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dc.contributor.authorThomschutz, Hans Olaf Rutgeren_US
dc.date.accessioned2014-03-14T20:40:03Z
dc.date.available2014-03-14T20:40:03Z
dc.date.issued2005-05-25en_US
dc.identifier.otheretd-06152005-221301en_US
dc.identifier.urihttp://hdl.handle.net/10919/33591
dc.description.abstractSpurred by change in government regulations and to leverage lower-cost technology and services, many land mobile radio (LMR) operators have begun transitioning from circuit-switched to packet-switched backbone networks to handle their future communication needs. Due to the unique demands of packet-switched backbone networks for LMR, it may not be wise to carry over the previously implemented security methods used with circuit-switch systems or to treat an LMR backbone as a regular packet-switched network. This thesis investigates security in packet-switched LMR backbone networks to identify security issues in packet-switched LMR networks and provide possible solutions for them. Security solutions that are examined include different types of virtual private networks (VPNs), various encryption and keying procedures for safe communication, and logic behind how and where to implement security functions within the network. Specific schemes examined include IP Security (IPSec), OpenVPN, Virtual Tunnel (VTun), and Zebedee. I also present a quantitative analysis of the effects that the solutions have on packet-switched networks, in terms of link utilization, and on voice traffic, in terms of delay and delay jitter. In addition, I evaluate, in general terms, the additional cost or complexity that is introduced by the different security solutions. Simulation with OPNET Modeler was used to evaluate how the various security schemes affect voice communication and network performance as a whole. Since OPNET Modeler does not provide models of security functions, the source code of the transceiver system models was modified to introduce additional overhead that is representative of the various security solutions. Through experimentation, simulation, and analysis of the security schemes considered, it was found that the most effective security scheme overall for a packet-switched LMR backbone network would either be IPSec or OpenVPN implemented at the base stations and end-hosts. Both security schemes provide strong encryption, flexibility, and are actively supported. However, if bandwidth is scarce and flexibility is less important, then a security solution with less overhead, such as VTun, should be considered. Thus, one has to balance performance with security to choose the most effective security solution for a particular application.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartThomschutz_Thesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectVPNen_US
dc.subjectOPNET Modeleren_US
dc.subjectpacket-switcheden_US
dc.subjectcircuit-switcheden_US
dc.subjectvalidationen_US
dc.subjectfirst respondersen_US
dc.subjectpublic safetyen_US
dc.subjectsimulationen_US
dc.subjectProject 25en_US
dc.subjectP25en_US
dc.subjectAPCOen_US
dc.subjectRadio over IPen_US
dc.titleSecurity in Packet-Switched Land Mobile Radio Backbone Networksen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
dc.contributor.committeechairMidkiff, Scott F.en_US
dc.contributor.committeememberDaSilva, Luiz A.en_US
dc.contributor.committeememberAbbott, A. Lynnen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06152005-221301/en_US
dc.date.sdate2005-06-15en_US
dc.date.rdate2005-08-18
dc.date.adate2005-08-18en_US


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