求作业答案:阅读理解.阅读理解.PasswordsarenosafeguardsTypingyourpasswordorcreditcardnumberintoacomputerisamoment'swork.Butifyouthinkyourperso
求作业答案:阅读理解.
阅读理解. Passwordsarenosafeguards
Typingyourpasswordorcreditcardnumberintoacomputerisamoment'swork.Butifyouthinkyour
personaldetailsdisappearassoonasyouhittheReturnkey,thinkagain:theycansitonthecomputer'shard
diskforyearswaitingforahacker(黑客)totakethem.
Aspeoplespendmoretimeonthewebandhackersbecomemoreexperienced,thedangersofstoring
personalinformationoncomputersaregrowingbytheday,securityexpertssay.Therearesomesafe-guards,
suchasneverallowingyourcomputertostoreyourpasswords.Buteventhatinnoguaranteeofsecurity.
Whenyoutypeinapassword,itisstoredinrandomaccessmemory(RAM),whereitisheldtemporarily
untilotherdataoverwritesitorthecomputerisswitchedoff.
Buteverysooften,thecomputercopiesthecontentsofitsRAMontoharddisk,whereitiseasytoprey
(捕获)forahacker,whocanreaditdirectlyordesignawormtoe-mailitback.Thelongersensitivedata
staysinRAM,themorelikelyitistobecopiedontothedisk,whereitstaysuntilitisoverwritten-whichmight
nothappenforyears.
TalGarfinkelandcolleaguesfromStanfordUniversityhavecreatedasoftwaretoolwhichsimulates(模拟)
theworkingsofacompletecomputersystem.Withinthesimulation,sensitivedatacanbetaggedandthen
trackedasitpassesthroughthesystem.Next,Garfinkelandhisteamsimulatedcomputersrunningcommon
softwarethatregularlyhandlespasswordsorsecretpersonalinformation,suchasInternetExplorer,the
WindowsloginscriptandApacheserversoftware.
Inapapert