Distributed Denial of Service (DDoS) attacks are becoming more frequent and the size of these attacks is increasing. This increases the load on the networks of Internet Service Providers (ISPs), while also taking websites offline. Nowadays, many companies rely on Internet applications (banking, communication) for their core business. As such, outages of Internet applications can have a big fina...

Distributed Denial of Service (DDoS) attack is a large-scale, coordinated attack on the availability of services of a victim system or network resource, launched indirectly through many compromised computers on the Internet. Researchers have come up with more and more specific solutions to the DDoS problem. However, existing DDoS attack tools keep being improved and new attack techniques are de...

Distributed denial of service (DDOS) attack constitutes one of the prominent cyber threats and among the hardest security problems in modern cyber world. This research work focuses on reviewing DDOS detection techniques and developing a numeric stable theoretical framework used for detecting various DDOS attacks in cloud. Main sections in the paper are devoted to review and analysis of algorith...

The Internet has experienced a tremendous expansion in its size and complexity since its commercialization. Internet hosts are threatened by large-scale Distributed Denial-ofService (DDoS) attacks in the network. DDoS attacks typically rely on compromising a large number of hosts to generate traffic to a single destination node. Thus the severity of DDoS attacks will likely increase to the poss...

Distributed Denial of Service (DDoS) attacks represent a major threat to uninterrupted and efficient Internet service. In this paper, we empirically evaluate several major information metrics, namely, Hartley entropy, Shannon entropy, Renyi’s entropy, generalized entropy, Kullback–Leibler divergence and generalized information distance measure in their ability to detect both low-rate and high-r...

Recently a number of highly publicized incidents of Distributed Denial of Service (DDoS) attacks against high-profile government and commercial websites have made people aware of the importance of providing data and services security to users. A DDoS attack is an availability attack, which is characterized by an explicit attempt from an attacker to prevent legitimate users of a service from usi...

While the increasing number of services available through computer networks is a source of great convenience for users, it raises several concerns, including the threat of hacking and the invasion of user privacy. Hackers can easily block network services by flooding traffic to servers or by breaking through network security, hence causing significant economic loss. It is well know that a Distr...

The damages from DDoS attacks are increasing as DDoS attacks are taking various forms. This has resulted not only in decreased reliability of organizations and corporations but also in the threat of national security. Organizations and corporations are making significant efforts in developing a system through which they can appropriately correspond to DDoS attacks. However, the studies on objec...

Web-sites acts as the best platforms for attacks like DDOS attack worm propagation and many other attacks which are related to application layer. To detect application layer DDOS attack is a cumbersome task. It is basically originated from the lower layer i.e. network layer and transport layer. Whereas this new application layer based DDOS attacks utilizes genuine HTTP request to make victim re...

Volumetric Distributed Denial of Service (DDoS) attacks have been a recurrent issue on the Internet. These attacks generate a flooding of fake network traffic to interfere with targeted servers or network links. Despite many efforts to detect and mitigate them, attackers have played a game always circumventing countermeasures. Today, there is an increase in the number of infected devices, even ...