International Journal of Computer Engineering & Applications
The cloud computing is a distributed computing model that was built to meet increasing demand for memory, storage and power due to industrialization and scientific research. In cloud environment, entire data resides over set of resources, which enables data to be accessed from Virtual Machines (VM). These datacenters might be placed at any place in the world which is beyond reach of users. Because of this many security challenges arise that should be considered. Availability of the cloud services is key security issues. Recently Distributed Denial of Service (DDoS) attacks are among one of the top threats to cloud environment and its being distributed in nature makes it simpler to launch.