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ID:33545943
大小:371.97 KB
页数:24页
时间:2019-02-27
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1、NetworkSecurity(网络安全原理与技术)Instructor:DiWu(吴迪)SunYat-SenUniversityIntroduction1QuestionComputerSecurityDifference?NetworkSecuritySunYat-SenUniversityIntroduction2AnswerComputerSecurityProtectdataitself.EspeciallyforasharedcomputersystemNetworkSecurityProtectda
2、tatransmissionSunYat-SenUniversityIntroduction3NetworksunderattackWhhatcanbbewrong?Howarecomputernetworksvulnerable?Whataresomeofthemoreprevalentattackstoday?Acknowledgement:PartoftheslidesareadoptedfromProf.KeithRoss’lecturenotes.SunYat-SenUniversityIntroduc
3、tion4ThebadguyscanputmalwareintoyourhostviatheInternetWeconnectourhhoststothheInternettogetgoodstuff:E-mail,webpages,mp3s,videoclips,searchresults,etc.Butalonggg,withthegoodstuff,comesthemalware:DeletefilesInstallspywarethatcollectsprivateinfoEnrollourcomprom
4、EnrollourcompromsedhostnabotnetisedhostinabotnetSunYat-SenUniversityIntroduction5Malware:self-reppglicatingOnceitinfectsonehost:seektksentryiitthntootherhhtostsandthenintoyetmorehostsVirus(病毒)Worms(蠕虫)Difference?Trojanhorse(木马)SunYat-SenUniversityIntroduction
5、6DifferenceVirusRequiressomeformofhumaninteractiontospreadClassicexample:E-mailvirusesWormsNouserreplicationneededWormininfectedhostscansIPaddressesandportnumbers,lookingforvulnerableprocessestoinfectTrojanhorseHidden,deviouspartofsomeotherwiseusefulsoftwareS
6、unYat-SenUniversityIntroduction7CaseStudyVirus:ILOVEYOU以电子邮件消息的形式发来,主题是ILOVEYOU,附件名为LOVE-LEEETTER-FOR-YOU.TXT.vbs向被感染者Outlook通讯簿名单发出自动信件,藉以连锁性的大规模散播,造成企业mailserver瘫痪Worm:CdRdCodeRed"HackdbChkedbyChinese!“Trojanhorse(木马):盗版软件可通过QQ/网游外挂传播SunYat-SenUniversityInt
7、roduction8Thebadguysattackservers&networkinfrastructure:DoSattacksDenialofService:Diminishesusabilityofnetworkhost,network,ornetworkinfrastructure.Vulnerabilityattack:Attackersendswell-craftedmessagestoavulnerableapporOScrashingmessagestoavulnerableapporOS,cr
8、ashingserviceorhost.Bandwidthflooding:AttackersendsadelugeofpackketstohthetargetedhdhTost.Target’’saccessliliknkbecomesclogged..Connectionflooding:Theattackerestablisheslargenumberofhalf-
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