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1、OfThreatsandCosts:AGame-TheoreticApproachtoSecurityRiskManagementPatrickMaillé,PeterReichl,andBrunoTuffin1IntroductionTelecommunicationnetworksarebecomingubiquitousinoursociety,themostobviousexamplebeingthesuccessoftheInternet.Oneofthemainreasonsofthissuccessisscalability,whichmeansthatahugenetworkc
2、anbemanagedproperlyatnoÐornosigniÞcantÐadditionalcostcomparedtoasmallone.Thekeyissuehereisdecentralizationofdecisionsoverallnodesofthenetwork.Ontheotherhand,itisoftenassumedthatnodescooperatebyproperlyusingthedesignedprotocols,butplayingwiththeirparameterscouldimproveonenodeÕspositioninthenetwork,a
3、ttheexpenseoftheothers.Forthisreason,non-cooperativegametheoryhasrecentlycomeintoplayinthetelecommunicationcommunitytoanalyseselÞshbehaviourandtrytodesignmechanismswithappropriateincentives.ThischapterfocusesonaspeciÞcaspectoftelecommunicationnetworks:theirsecurity.Networksecuritymechanismsaimatpro
4、tectingagainstÒnaturalÓfailuresandvoluntaryattacks.Whiletheformerriskisrelatedtoreliabilityissuesandcanbeestimatedthroughanalyticorsimulationmethods,thelatterimpliesthattheactionsoftheattackerbeforeseenandcountered.Thechoiceofasecuritymechanismthere-foredependsonthedefenderÕsknowledgeofthepossiblea
5、ttacks.Ontheotherhand,anattackerwilltakeintoaccountthetargetÕsdefensestrategieswhendeterminingitsownattacktype.EachactorthereforeconsiderstheactionsoftheotherswhenPatrickMaillInstitutTelecom;TelecomBretagne,2ruedelaChtaigneraieCS17607,35576Cesson-SvignCedex,Francee-mail:patrick.maille@telecom-breta
6、gne.euPeterReichlTelecommunicationsResearchCenterVienna(ftw.),Donau-City-Str.1,1220Wien,Austriae-mail:reichl@ftw.atBrunoTufÞnINRIARennesÐBretagneAtlantique,CampusUniversitairedeBeaulieu,35042RennesCedex,Francee-mail:bruno.tufÞn@irisa.frN.Glpõnaretal.(eds.),PerformanceModelsandRiskManagement33inComm
7、unicationsSystems,SpringerOptimizationandItsApplications46,DOI10.1007/978-1-4419-0534-5_2,CSpringerScience+BusinessMedia,LLC201134P.Mailletal.strivingtooptimizeherownobjective.Suchinteractionsbetweenactors
