Cryptography -- Nigel Smart

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1、Cryptography:AnIntroduction(3rdEdition)NigelSmartPrefaceToThirdEditionThethirdeditioncontainsanumberofnewchapters,andvariousmaterialhasbeenmovedaround.•ThechapteronStreamCiphershasbeensplitintotwo.Onechapternowdealswiththegeneralbackgroundandhistoricalmatters,t

2、hesecondchapterdealswithmodernconstructionsbasedonLFSR’s.ThereasonforthisistoaccomodateamajornewsectionontheLorenzcipherandhowitwasbroken.ThiscomplimentstheearliersectiononthebreakingoftheEnigmamachine.IhavealsoaddedabriefdiscussionoftheA5/1cipher,andaddedsomem

3、orediagramstothediscussiononmodernstreamciphers.•IhaveaddedCTRmodeintothediscussiononmodesofoperationforblockciphers.ThisisbecauseCTRmodeisbecomingmoreused,bothbyitselfandaspartofmorecomplexmodeswhichperformfullauthenticatedencryption.Thusitisimportantthatstude

4、ntsareexposedtothismode.•Ihavereorderedvariouschaptersandintroducedanewpartonprotocols,inwhichwecoversecretsharing,oblvioustransferandmulti-partycomputation.Thiscomplimentsthetopicsfromthepreviouseditionofcommitmentschemesandzero-knowledgeprotocols,whicharereta

5、inedamovedaroundabit.Thusthesecondedition’sPart3hasnowbeensplitintotwoparts,thematerialonzero-knowledgeproofshasnowbeenmovedtoPart5andthishasbeenextendedtoincludeothertopics,suchasoblivioustransferandsecuremulti-partycomputation.•Thenewchapteronsecretsharingcon

6、tainsacompletedescriptionofhowtorecombinesharesintheShamirsecret-sharingmethodinthepresenceofmaliciousadversaries.Toourknowledgethisisnotpresentedinanyotherelementarytextbook,althoughitdoesoccurinsomelecturenotesavailableontheinternet.WealsopresentanoverviewofS

7、houp’smethodforobtainingthresholdRSAsignatures.•Asmallsectiondetailingthelinkagebetweenzero-knowledgeandthecomplexityclassNPhasbeenadded.Thereasonforincludingextrasectionsetc,isthatweusethistextinourcoursesatBristol,andsowhenweupdateourlecturenotesIalsoupdateth

8、esenotes.Inadditionatvariouspointsstudentsdoprojectswithus,anumberofrecentprojectshavebeenonmulti-partycomputationandhencethesestudentshavefoundasetofnotesusefulinstartingth