OLSR+: Improving OLSR Protocol against Sinkhole Attacks

• Main Authors: Chang, Hsin-Yu, 張心宇
• Other Authors: Huang, Yu-Lun
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/7k249f

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%.