Today the scale, complexity and intensity of Denial of Service attacks has increased many folds. These attacks have moved from simple flooding based attacks to sophisticated Application based attacks as well as Protocol specific attacks.The challenge is to develop detection algorithms that can distinguish between the attacks like the new pulsating denial of service and legitimate traffic like F...

The shrew or RoS attacks are low-rate DDoS attacks that degrade the QoS to end systems slowly but not to deny the services completely. These attacks are more difficult to detect than the flooding type of DDoS attacks. In this paper, we explore the energy distributions of Internet traffic flows in frequency domain. Normal TCP traffic flows present some form of periodicity because of TCP protocol...

Distributed denial of service attacks are a major threat for wireless sensor network. The aim of these attacks is that genuine users can not use network such as bandwidth, computing power and operating system data structures. Jamming and flooding attacks are one of the most popular attacks on WSN which cause DDoS. There is a requirement for the detection of these attacks rapidly and perfectly. ...

The stealthy shrew Distributed Denial of Services (DDoS) attacks, also known as Reduction of Quality (RoQ) attacks, could be even more detrimental than the more widely known flooding DDoS assaults. The reason is that such shrew attacks damage the victim servers for a long time without being noticed, thereby denying new visitors to the victim servers, which are mostly e-commerce sites. Thus, in ...

-------------------------------------------------------------------ABSTRACT-------------------------------------------------------------In the mobile ad hoc networks the major role is played by the routing protocols in order to route the data from one mobile node to another mobile node. But in such mobile networks, routing protocols are vulnerable to various kinds of security attacks such as bl...

Mobile ad hoc networks will often be deployed in environments where the nodes of the networks are unattended and have little or no physical protection against tampering. The nodes of mobile ad hoc networks are thus susceptible to compromise. The networks are particularly vulnerable to denial of service (DOS) attacks launched through compromised nodes or intruders. In this paper, we present a ne...

In recent years, the use of mobile ad hoc networks (MANETs) has been widespread in many applications, including some mission critical applications, and as such security has become one of the major concerns in MANETs. A mobile ad hoc network is set up with a group of mobile wireless nodes without the use of any dedicated routers or base stations. Each node acts as an end node as well as a router...

Distributed Denial-of-Service (DDoS) flooding attacks are a serious threat to the security of the internet. A DDoS attack makes a machine or network resources not usable by the legitimate clients. A SYN flood is a form of denial-of-service attack. An attacker sends SYN requests continuously to a target system to consume enough server resources and to make the system unable to respond to legitim...

Distributed denial of service (DDoS) attacks pose great threat to the Internet and its public services. Various computation-based cryptographic puzzle schemes have been proposed to mitigate DDoS attacks when detection is hard or has low accuracy. Yet, existing puzzle schemes have shortcomings that limit their effectiveness in practice. First, the effectiveness of computation-based puzzles decre...