it‘s a global phenomenon that
everything in this world has advantages as well as
disadvantages. Cloud computing is suffering from severe
security threats from user point of view, one can say that lack
of security is the only worth mentioning disadvantage of
cloud computing. Both the Service providers and the clients
must work together to ensure safety and security of cloud and
data on clouds. Mutual understanding between service
providers and users is extremely necessary for providing
better cloud security. In this paper we have identified that
security is biggest hurdle in wide acceptance of cloud
computing. Users of cloud services are in fear of data loss
and privacy. Researchers and IT security professionals must
come forward and do more to ensure security and privacy to
users. Our study identifies top security concerns of cloud
computing, these concerns are Data loss, Leakage of Data,
Client‘s trust, User‘s Authentication, Malicious users
handling, Wrong usage of Cloud computing and its services