[计算机安全和密码学].computer.security.and.cryptography[1]

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1、COMPUTERSECURITYANDCRYPTOGRAPHYALANG.KONHEIMCOMPUTERSECURITYANDCRYPTOGRAPHYCOMPUTERSECURITYANDCRYPTOGRAPHYALANG.KONHEIMAbouttheCover:Thetermcipheralphabetisusedwhenreferringtoamonoalphabeticsubstitution.WhentextiswrittenusingthelettersA,B,...,Z,acipheralphabetisapermutationorrearrangemento

2、fthe26letters.Inthefifteenthcentury,cryptographybecamemoresophisticatedandcryptographersproposedusingmultiplecipheralphabets,aprocessreferredtoaspolyalphabeticsubstitution.BlaisedeVigene`re’sbookATreatiseonSecretWritingpublishedinthesixteenthcenturycontainsthebasicVigene`retableux,specifyin

3、gtheciphertextinpolyalphabeticsubstitution.Rotormachinesintroducedinthe20th-centuryprovidedmechanicalmeansforimplementingandspeedinguppolyalphabeticsubstitution.Thecoverisamodifiedsetof17cipheralphabets;theblackbackgroundcolorissymbolicoftheU.S.StateDepartment’sBlackChamberinwhichAmericancr

4、yptanalysisoriginatedintheearlypartofthe20th-century.Itistechnicallydefectiveinseveralaspects(i)fewerthan26lettersineachrowaredisplayedand(ii)repeatedlettersoccurintherowscontainingthewordCRYPTOGRAPHYandmyname.Nevertheless,thecoverhopefullyprojectsthemessagetoreadComputerSecurityandCryptog

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