Mohamed Tamer Refaei

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For ad hoc networks to realize their potential in commercial deployments, it is important that they incorporate adequate security measures. Selfish behavior of autonomous network nodes could greatly disrupt network operation. Such behavior should be discouraged, detected, and isolated. In this paper, we propose a reputation-based mechanism to detect and(More)
Ad hoc networks, such as sensor and mobile ad hoc networks, must overcome a myriad of security challenges to realize their potential in both civil and military applications. Typically, ad hoc networks are deployed in un-trusted environments. Consequently, authentication is a precursor to any secure interactions in these networks. Recently, numerous(More)
—Reputation management systems have been proposed as a cooperation enforcement solution in ad hoc networks. Typically, the functions of reputation management (evaluation, detection, and reaction) are carried out homogeneously across time and space. However, the dynamic nature of ad hoc networks causes node behavior to vary both spatially and temporally due(More)
Ad hoc networks employ a decentralized unstructured networking model that relies on node cooperation for key network functionalities such as routing and medium access. In this paper, we develop a model based on the Sequential Probability Ratio Test to characterize how nodes can differentiate between routes that include misbehaving nodes (infected routes)(More)
—We propose a secure routing architecture for Mobile Ad hoc NETworks (MANETs) called ThroughpUt-Feedback (TUF) routing, which is resilient against a wide range of routing disruption Denial-of-Service (DoS) attacks. Unlike many existing solutions, TUF does not focus on a particular type of attack, but instead takes an approach that is fundamentally more(More)
— CDMA 1x Ev-DO is an evolution of the CDMA2000 3G wireless standard to enable high rate packet data services up to 2.4Mbps in Rev 0, 3.1Mbps in Rev A, and 4.9Mbps in Rev B. To support such high data rates, CDMA 1x Ev-DO utilizes TDMA technology on the downlink allowing a single receiver per time slot. Accordingly, a scheduling algorithm is necessary to(More)
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