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Author: search.filters.author.Badache, NadjibSubject: search.filters.subject.Security

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    An Adaptive Anonymous Authentication for Cloud Environment
    (IEEE Xplore Digital labrary, 2015-06-02) Djellalbia, Amina; Benmeziane, Souad; Badache, Nadjib; Bensimessaoud, Sihem
    Preserving identity privacy is a significant challenge for the security in cloud services. Indeed, an important barrier to the adoption of cloud services is user fear of privacy loss in the cloud. One interesting issue from a privacy perspective is to hide user’s usage behavior or meta-information which includes access patterns and frequencies when accessing services. Users may not want the cloud provider to learn which resources they access and how often they use a service by making them anonymous. In this paper, we will propose an adaptive and flexible approach to protect the identity privacy through an anonymous authentication scheme.
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    Efficient Monitoring Mechanisms for Cooperative Storage in Mobile Ad-Hoc Networks : Detection Time and Accuracy Tradeoffs
    (CERIST, 2009-02) Derhab, Abdelouahid; Senouci, Mustapha Reda; Badache, Nadjib
    Distributed cooperative storage systems are designed to share the storage resources of network nodes for the common good of everyone, especially in dynamic ad hoc networks (MANETs) where the risk of data loss is high. In ad hoc networks, as mobile nodes operate on low-power battery and use limited storage capacity, data holders might behave selfishly by discarding some data they promised to store for other nodes in order to optimize their storage space for their own usage. To detect such a behavior, a monitoring mechanism, which checks whether a data is still held by the data holder, must be used. In this paper, we propose novel monitoring mechanisms that consider MANETs constraints and overcome the limitations of the existing monitors. Simulation results show that the proposed mechanism can o er a good trade-off between the rate of false positives and the time to detect misbehaved nodes.
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    On Eliminating Packet Droppers in MANET: A Modular Solution
    (Elsevier, 2009-08) Djenouri, Djamel; Badache, Nadjib
    In this paper we deal with misbehaving nodes in mobile ad hoc networks (MANETs) that drop packets supposed to be relayed, whose purpose may be either saving their resources or launching a DoS attack. We propose a new solution to monitor, detect, and safely isolate such misbehaving nodes, structured around five modules: (i) The monitor, responsible for controlling the forwarding of packets, (ii) the detector, which is in charge of detecting the misbehaving of monitored nodes, (iii) the isolator, basically responsible for isolating misbehaving nodes detected by the detector, (iv) the investigator, which investigates accusations before testifying when the node has not enough experience with the accused, and (v) finally the witness module that responds to witness requests of the isolator. These modules are based on new approaches, aiming at improving the efficiency in detecting and isolating misbehaving nodes with a minimum overhead. We describe these modules in details, and their interactions as well. We also mathematically analyze our solution and assess its performance by simulation, and compare it with the watchdog, which is a monitoring technique employed by almost all the current solutions.