Keywords:Cloud issues, Virtual machine layer, Data issues, Security issues
Cloud computing is model which uses combine concept of “software-as-a-service” and “utility
computing”, provide convenient and on-demand services to requested end users. Security in Cloud computing is
an important and critical aspect, and has numerous issues and problem related to it. Cloud service provider and
the cloud service consumer should make sure that the cloud is safe enough from all the external threats so that the
customer does not face any problem such as loss of data or data theft. There is also a possibility where a malicious
user can penetrate the cloud by impersonating a legitimate user, thus infecting the entire cloud and affects many
customers who are sharing the infected cloud.