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The performance of distributed networks depends on collaboration among distributed entities. To enhance security in distributed networks, such as ad hoc networks, it is important to evaluate the trustworthiness of participating entities since trust is the major driving force for collaboration. The trust based security protocol based on a cross-layer approach attains confidentiality and authentication of packets in both routing and link layers of MANETs but it doesn't address few attacks like bad mouthing attack, on-off attack, and conflicting behavior attack, sybil attack and newcomer attack. In this paper, the authors present DAS, a protocol for reducing of the corruptive/malicious influences of Sybil attacks.
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