t-79.194 secure routing in wireless sensor networks attacks and countermeasures

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1、T-79.194'$SecureRoutinginWirelessSensorNetworks:AttacksandCountermeasuresC.KarlofandD.WagnerpresentationbyMaaritHietalahtiHelsinkiUniversityofTechnologyLaboratoryforTheoreticalComputerScienceMaarit.Hietalahti@hut.fiT-79.194SeminaronTheoreticalComputerScience.

2、27.4.2005&%1T-79.194'$¨¥Contents§¦•Introduction•Backgroundandrelatedwork•Problemstatement•Attacksonsensornetworksrouting•Attacksonspecificsensorprotocols•Example:DirectedDiffusion•Otherexamples•Countermeasures•Conclusion&%2T-79.194'$¨¥Introduction§¦•Sensornetw

3、orksareusuallynotdesignedwithsecurityinmind,yetsecurityisdifficulttoaddlateron•Ifadversariescandistruptorinterferewithrouting,sensornetworkbecomesgrippledoruseless•Resourcelimitationsareatwoorthreeordersofmagnitudeworsethaninadhocnetworks•=>Sensornetworksecuri

4、tyisadifficultchallenge&%3T-79.194'$¨¥BackgroundandRelatedwork§¦•Computationalpower:publickeycryptographyistooexpensive•Memory:Nodescannotmaintainmuchstate•Radiotransmissioncostly=>messageexpansioncostly•Moore'slawnotlikelytohelp:nodesarepreferredtogetcheaperi

5、nsteadofaddingperformance•Mostrelatedworkrequirescapabilitiesbeyondthoseofasensornetwork,exceptSPENandµTESLA[1]&%4T-79.194'$¨¥Problemstatement§¦Goal:“Everyeligiblereceivershouldreceiveallmessagesintendedforitandbeabletoverifytheintegrityofeverymessageaswellas

6、theidentityofthesender”1.Attackerscaneavesdrop,injectbits,replaypackets2.Attackerscanusemanycolludingnodesandnodescanbemorepowerfulthannormalsensornodes3.Ordinarynodesarenottamperresistant4.Basestationsareassumedtrustworthy,ordinarynodesandaggregationopintsar

7、enot5.Laptopattackersvs.moteclassattackers6.Insiderattacks:gracefuldegradation7.Secureroutingdoesnotincludeconfidentialityandprotectionagainstreplayattacks.&%5T-79.194'$¨¥Attacksonsensornetworksrouting§¦Spoofed,altered,orreplayedroutinginformationAnunprotected

8、sensorroutingisvulnerabletothesetypesofattacks,aseverynodeactsasarouter,andcanthereforedirectlyaffectroutinginformation.SelectiveforwardingAmaliciousnodecanselectivelydroponlycertainpacke