2918.g密钥分散管理系统——密钥确认算法实现外文资料翻译--原文

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1、大学毕业设计(论文)外文资料翻译学院(系)：　计算机学院　　　　专　　业：　信息安全　学生姓名：　　　　班级学号：　　　　　外文出处：William Stallings.CryptographyandNetworkSecurity,FourthEdition.PrenticeHall.November16,2005附件：1.外文资料翻译译文；2.外文原文　指导教师评语：　　　　　　　　　　　　　　　　　　　　　　　指导教师签名：　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　年　　月　　日外文资料翻译——原文10.1.Ke

2、yManagementInChapter7,weexaminedtheproblemofthedistributionofsecretkeys.Oneofthemajorrolesofpublic-keyencryptionhasbeentoaddresstheproblemofkeydistribution.Thereareactuallytwodistinctaspectstotheuseofpublic-keycryptographyinthisregard:•Thedistributionofpublickeys•Theuseo

3、fpublic-keyencryptiontodistributesecretkeysWeexamineeachoftheseareasinturn.DistributionofPublicKeysSeveraltechniqueshavebeenproposedforthedistributionofpublickeys.Virtuallyalltheseproposalscanbegroupedintothefollowinggeneralschemes:•Publicannouncement•Publiclyavailabledi

4、rectory•Public-keyauthority•Public-keycertificatesPublicAnnouncementofPublicKeysOnthefaceofit,thepointofpublic-keyencryptionisthatthepublickeyispublic.Thus,ifthereissomebroadlyacceptedpublic-keyalgorithm,suchasRSA,anyparticipantcansendhisorherpublickeytoanyotherparticipa

5、ntorbroadcastthekeytothecommunityatlarge(Figure10.1).Forexample,becauseofthegrowingpopularityofPGP(prettygoodprivacy,discussedinChapter15),whichmakesuseofRSA,manyPGPusershaveadoptedthepracticeofappendingtheirpublickeytomessagesthattheysendtopublicforums,suchasUSENETnewsg

6、roupsandInternetmailinglists.Althoughthisapproachisconvenient,ithasamajorweakness.Anyonecanforgesuchapublicannouncement.Thatis,someusercouldpretendtobeuserAandsendapublickeytoanotherparticipantorbroadcastsuchapublickey.UntilsuchtimeasuserAdiscoverstheforgeryandalertsothe

7、rparticipants,theforgerisabletoreadallencryptedmessagesintendedforAandcanusetheforgedkeysforauthentication(seeFigure9.3).PubliclyAvailableDirectoryAgreaterdegreeofsecuritycanbeachievedbymaintainingapubliclyavailabledynamicdirectoryofpublickeys.Maintenanceanddistributiono

8、fthepublicdirectorywouldhavetobetheresponsibilityofsometrustedentityororganization(Figure10.2).Suchasch