[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,acipheralphabetisapermutationorrearrangementofthe

2、26letters.Inthefifteenthcentury,cryptographybecamemoresophisticatedandcryptographersproposedusingmultiplecipheralphabets,aprocessreferredtoaspolyalphabeticsubstitution.BlaisedeVigene`re’sbookATreatiseonSecretWritingpublishedinthesixteenthcenturycontainsthebasicVigene`retableux,specifyingtheciph

3、ertextinpolyalphabeticsubstitution.Rotormachinesintroducedinthe20th-centuryprovidedmechanicalmeansforimplementingandspeedinguppolyalphabeticsubstitution.Thecoverisamodifiedsetof17cipheralphabets;theblackbackgroundcolorissymbolicoftheU.S.StateDepartment’sBlackChamberinwhichAmericancryptanalysiso

4、riginatedintheearlypartofthe20th-century.Itistechnicallydefectiveinseveralaspects(i)fewerthan26lettersineachrowaredisplayedand(ii)repeatedlettersoccurintherowscontainingthewordCRYPTOGRAPHYandmyname.Nevertheless,thecoverhopefullyprojectsthemessagetoreadComputerSecurityandCryptography.Copyright#

5、2007byJohnWiley&Sons,Inc.AllrightsreservedPublishedbyJohnWiley&Sons,Inc.,Hoboken,NewJerseyPublishedsimultaneouslyinCanadaNopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans,electronic,mechanical,photocopying,recording,scanning,orotherwise,exceptas

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