Abstract: Cloud computing is a way to share resources and services over internet. It is the set of services which are being provided to the customers over network on the pay per use basis. Services of the cloud computing are provided by third party provider. SaaS (Software as a Service), PaaS (Platform as a Service), IaaS (Infrastructure as a Service) are several services that are provided by service providers. There are many issues such as load balancing, VMM (Virtual Machine Migration), scheduling of requests. One of the major issues in cloud computing is “security”. This paper mainly focuses on the technical security issues associated with the usage of cloud services.

Keywords: Cloud Computing, Computing Computing Security, Security Threats, VMM.