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Podcasting has become a very popular and successful Internet service in a short time. This success illustrates the interest for participatory broadcasting, in its actual form however, podcasting is only available with fixed infrastructure support to retrieve publicized episodes. We aim at releasing this limitation and present herein our podcasting system(More)
Spatial Principal Component Analysis (PCA) has been proposed for network-wide anomaly detection. A recent work has shown that PCA is very sensitive to calibration settings, unfortunately, the authors did not provide further explanations for this observation. In this paper, we fill this gap and provide the reasoning behind the found discrepancies. First, we(More)
In opportunistic networks, end-to-end paths between two communicating nodes are rarely available. In such situations, the nodes might still copy and forward messages to nodes that are more likely to meet the destination. The question is which forwarding algorithm offers the best trade off between cost (number of message replicas) and rate of successful(More)
The security level of networks and systems is determined by the software vulnerabilities of its elements. Defending against large scale attacks requires a quantitative understanding of the vulnerability lifecycle. Specifically, one has to understand how exploitation and remediation of vulnerabilities, as well as the distribution of information thereof is(More)
Service discovery in mobile ad hoc networks is challenging because of the absence of any central intelligence in the network. Traditional solutions, as used in the Internet, are hence not well suited for mobile ad hoc networks. We present a novel decentralized service discovery mechanism for ad hoc networks. The basic idea is to distribute information about(More)
The research community worldwide has increasingly drawn its attention to the weaknesses of the current Internet. Many proposals are addressing the perceived problems, ranging from new enhanced protocols to fix specific problems up to the most radical proposal to redesign and deploy a fully new Internet. Most of the problems in the current Internet are(More)
Active queue management (AQM) is a family of packet dropping mechanisms for FIFO queues that have been proposed to support end-to-end congestion control mechanisms in the Internet. In this paper, we examine the four possible combinations of queue size averaging vs instantaneous queue size and a sharp dropping function vs a smooth dropping function. The(More)
Packet sampling methods such as Cisco's NetFlow are widely employed by large networks to reduce the amount of traffic data measured. A key problem with packet sampling is that it is inherently a lossy process, discarding (potentially useful) information. In this paper, we empirically evaluate the impact of sampling on anomaly detection metrics. Starting(More)