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1、ABSTRACTWirelessLANhassomeadvantagesasfollows:itsagilityandconveniencetoorganizethenetwork,fasttoaccess,costslowonmaintenance.There'sahugemarketinfrontofitsapplicationbecauseofsuchadvantages.ButcompaniedwiththefastdevelopmentoftheWLANtechnology,people
2、becomemoreandmoreconcernedaboutitssecurityissue.So,attheyearof1997,theIEEEestablishedthe802.11standardforWLAN,andsuchstandardusesthemechanismofWEP(WiredEquivalentprivacy)，whichbasedonthealgorithmofRC4,toimproveitssecurity.However,severalkindsofsecurit
3、yleakshavebeendiscoveredintheWEPduringsomelaterworkofanalysisandresearch.Itjustfailedtoguaranteethedata'sconfidentialityandintegrity;neithercanitdotheidentityauthenticationtotheaccessedusers.Thispaperhasdoneresearchonthosetwoaspectsofthesafeleakagesan
4、ddigitalencryptiontechniquesofWEP,whichisbasedontheanalysisofsecuritymechanisminexistence.Firstly,itintroducesanauthenticationtechnologyofdigitalcertificatebasedontheauthenticatedstructureof802.1x.Thismethodcansolvetheproblemsofthehiddentroubleofsecre
5、tkeyshareandAP'sbidirectionalauthenticatedtrouble.Secondly,itintroducesAESalgorithmandusesitontheupdatingsecretkey,italsocansolveIV'sexcessivelyshortproblemeffectivelyandthetroubleofsecretkeyrepetition.So,theencryptedintensityhasbeenpromotedalot.Onthe
6、aspectofdigitalintegrityverify,itintroducestheMichaelalgorithm,solvingtheproblemthatinWEPmechanism,CRCcannotguaranteetheverityofinformationintegrity.Intheend,makingthesecrecytransferstodocumentsbecometrue.Inthispaper,theencryptedintensityanddigitalver
7、ifycapacityofsecrecytransferssystemhaspromotedalotcomparedtoWEP.ComparingtoTKIP,thespeedisfasterandalsotheagilityisbetter.TheAESsecretkeyupdatingmodulecanbeusedtomakeaDSPchipinsomeday,becausethe802.11TGiteamprescribedthattheproductsof802.11RSNcouldsup
8、portAESalgorithm.So,thecomputingspeedofdigitalencryptedmodulehasbeengreatlypromoted,andalsopromotedthedocumenttransferspeed.Keyword:WirelessLocalAreaNetwork,WEP,802.1x,TKIP,AES,AuthenticationII目录摘要..............................................
