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1、AbstractWiththedevelopmentofInternettechnologytheneedfornetworkprotocolidenti ficationisgrowing.Manyindustriesneedtoclassifythenetworktra伍caccordingtothetypeofprotocolthatuseruses.Ontheotherhand,theaccuracyoftheidentificationofnetworkprotocolisalsorelatedtothesecu
2、rityofthesystemnetwork.Traditionalsigna ture-basedprotocolidentificationmethodsidentifiedinthecourseoftheagreement,somemethodsonlyjudgewhetheracertainpacketinonenetworkconnectioncontainingaparticularsignatureornot,andsomeothermethodsmatchseveralpacketswhichhavebee
3、ncached・Theseidentificationmethodsind瓏rentoccasionshavedrawbacks-Themodelofprotocolidentification,whichcombinesfiniteautomataandsignature,canrecordthestatusoftheidentificationprocess-Thismethodofprotocolidentificationisusedtodescribesomestatesandtheirconversionrel
4、ationshipintheprocessofprotocolcommunication,byfinitestateautomaton,andregardsthesignatureofprotocolastheinputsymbolinthecurrentstateinfiniteautomaton,matchingthecapturedpackets.Somenetworkpacketsinaprotocol,whichcanoftenbeveryeasytoget,areverysmallamountofdatasig
5、natures.Butitisgenerallynotsufficienttodeterminetheprotocolbyasinglesmallfragmentsignaturebecauseofsmallamountofdata・Accordingtothemultiplicationprinc/le,asmallamountofdataonthesejointsignatureanalysis,cangreatlyinprovethecredibilitydeterminationofaprotocol.Howeve
6、r,theautomatonthatconstructedmayberedundantinstate.Inordertoreducetheredundantstates,analgorithmforoptimizationisproposed.Thecombinationoftheidentificationwithautomatonandsignatureandnetfilterframeworkachievesazero-copy,zero-cacheeflScientnetworktrafficmanagements
7、ystemTheidentificationofcombiningfiniteautomataandsignatureusesasmallamountofdatasignature,reducingthedifficultyinfilteringandchoosingsignatures,andyoucanzero-cachedmatchsignaturesonmorethanonenetwork.Itisveiyinportantfornetworksecuritywiththehelpofnetfilterframew
8、ork,providingahigh-speednetworklinkprotocolidentificationandlmnitoringenvironment.Keywords：finiteautomata,signature,protocolstate,connectionmultiplexing
