chapter 1 introduction to cryptology

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1、ModernCryptologyandEncryption-DecryptionTechnology高天寒Timothygao78@hotmail.comPositionandFunction•信息安全学科的重要基础•信息安全技术的核心手段•信息安全研究的热点方向•信息安全专业的必要技能高天寒Timothygao78@hotmail.comRelatedcourses•信息安全数学基础•计算机引论（C语言）•计算机网络•网络安全•通信概论•信息安全技术高天寒Timothygao78@hotmail.com课程资源•课件及相关资源Mail:cryptogra

2、phy_neu@yeah.netPwd:cryptography网易网盘我的文档2010•交流Mail:Timothygao78@hotmail.comBlog:http://blog.sina.com.cn/gaoth高天寒Timothygao78@hotmail.comQuiz•Doyouknowcryptology?•Doyouknowsomeciphers?•Doyouknowsomeapplicationsbasedoncryptology?•Doyouknowsomestoriesaboutcryptology?•Howdoyouknowt

3、hese?高天寒Timothygao78@hotmail.comCivilWar•MilitarycipherswereusedmoreextensivelyduringtheUSCivilWarthananyothertimeinthehistoryoftheworlduptothatpoint•TheNorthwasverysuccessfulinreadingSouthernmessages,inpartbecausetheSouthusedonlythreekeywordsduringthewarfortheirVigenereciphers¢MA

4、NCHESTERBLUFF¢COMPLETEVICTORY¢COMERETRIBUTION•TheNorthwasmoreskilledinbothsettingupandbreakingciphersanditclearlyhadanimpactontheoutcomeofthewar高天寒Timothygao78@hotmail.comWorldWarI（Zimmermann）•TheZimmermanntelegramwassentFromWashingtontoMexicotopreventUSattendingthewar•Thetelegram

5、wascapturedbyroom40andbrokensuccessfully•BritishsentthedecodedtelegramtoUS,butwasconcealedbygovernmentforitsbenefit•OnMarch1st,1917,Morningpaperscarrythestoryonpage1•April2nd:PresidentWilsongoestoCongresstoaskforwar.HecitestheZimmermanntelegram•Finally,USdeclaredwaronGermany,andch

6、angedhistory高天寒Timothygao78@hotmail.comWorldWarII（PearlHarbor）•UScreatedtheSignalIntelligenceServicein1930withWilliamFriedmanasitschief.TheNavycreatedOP-20-Gtoperformthesametasks•By1936,bothorganizationshadbrokensomeoftheJapanesecodesandweresendingtheplaintextontotheWarDepartment•

7、TheJapanesesenttheirmostsecretmessagesusingarotorciphersystemsimilartoENIGMAcalledPURPLE•Allbut2or3%ofthePURPLEkeyswererecoveredandmostmessagessolvedwithinhoursbytheUS•IntelligencehadinformedtheUSGovernmentofthreevitalfacts¢Japanesenavyinanunusualmovewastryingtohideitsposition¢Jap

8、aneseembassyinWashingtonwasordere