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1、上海交通大学硕士学位论文安全VoIP系统的研究与实现姓名：陈昌鹏申请学位级别：硕士专业：计算机应用指导教师：白英彩20060101上海交通大学硕士学位论文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上海交通大学硕士学位论文ABSTRACTexceptthoseprovideservicesbasedonitscontent.ThissituationrequiresanEnd-to-Middlesecuritymec
6、hanismtosecuretheinformationpassedbetweentheUAandintermediaries,whichdoesnotinterferewithend-to-endsecurity.Inthispaper,thefundamentalsecurityproblemswithVoIPsystemarediscussedandanalyzed,andtheresolutionsforthesesecurityissuesaregivenlayerbylayer.AmechanismtoprovideEnd-to
7、-Middlesecurityisproposed.AlsosomesuggestionsforVoIPdeployingaremade.KEYWORDS:VoIPSecurityS-VoIPIII上海交通大学硕士学位论文图表目录图表目录图1软交换分层结构..............................................................................................6图2SIP网络结构.........................................
8、..........................................................8图3SIP网络通话.....................
