Charpter2-Cryptography

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1、Chapter2Cryptography高天寒Timothygao78@hotmail.comReviewWhatisinformationWhatisinformationsecurityThethreatsandattacksThegoalofinformationsecuritySecurityarchitectureEvaluationResearchcontents高天寒Timothygao78@hotmail.comContentsIntroductionClassicalciphersBlockciphersPubli

2、ckeyciphers高天寒Timothygao78@hotmail.comCivilWarMilitarycipherswereusedmoreextensivelyduringtheUSCivilWarthananyothertimeinthehistoryoftheworlduptothatpointTheNorthwasverysuccessfulinreadingSouthernmessages,inpartbecausetheSouthusedonlythreekeywordsduringthewarfortheirVigenerecip

3、hersMANCHESTERBLUFFCOMPLETEVICTORYCOMERETRIBUTIONTheNorthwasmoreskilledinbothsettingupandbreakingciphersanditclearlyhadanimpactontheoutcomeofthewar高天寒Timothygao78@hotmail.comWorldWarII（PearlHarbor）UScreatedtheSignalIntelligenceServicein1930withWilliamFriedmanasitschief.TheNa

4、vycreatedOP-20-GtoperformthesametasksBy1936,bothorganizationshadbrokensomeoftheJapanesecodesandweresendingtheplaintextontotheWarDepartmentTheJapanesesenttheirmostsecretmessagesusingarotorciphersystemsimilartoENIGMAcalledPURPLEAllbut2or3%ofthePURPLEkeyswererecoveredandmostmessa

5、gessolvedwithinhoursbytheUSIntelligencehadinformedtheUSGovernmentofthreevitalfactsJapanesenavyinanunusualmovewastryingtohideitspositionJapaneseembassyinWashingtonwasorderedtoburnallfilesJapaneseAmbassadorwasinstructedtodeliveramessagebreakingoffnegotiationsatexactly1p.m.onDec

6、7th，1941Whatdiditmeanandwhydidn’tUSreact?高天寒Timothygao78@hotmail.comThebasictechniqueNetworkattackdefenseAccesscontrolIntrusiondetectionAnti-virusPrivacypreservingTrustcomputingSecurityauditCryptographyMisusedetectionAuthenticationDigitalsignatureAnti-spammail高天寒Timothygao78@hot

7、mail.comCryptologyThebaseofinformationsecuritySubjectionofmathematicsCryptologyisthestudyofcodesandciphers——bibleofcryptologyCryptologyisprotection:carapacetoturtle,inktosquid,camouflagetochameleonCryptologyisthescienceofbuildingandanalyzingdifferentencryption-decryptionmeth

8、ods,includesEncryptionandDecryption高天寒Ti