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1、COMPUTERSECURITYANDCRYPTOGRAPHYALANG.KONHEIMCOMPUTERSECURITYANDCRYPTOGRAPHYCOMPUTERSECURITYANDCRYPTOGRAPHYALANG.KONHEIMAbouttheCover:Thetermcipheralphabetisusedwhenreferringtoamonoalphabeticsubstitution.WhentextiswrittenusingthelettersA,B,...,Z,acipheralphabetisapermutation
2、orrearrangementofthe26letters.Inthefifteenthcentury,cryptographybecamemoresophisticatedandcryptographersproposedusingmultiplecipheralphabets,aprocessreferredtoaspolyalphabeticsubstitution.BlaisedeVigene`re’sbookATreatiseonSecretWritingpublishedinthesixteenthcenturycontainsth
3、ebasicVigene`retableux,specifyingtheciphertextinpolyalphabeticsubstitution.Rotormachinesintroducedinthe20th-centuryprovidedmechanicalmeansforimplementingandspeedinguppolyalphabeticsubstitution.Thecoverisamodifiedsetof17cipheralphabets;theblackbackgroundcolorissymbolicoftheU.
4、S.StateDepartment’sBlackChamberinwhichAmericancryptanalysisoriginatedintheearlypartofthe20th-century.Itistechnicallydefectiveinseveralaspects(i)fewerthan26lettersineachrowaredisplayedand(ii)repeatedlettersoccurintherowscontainingthewordCRYPTOGRAPHYandmyname.Nevertheless,the
5、coverhopefullyprojectsthemessagetoreadComputerSecurityandCryptography.Copyright#2007byJohnWiley&Sons,Inc.AllrightsreservedPublishedbyJohnWiley&Sons,Inc.,Hoboken,NewJerseyPublishedsimultaneouslyinCanadaNopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmi
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