| Summary: | 碩士 === 國立交通大學 === 電機工程學系 === 106 === A military field is infrastructure-less and its network topology is changing. A mobile ad
hocnetwork(MANET)isformed. Soldiersneedtocommunicatewitheachotherandforward
messages promptly. Therefore, a proactive routing protocol is required to maintain the routes.
Nonetheless,attackersmayexistinamilitaryMANETandlaunchroutingattacks. Hence,ase
cureroutingprotocolisrequired. Ingeneral,OLSRisaproactiveroutingprotocolinMANET
withbetterperformance. InOLSR,amultipointrelay(MPR)isdesignedtodiscoveranetwork
topology. However,OLSRisinsecure. Onceamaliciousnodeisselectedasamultipointrelay,
themaliciousnodemaycausefalsetopologyandincorrectroutingtable. Inthisthesis,wepro
poseasecureroutingprotocol,OLSR+,tofindatrustedrouteforforwardingpackets. OLSR+is
designedformilitaryfieldsbasedontrustinessandcreditstoprotectnodesinMANETsagainst
sinkholeattacks. AlltheoperationsinOLSR+arebasedontrustinessandcredit,suchasMPR
selection,routingtablecalculationanddatarouting. OLSR+usesthefeedbackfromneighbor
ing nodes to determine the trustiness of each node. We design a PI weight to collect trustiness
fromneighboringnodesandderivecreditofeachnodeaccordingly. OLSR+basesonthecredit
ofnodestoselectmultipointrelaysandcalculateroutingtablestoguaranteecorrecttopologyin
formationandmakesdataroutingsecure. WeconductseveralexperimentstoverifyourOLSR+.
Whenthenumberofmaliciousnodesincreases,thepacketdeliveryratiosofOLSR+canremain
above90%andMPRcorrectratescanremainabove80%. Also,theroutingtablecoveragesin
OLSR+canremainatnearly100%.
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