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1、山東大學(xué)碩士學(xué)位論文摘要即時(shí)通信作為一種互聯(lián)網(wǎng)通信服務(wù),在個(gè)人和企業(yè)通信中都得到了廣泛的應(yīng)用,但是即時(shí)通信的安全問(wèn)題一直沒(méi)有得到足夠的重視。論文綜述了即時(shí)通信安全方面的研究文獻(xiàn),分析了當(dāng)前主流的即時(shí)通信系統(tǒng)在安全方面的缺陷和面臨的威脅,列出了即時(shí)通信系統(tǒng)需要實(shí)現(xiàn)的安全目標(biāo)。在此基礎(chǔ)上,論文提出了基于身份的即時(shí)通信加密協(xié)議(Identity.BasedInstantMessagingEncryptionProtocol,IBIMEP),并對(duì)協(xié)議的安全性和實(shí)現(xiàn)時(shí)相關(guān)的問(wèn)題進(jìn)行了分析?;谏矸莸拿艽a學(xué)(Identity-BasedCryptography,IBC)是--f-j較新的理論,相對(duì)傳統(tǒng)
2、的公鑰密碼體制具有很多優(yōu)勢(shì)。目前已經(jīng)有了基于IBC的安全電子郵件解決方案,但是總的來(lái)說(shuō)它的應(yīng)用還很少,還沒(méi)有論文詳細(xì)探討過(guò)如何將IBC應(yīng)用NllP時(shí)通信中來(lái)。本論文研究了即時(shí)通信系統(tǒng)的特點(diǎn),論證了IBC在即時(shí)通信中的適用性,并且為IBC應(yīng)用時(shí)面臨的關(guān)鍵問(wèn)題一身份認(rèn)證和私鑰分發(fā),提供了解決方案。.IBIMEP為即時(shí)通信系統(tǒng)提供的安全保護(hù)包括:用戶和服務(wù)器的雙向認(rèn)證,用戶和服務(wù)器之間的通信數(shù)據(jù)的安全性,用戶和用戶之間的通信數(shù)據(jù)的安全性,完善前向保密和可否認(rèn)性,以及抵抗重放攻擊的能力。IBIMEP是針對(duì)即時(shí)通信的安全而設(shè)計(jì)的,可以很方便的將它嵌入到主流的即時(shí)通信系統(tǒng)中,為系統(tǒng)提供安全保護(hù)。IBI
3、MEP不會(huì)給用戶增加任何負(fù)擔(dān),也不會(huì)影響用戶原本的使用習(xí)慣,它對(duì)用戶是完全透明的。關(guān)鍵詞:即時(shí)通信;基于身份密碼學(xué):網(wǎng)絡(luò)安全5山東大學(xué)碩士學(xué)位論文ABSTRACTAsallinstantwayofcommunicationsovertheinternet,InstantMessaging(IM)servicesareverypopularinpersonalandcorporatecommunications.However,thesecurityissuesofIMhavereceivedlittleconsiderationfromthesecurityresearchcommunit
4、y.Weprovideasurveyoninstantmessagingsecurity,discusssecuritydefectsandthreatstoexistingIMnetworksandlistthesecuritygoalsforinstantmessagingsystem.Inaddition,thethesispresentstheIdentity-BasedInstantMessagingEncryptionProtocol(IBIMEP)asasolutionforIMsecurity.Finally,thethesisprovidessecurityanalysi
5、sofIBIMEPanddiscussestheimplementationoflBIMEEIdentity-basedcryptography(IBC)isarelativelyyoungareaofcryptographyandhasmanyadvantagesovertraditionalpublic—keycryptosystems.NowIBChasnotbeenusedveryfrequentlyalthoughproductssuchassecureemailsystembasedonIBChasappeared.Inparticular,theapplicationofIB
6、CinIMappearslargelyunexplored.Thisthesissetsouttoexaminehowidentity-basedcryptographymightbeusedtosecureIMsystems.Wepresentdetailedschemesforidentityauthenticationandprivatekeydistribution,whicharetwomainproblemsinusingIBC.IBIMEPprovidesthefollowingsecuritypropoaiesforIMsystem:authenticationbetwee
7、naclientandtheIMserver;securecommunicationsbetweenaclientandtheIMserver;seourecommunicationsbetweentwoclients;perfectforwardsecrecyandrepudiability;resistanceagainstreplayattacks.IBIMEPisdesignedtoprovidesecurity