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Infoscience - École polytechnique fédérale de Lausanne
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35069 Publications
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  • A Test-Bed for Misbehavior Detection in Mobile Ad-hoc Networks --- How Much Can Watchdogs Really Do?

    Buchegger, Sonja; Tissières, Cédric; Le Boudec, Jean-Yves (2003)
    Several misbehavior detection and reputation systems have been proposed for mobile ad-hoc networks, relying on direct network observation mechanisms, so-called watchdogs. While these approaches have so far only been evaluated in simulations and restricted to selfish packet dropping, we are interested in the capabilities of a watchdog detection component in a real network. In this paper we present our test-bed implementation of misbehavior detection. Following an evaluation of both the feasib...

    Contention-aware metrics: analysis of distributed algorithms

    Urbán, Péter; Défago, Xavier; Schiper, André (2000)
    Contention-Aware Metrics: Analysis of Distributed Algorithms Resource contention is widely recognized as having a major impact on the performance of distributed algorithms. Nevertheless, the metrics that are commonly used to predict their performance take little or no account of contention. In this paper, we define two performance metrics for distributed algorithms that account for network contention as well as CPU contention. We then illustrate the use of these metrics by comparing four At...

    Matryoshka: Hiding Secret Communication in Plain Sight

    Safaka, Iris; Fragouli, Christina; Argyraki, Katerina (2016)
    We want to enable a pair of communicating users to exchange secret messages while hiding the fact that secret communication is taking place. We propose a linguistic steganography approach, where each human message is hidden in another human-like message. A hard open question is how to keep the steganographic message small -- existing related tools tend to blow up its size, thereby revealing the use of steganography. We encrypt by compressing each message, mapping it to a plausible sequence of...

    Générer de nouvelles polarités urbaines

    Rey, Emmanuel; Frei, Willi (2017)
    Les multiples impacts de l’étalement urbain ont conduit à la promotion d’une densification à l’intérieur d’aires déjà largement urbanisées. Dans ce contexte, les stratégies de développement territorial reposent notamment sur la création, respectivement sur le renforcement, de pôles denses, mixtes et interconnectés. La présentation de trois démarches dans lesquelles le bureau Bauart a été fortement impliqué permet de mettre en évidence quelques enjeux qualitatifs et opérationnels de ce type de...

    Expansion and densification of cities: linking urban form to ecology

    Scartezzini, Jean-Louis; Mohajeri, Nahid; Gudmundsson, Agust; Scartezzini, Jean-Louis (2015)
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