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时间:2018-01-21
《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》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
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
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