Information Sharing in Mobile Ad-Hoc Networks: Evaluation of the MIDAS Data Space Prototype

Puzar, Matija; Skjelsvik, Katrine Stemland; Plagemann, Thomas; Munthe-Kaas, Ellen

doi:10.1109/icdcsw.2009.38

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…The implementation includes a fully functioning metadata managing system [9], data versioning system, subscription and notification mechanism, as well as eager and lazy synchronization [14]. Due to time constraints, however, only very simplified versions of some of the other sub-components are present in the implementation.…”

Section: Mds and The Traffic Controllermentioning

confidence: 99%

Evaluation of Replica Placement Strategies for a Shared Data Space in Mobile Ad-Hoc Networks

Puzar

Plagemann

2010

2010 13th International Conference on Network-Based Information Systems

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The dynamic nature of mobile ad-hoc networks (MANETs) can easily lead to data being inaccessible due to constant route changes and network partitions. One method often used for increasing reliability and availability of data is replication. However, replication comes with costs, those of transferring and storing data and keeping track of consistency between replicas. For that reason, we have identified the core factors impacting the resulting network traffic. We have performed experimental studies with a real world prototype of a distributed data management system for MANETs. Furthermore, we have done an extensive simulation study showing where table replicas should be placed in the network, in order to minimize network traffic generated by access to the databases and by the synchronization data. The results of the experiments are consistent and show that by using clustering techniques we can achieve close-to-optimal traffic by placing replicas on approximately 10 % of nodes.

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Section: Mds and The Traffic Controllermentioning

confidence: 99%

Evaluation of Replica Placement Strategies for a Shared Data Space in Mobile Ad-Hoc Networks

Puzar

Plagemann

2010

2010 13th International Conference on Network-Based Information Systems

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“…Title: Information Sharing in Mobile Ad-Hoc Networks: Evaluation of the MIDAS Data Space Prototype Authors: Matija Pužar, Katrine Stemland Skjelsvik, Thomas Plagemann, Ellen Munthe-Kaas Publication: The 2 nd International Workshop on Specialized Ad Hoc Networks and Systems (SAHNS 2009), Toronto, Canada, June 2009[44] …”

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confidence: 99%

Security and privacy issues in middleware for emergency and rescue applications

Puzar

Plagemann

Roudier

2008

2008 Second International Conference on Pervasive Computing Technologies for Healthcare

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Efficient information sharing among rescue personnel is crucial for a successful rescue operation. If computer networks were actively used by the rescue personnel, it would allow for more efficient communication, and information sharing in general, compared to standard walkie-talkies still in use today (often more than one at a time). However, emergency and rescue operations present the system with a number of characteristic requirements, compared to traditional networks. The most significant difference is that the network must be built up by the rescue personnel on the spot, and that the presence of existing infrastructure cannot be relied on. Moreover, the rescue personnel's movements make the network topology very dynamic and unstable. We call this type of networks mobile ad-hoc networks (MANETs). In this thesis, we analyze in detail the requirements for usage of MANETs in emergency and rescue operations, with particular focus on security and data sharing. Based on this analysis, the thesis suggests solutions to a selected set of major challenges. The thesis' main contributions are threefold. The first contribution is a concrete solution for one of the main security issues, namely ensuring that only authorized personnel has access to the network. This is achieved by means of a simple and efficient key exchange protocol that relies on device credentials being installed prior to the operation. Next, the thesis contributes with a shared data space that can be used to efficiently and robustly distribute information among the rescue personnel. The distributed nature of the data space is transparent to the applications, as well as the fact that data versioning is performed for the purposes of consistency, conflict resolution, and auditing. Data placement in such a distributed and dynamic environment has to be performed with outmost care. In the cases where network topology or the applications' access pattern to the data space are unknown upfront, we show that placing replicas on 10 % well chosen nodes, achieved e.g. by means of clustering techniques, leads to close-to-optimal placement with regards to network usage. The final contribution of this thesis is a network emulation test-bed implemented to facilitate development of specialized applications and protocols for MANETs. The test-bed has been utilized in a number of Master's and PhD theses, demonstrating its usefulness and flexibility with respect to development time and cost, as well as choice of programming languages. 1.3 Main Contributions The main contributions of this thesis can be summarized by the following four claims: Claim 1: In emergency and rescue operations, security has to be present at the lowest layers, in order to prevent malicious nodes from disrupting the network. The hierarchical organization of the entities involved in these kinds of operations can provide a basis for trust establishment between rescue personnel's devices. We provide a solution that exploits this fact in order to agree on a shared key. The solution can

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