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

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

2、lphabetisapermutationorrearrangementofthe26letters.Inthefifteenthcentury,cryptographybecamemoresophisticatedandcryptographersproposedusingmultiplecipheralphabets,aprocessreferredtoaspolyalphabeticsubstitution.BlaisedeVigene`re’sbookATreatiseonSecretWriti

3、ngpublishedinthesixteenthcenturycontainsthebasicVigene`retableux,specifyingtheciphertextinpolyalphabeticsubstitution.Rotormachinesintroducedinthe20th-centuryprovidedmechanicalmeansforimplementingandspeedinguppolyalphabeticsubstitution.Thecoverisamodified

4、setof17cipheralphabets;theblackbackgroundcolorissymbolicoftheU.S.StateDepartment’sBlackChamberinwhichAmericancryptanalysisoriginatedintheearlypartofthe20th-century.Itistechnicallydefectiveinseveralaspects(i)fewerthan26lettersineachrowaredisplayedand(ii)

5、repeatedlettersoccurintherowscontainingthewordCRYPTOGRAPHYandmyname.Nevertheless,thecoverhopefullyprojectsthemessagetoreadComputerSecurityandCryptography.Copyright#2007byJohnWiley&Sons,Inc.AllrightsreservedPublishedbyJohnWiley&Sons,Inc.,Hoboken,NewJerse

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