计算机英文文献和翻译

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1、郑州大学毕业设计（外文文献翻译）计算机病毒郑州大学毕业设计——外文科技文献翻译题目：计算机病毒指导教师：李正民职称：副教授学生姓名：张永星学号：20052430239专业：计算机科学与技术院（系）：信息工程学院完成时间：2009年5月25日2009年05月25日14郑州大学毕业设计（外文文献翻译）计算机病毒COMPUTERVIRUSESWhatarecomputerviruses?AccordingtoFredCohen’swell-knowndefinition,acomputervirusisacomputerprogramthatcaninfectothercomputerprogra

2、msbymodifyingtheminsuchawayastoincludea(possiblyevolved)copyofitself.Notethataprogramdoesnothavetoperformoutrightdamage(suchasdeletingorcorruptingfiles)inordertobecalleda“virus”.However,Cohenusesthetermswithinhisdefinition(e.g.“program”and“modify”)abitdifferentlyfromthewaymostanti-virusresearchersu

3、sethem,andclassifiesasvirusessomethingswhichmostofuswouldnotconsiderviruses.Computervirusesarebitsofcodethatdamageoreraseinformation,files,orsoftwareprogramsinyourcomputer,muchlikevirusesthatinfecthumans,computervirusescanspread,andyourcomputercancatchaviruswhenyoudownloadaninfectedfilefromtheInter

4、netorcopyaninfectedfilefromadiskette.Oncethevirusesisembeddedintoyourcomputer’sfiles,itcanimmediatelystarttodamageordestroyinformation,oritcanwaitforaparticulardateoreventtotriggeritsactivity.Whatarethemaintypesofviruses?Generally,therearetwomainclassesofviruses.ThefirstclassconsistsofthefileInfect

5、orswhichattachthemselvestoordinaryprogramfiles.Theseusuallyinfectarbitrary.COMand/or.EXEprograms,thoughsomecaninfectanyprogramforwhichexecutionisrequested,suchas.SYS,.OVL,.PRG,&.MNUfiles.Fileinfectorscanbeeitherdirectactionorresident.Adirect-actionvirusselectsoneormoreotherprogramstoinfecteachother

6、timetheprogramwhichcontainsitisexecuted,andthereafterinfectsotherprogramswhen“they”areexecuted(asinthecaseoftheJerusalem)orwhencertainotherconditionsarefulfilled.TheViennaisanexampleofadirect-actionvirus.Mostothervirusesareresident.Thesecondclassissystemorboot-recordinfectors:thoseviruses,whichinfe

7、ctexecutablecode,foundincertainsystemareasonadiskthatarenotordinaryfiles.OnDOSsystems,thereareordinaryboot-sectorviruses,whichinfectonlytheDOSboot14郑州大学毕业设计（外文文献翻译）计算机病毒sectorondiskettes.ExamplesincludeBrai