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1、上海交通大學(xué)碩士學(xué)位論文安全VoIP系統(tǒng)的研究與實(shí)現(xiàn)姓名：陳昌鵬申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：計(jì)算機(jī)應(yīng)用指導(dǎo)教師：白英彩20060101上海交通大學(xué)碩士學(xué)位論文ABSTRACTSTUDYINGANDIMPLEMENTINGSECUREVOIPSYSTEMABSTRACTVoiceoverIP(VoIP)isakeyenablingtechnologyforthesoft-switchednetworks.Longdistancecarriersaretransportingvoicetrafficusingthistechnology.Busin
2、essesandenterprisesofallshapesandsizesaredeployingVoIPintheirnetwork;VoIPservicesarealsobeingofferedtoresidentialcustomers.Asaresult,VoIPisrapidlybecomingtheprimaryunderlyingarchitectureforaverycriticalinfrastructurenamely,thetelecommunicationnetwork.SecurityissuesinVoIPar
3、edifferentandinwaysmorecomplexthansecurityfordataapplications.IPtelephonyisacomplexapplicationinvolvingmultiplelayersoftheprotocolstack,requiringinteroperabilityamongdifferentnewandlegacyprotocols,andinteractionsamongmultiplenetworkelements.Existingvulnerabilitiesincluding
4、eavesdropping,connectionhijacking,callfraud,anddenial-of-servicewilltakeonnewformsinaconvergednetwork.Moreover,VoIPnetworksarepronetovirusandwormspreadingthroughtheirdatanetworkelements.TherearekindsofintermediateserversintheVoIPsystem,suchaslogservers,authenticationserver
5、s,firewalls,andetc.Aterminaldoesnotalwaystrustallintermediariesinthenetworktoinspectitsmessages.Theterminalmightwanttoprotectthemessagefromalltheintermediaries,II上海交通大學(xué)碩士學(xué)位論文ABSTRACTexceptthoseprovideservicesbasedonitscontent.ThissituationrequiresanEnd-to-Middlesecuritymec
6、hanismtosecuretheinformationpassedbetweentheUAandintermediaries,whichdoesnotinterferewithend-to-endsecurity.Inthispaper,thefundamentalsecurityproblemswithVoIPsystemarediscussedandanalyzed,andtheresolutionsforthesesecurityissuesaregivenlayerbylayer.AmechanismtoprovideEnd-to
7、-Middlesecurityisproposed.AlsosomesuggestionsforVoIPdeployingaremade.KEYWORDS:VoIPSecurityS-VoIPIII上海交通大學(xué)碩士學(xué)位論文圖表目錄圖表目錄圖1軟交換分層結(jié)構(gòu)..............................................................................................6圖2SIP網(wǎng)絡(luò)結(jié)構(gòu).........................................
8、..........................................................8圖3SIP網(wǎng)絡(luò)通話(huà).....................
