Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Sybil attack"”.
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Phantom jam Sybil attack in connected vehicular networks
… Ad-hoc Networks (VANETs) are vulnerable to Sybil attacks, mostly due to the lack of encryption in BSMs. In VANETs, multiple digital certificates (pseudonyms) are assigned to each vehicle to ensure their privacy. However, malicious nodes can exploit these pseudonyms to create ghost vehicles, …
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Trustworthy and scalable anonymous communication
… points of trust, and (c) trust issues due to Sybil attack. In this thesis, we investigate the design of novel approaches to anonymous communication that are scalable, decentralized, and Sybil-resilient. First, we begin by investigating security vulnerabilites in existing P2P anonymity systems, …
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Trust management schemes for peer-to-peer networks
… the affects of malicious peers. However, a sybil attack, wherein forging identities is performed to unfairly and arbitrarily influence the reputation of peers in a network or community. To defend against sybil attack, each reported transaction, which is used to calculate trust values, is …
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Location based services in wireless ad hoc networks
… (performance) and iv) location clustering based Sybil attack detection in vehicular ad hoc networks (trust). The first contribution of this dissertation is in addressing location privacy in wireless sensor networks. We propose a non-cooperative sensor localization algorithm showing how an …
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Design and applications of a secure and decentralized Distributed Hash Table
… a given key. DHTs are subject to the well-known Sybil attack, in which an adversary creates many false identities in order to increase its influence and deny service to honest participants. Defending against this attack is challenging because (1) in an open network, creating many fake identities …
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Energy-efficient routing and secure communication in wireless sensor networks
… robust and secure against one or more malicious attacks. This thesis aims to provide an effective solution for minimizing the energy consumption of the nodes. The energy utilization is reduced by using efficient techniques for cluster head selection. To achieve this objective, two different …
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Key Management Scheme for Smart Grid
… In the recent past, there have been cyber-attacks on SGs causing substantial damage and loss of services. A recent cyber-attack on Ukraine's SG caused over 2.3 million homes to be without power for around six hours. Apart from the loss of services, some portions of the SG are yet to be …
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Detecting Rogue Nodes In Vehicular Ad-hoc Networks (DETER)
… this exchange of information is susceptible to attacks of different kinds. There are some very important issues that need to be resolved before VANETs can be deployed on large scale. Security and privacy issues are undoubtedly the most important factors that need to be resolved. Amongst various …
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A layered security approach for cooperation enforcement in MANETs
… more than one virtual identity to launch an attack, called a Sybil attack. In the context of reputation-based schemes, a Sybil attacker can disrupt the detection accuracy by defaming other good nodes, self-promoting itself or exchanging bogus positive recommendations about one of its …
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Data Collection, Dissemination, and Security in Vehicular Ad Hoc Network
… information dissemination in a VANET lies in Sybil attacks, where a single vehicle fakes multiple identities. We propose the Privacy-perserving Detection of Sybil Attack Protocl (P<super>2</super>DAP) scheme to detect such Sybil attacks. The P<super>2</super>DAP method does not require any …
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Analysis of bandwidth attacks in a bittorrent swarm
… with an experimental analysis of bandwidth attacks against different choking algorithms in the BitTorrent seed state. I reveal a simple exploit that allows malicious peers to receive a considerably higher download rate than contributing leechers, thereby causing a significant loss of …
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Spam Analysis and Detection for User Generated Content in Online Social Networks
… UGC system also makes it easy to be polluted andattacked by spammers and malicious users. How users participate in UGCnetworks, especially how users contribute content and share content with theirfriends and other users, is fundamental to spam detection and high qualityknowledge discovery. In …