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AdHoc网络中的群组密钥协商协议研究的中期报告.docx

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AdHoc网络中的群组密钥协商协议研究的中期报告 Abstract: Adhocnetworkshavebeenwidelyusedinvariousfields,suchasmilitary,disasterrelief,andpublicsecurity,duetotheirflexibility,self-organizing,andself-configuringcharacteristics.Inthesescenarios,itisoftennecessarytoestablishsecurecommunicationbetweenagroupofnodeswithasharedkey.Groupkeyagreement(GKA)protocolsareusedtoachievethisgoalwithoutrelyingonpre-existinginfrastructureorcentralizedauthorities.Inthismidtermreport,wereviewthestate-of-the-artGKAprotocolsforadhocnetworks,classifythembasedontheirproperties,andcomparetheirperformanceintermsofsecurity,communicationandcomputationoverheads. Introduction: Adhocnetworksarewirelessnetworkswithoutafixedinfrastructure,nodescancommunicatewitheachotherdirectlyorindirectly.Adhocnetworksarebecomingincreasinglyimportantinvariousfields,suchasmilitary,disasterrelief,andpublicsecurity.Duetotheabsenceofpre-existinginfrastructureorcentralizedauthorities,securecommunicationbetweennodesinadhocnetworksischallenging.Groupkeyagreement(GKA)protocolsareusedtoestablishasharedkeyamongagroupofnodesforsecurecommunication.GKAprotocolsareclassifiedintotwocategories,centralisedanddecentralised.Centralisedprotocolsrequireatrustedcentralauthority,whiledecentralisedprotocolsdonotrelyonanysuchauthority.Inthismidtermreport,wemainlyfocusondecentralisedGKAprotocols. State-of-the-art: DecentralisedGKAprotocolsforadhocnetworkscanbefurtherclassifiedintothreecategories:identity-based,certificate-based,andthreshold-basedprotocols.Identity-basedprotocolsusenodes'identitiestoestablishasharedkey.Certificate-basedprotocolsrequirenodestoholdacertificateissuedbyatrustedauthoritytoprovetheiridentity.Threshold-basedprotocolsrequireasubsetofnodestojointlycomputeasharedkey.Alotofresearchhasbeendoneinthisarea,andsomeofthecommonlyusedprotocolsincludetheTGDH,FTE,andAKYprotocols. Comparison: DifferentGKAprotocolshavedifferentpropertiesandperformanceintermsofsecurity,communication,andcomputationoverhead.TGDHisacertificate-basedprotocolwithlowcommunica