International Journal of Science and Modern Engineering (IJISME)
In cloud environment, cloud servers providing requested cloud services, sometimes may crash after receiving huge amount of request. This situation is called denial of service attack. Cloud computing is one of today's most exciting technologies due to its ability to reduce costs associated with computing while increasing flexibility and scalability for computer processes. Cloud computing is changing the IT delivery model to provide on-demand self-service access to a shared pool of computing resources (physical and virtual) via broad network access to offer reduced costs, capacity utilization, higher efficiencies and mobility. Recently Distributed Denial of Service (DDoS) attacks on clouds has become one of the serious threats to this buzzing technology.