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EBSCO Publishing : eBook Collection (EBSCOhost) - printed on 2/16/2016 3:46 AM via CGC-GROUP OF COLLEGES (GHARUAN) AN: 340572 ; Beyah, Raheem, Corbett, Cherita, McNair, Janise.; Security in Ad Hoc and Sensor Networks Account: ns224671
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Authentication and Confidentiality in Wireless Ad Hoc Networks 11 of v . The proposed mechanism works without requiring a centralized certi- fication authority or authentication server. However, the proposed system can be throttled by multiple colluding adversaries. Keoh et al. 13 have proposed similar credential verification scheme that establishes a web of trust between the nodes. However, the authors suggest the association of different trust levels for each credential verification by the nodes. Furthmore, partial attributes of the XML based Credential Assertion Statements can also be verified by the nodes. Interested readers are referred to the related publication for further details. 13 4.4. Certificate Revocation for Wireless Ad Hoc Networks Wireless ad hoc networks are prone to security attacks – where one or few participating nodes are compromised by external adversary to gain network access – due to the broadcast nature of their communication. Furthermore, the cooperative nature of these networks leads to several attacks launched by internal selfish nodes. These misbehaving nodes (compromised or selfish) need to be identified and evicted from the network to ensure secure and smooth operation. The authentication credentials of such nodes should be invalidated and all participating nodes should be informed about this inval- idation, ensuring the isolation of the misbehaving nodes from the network. In wired networks, Certificate Revocation Lists (CRL) are maintained at some centralized, publically accessable location. 23 This list comprises of the information about the revoked certificates. Network nodes can access the list from a centralized location. Alternatively, the list can be broadcasted at regular intervals to the participating nodes. In wireless ad hoc networks, the assumption of a centralized location is impractical and a single computationally limited node cannot be responsi- ble for maintaining and broadcasting CRL. Furthermore, keeping in view the dynamic nature of wireless ad hoc networks, identification of misbe- having nodes can be a challenging task. This is due to the lack of uniform traffic patterns where anomalies can be detected. Several techniques have been proposed in the literature for identification of misbehaving nodes. 2,24 However, misbehavior detection is not the focus of this chapter. We assume that one of these techniques 2,24 can be employed to detect the misbehav- ing nodes. The techniques discussed in the following paragraphs aim at isolating the misbehaving nodes from the network by invalidating their au- thentication credentials.
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