468 research outputs found
Towards a network management solution for vehicular delay-tolerant networks
Vehicular networks appeared as a new communication solution where vehicles act as a communication infrastructure, providing data communications through vehicle-to-vehicle (V2V) or vehicle-to-infrastructure (V2I) communications. Vehicular Delay-Tolerant Networks (VDTNs) are a new disruptive network architecture assuming delay tolerant networking paradigm where there are no end-to-end connectivity. In this case the incial node transmits the data to a closed node, the data will be carried by vehicles, hop to hop until the destination.
This dissertation focuses on a proposal of a network management solution, based standard protocol Simple Network Management Protocol (SNMP) to VDTN networks. The developed solution allows control a VDTN netowork through a Network Management System (NMS) with the objective to detect and, if it’s possible, anticipate, possible errors on network.
The research methodology used was the prototyping. So, it was built a network management module to the laboratorial prototype, called VDTN@Lab. The system built include a MIB (Management Information Base) placed in all vehicular network nodes. The solution was built, demonstrated, validated and evaluated their performance, being ready for use.As redes veiculares foram desenhadas para permitir que os veículos possam
transportar dados criando assim um novo tipo de redes, caracterizando-se por dois tipos de
comunicação: comunicações veículo-para-veículo (V2V) ou comunicações veículo-parainfra-estrutura (V2I). Redes veiculares intermitentes (do Inglês Vehicular Delay-Tolerant
Networks - VDTNs) surgiram como uma nova arquitectura de rede de dados onde os
veículos são utilizados como infra-estruturas de comunicação. As VDTNs caracterizam-se
por serem redes veiculares baseadas no paradigma de comunicações intermitentes. Nas
redes VDTN não existe uma ligação permanente extremo a extremo entre o emissor e o
receptor. Neste caso, o nó inicial transmite os dados para um nó que esteja junto dele e
assim sucessivamente, os dados vão sendo transportados pelos veículos, salto a salto até
ao destinatário final.
Esta dissertação centra-se na proposta de uma solução de gestão de rede, baseada
no protocolo estandardizado Simple Network Management Protocol (SNMP) para redes
VDTN. A solução construída permite controlar uma rede VDTN através de um sistema de
gestão de rede (do Inglês Network Management System - NMS) com o objectivo de
detectar e, se possível antecipar, possíveis erros na rede.
A metodologia de investigação utilizada foi a prototipagem. Assim, foi construído
um módulo de gestão de redes para o protótipo laboratorial, chamado VDTN@Lab. O
sistema construído inclui uma MIB (Management Information Base) que é colocada em
todos os nós de uma rede veicular, tanto fixos como móveis. A solução foi construída,
demonstrada, validade e avaliado o seu desempenho, estando assim pronta para ser
utilizada
Securing routing protocols in mobile ad hoc networks
A Mobile Ad Hoc Network (MANET) is more prone to security threats than other
wired and wireless networks because of the distributed nature of the network.
Conventional MANET routing protocols assume that all nodes cooperate without
maliciously disrupting the operation of the protocol and do not provide defence
against attackers. Blackhole and flooding attacks have a dramatic negative impact
while grayhole and selfish attacks have a little negative impact on the performance
of MANET routing protocols.
Malicious nodes or misbehaviour actions detection in the network is an important
task to maintain the proper routing protocol operation. Current solutions
cannot guarantee the true classification of nodes because the cooperative nature
of the MANETs which leads to false exclusions of innocent nodes and/or good
classification of malicious nodes. The thesis introduces a new concept of Self-
Protocol Trustiness (SPT) to discover malicious nodes with a very high trustiness
ratio of a node classification. Designing and implementing new mechanisms that
can resist flooding and blackhole attacks which have high negative impacts on
the performance of these reactive protocols is the main objective of the thesis.
The design of these mechanisms is based on SPT concept to ensure the high
trustiness ratio of node classification. In addition, they neither incorporate the
use of cryptographic algorithms nor depend on routing packet formats which make
these solutions robust and reliable, and simplify their implementations in different
MANET reactive protocols.
Anti-Flooding (AF) mechanism is designed to resist flooding attacks which relies
on locally applied timers and thresholds to classify nodes as malicious. Although
AF mechanism succeeded in discovering malicious nodes within a small time, it
has a number of thresholds that enable attacker to subvert the algorithm and
cannot guarantee that the excluded nodes are genuine malicious nodes which was
the motivation to develop this algorithm. On the other hand, Flooding Attack
Resisting Mechanism (FARM) is designed to close the security gaps and overcome
the drawbacks of AF mechanism. It succeeded in detecting and excluding more
than 80% of flooding nodes within the simulation time with a very high trustiness
ratio.
Anti-Blackhole (AB) mechanism is designed to resist blackhole attacks and relies
on a single threshold. The algorithm guarantees 100% exclusion of blackhole nodes
and does not exclude any innocent node that may forward a reply packet. Although
AB mechanism succeeded in discovering malicious nodes within a small time, the
only suggested threshold enables an attacker to subvert the algorithm which was
the motivation to develop it. On the other hand, Blackhole Resisting Mechanism
(BRM) has the main advantages of AB mechanism while it is designed to close
the security gaps and overcome the drawbacks of AB mechanism. It succeeded in
detecting and excluding the vast majority of blackhole nodes within the simulation
time
ASMA: towards adaptive secured multipath in MANETs
As they are used to create open communities, Mobile Ad hoc NETworks (MANETs) are not favourable environments to establish trust, which is necessary to provide security. Multipath routing mechanisms within infrastructureless networks environment seems appropriate and useful to enhance security protection. In fact, the level of trust can be increased so as many of potential security attacks are detected, revealed and stopped.
Nevertheless an excessive control overhead is always generated. In this paper, we propose a global framework that integrates a set of concepts and mechanisms aiming at enhancing security in highly dynamic decentralized ad hoc networks. Our solution focuses on authentication, routing securing, trust management with reliable estimation of trust. A large panoply of attacks are prevented using our various mechanisms.8th IFIP/IEEE International conference on Mobile and Wireless CommunicationRed de Universidades con Carreras en Informática (RedUNCI
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