Solving traffic equilibrium problem, or “traffic assignment”, as the last step in Transportation Planning, distributes OD trip demands of a transportation network over the network links with regard to Traffic Equilibrium Law, and estimates the link flows. In formulations of traffic equilibrium which are based on path saving, the memory consumption is considerably affected by the number of effct...

Once an attacker has compromised a set of machines, typically, he will repeatedly deploy the same set of machines to attack different targets. In this paper, we propose a method to identify repeated attack scenarios, that is, the combination of a particular set of hosts and attack tool, by making use of pattern recognition techniques. While previous methods have focused on intrusion detection u...

In today’s era of hi-tech technologies, criminals are easily fulfilling their inhuman goals against the mankind. Thus, the security of civilians has significantly become important. In this regard, the law-enforcement agencies are aiming to prevent future attacks. To do so, the terrorist networks are being analyzed using data mining techniques. One such technique is Social network analysis which...

The wide deployment of 802.11 WLANs has led to the coexistence of wired and wireless clients in a network environment. This paper presents a robust technique to detect 802.11 wireless hosts through passive observation of client traffic streams at the edge of the network. It is based on the estimation of entropy of packet interarrival times and on the analysis of variation in the measured entrop...

One of the most important challenges for network administrators is the identification of applications behind the Internet traffic. This identification serves for many purposes as in network security, traffic engineering and monitoring. The classical methods based on standard port numbers or deep packet inspection are unfortunately becoming less and less efficient because of encryption and the u...

Measurement and analysis of traffic in IP networks are of great interest for network operators as they provide important information about the utilization of network resources, the user behavior, as well as the deployed applications and services. In particular, flow-level traffic measurements have become more and more ubiquitous in the past years. In this context, a flow is defined as a stream ...

The automated identification of network service dependencies remains a challenging problem in the administration of large distributed systems. Advances in developing solutions for this problem have immediate and tangible benefits to operators in the field. When the dependencies of the services in a network are better-understood, planning for and responding to system failures becomes more effici...

Denial-of-service attacks on the Internet today are often launched from zombies, multiple compromised machines controlled by an attacker. Attackers often take control of a number of zombies and then repeatedly use this army to attack a target several times, or to attack several targets. In this paper, we propose a method to identify repeated attack scenarios, that is, the combination of a parti...

The Tor network is probably one of the most popular online anonymity systems in the world. It has been built based on the volunteer relays from all around the world. It has a strong scientific basis which is structured very well to work in low latency mode that makes it suitable for tasks such as web browsing. Despite the advantages, the low latency also makes Tor insecure against timing and tr...