New Directions in Cryptography.Diffie Hellman

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1、NewDirectionsinCryptographyInvitedPaperWhitfieldDiffieandMartinE.HellmanAbstractTwokindsofcontemporarydevelopmentsincryp-communicationsoveraninsecurechannelordertousecryptog-tographyareexamined.Wideningapplicationsofteleprocess-raphytoinsureprivacy,however,itcurrentlynecessaryfortheinghav

2、egivenrisetoaneedfornewtypesofcryptographiccommunicatingpartiestoshareakeywhichisknowntonosystems,whichminimizetheneedforsecurekeydistributiononeelse.Thisisdonebysendingthekeyinadvanceoversomechannelsandsupplytheequivalentofawrittensignature.Thissecurechannelsuchaprivatecourierorregistere

3、dmail.Apapersuggestswaystosolvethesecurrentlyopenproblems.privateconversationbetweentwopeoplewithnoprioracquain-Italsodiscusseshowthetheoriesofcommunicationandcompu-tanceisacommonoccurrenceinbusiness,however,anditistationarebeginningtoprovidethetoolstosolvecryptographicunrealistictoexpect

4、initialbusinesscontactstobepostponedproblemsoflongstanding.longenoughforkeystobetransmittedbysomephysicalmeans.Thecostanddelayimposedbythiskeydistributionproblemisamajorbarriertothetransferofbusinesscommunications1INTRODUCTIONtolargeteleprocessingnetworks.SectionIIIproposestwoapproachesto

5、transmittingkeyingWestandtodayonthebrinkofarevolutionincryptography.informationoverpublic(i.e.,insecure)channelwithoutcompro-Thedevelopmentofcheapdigitalhardwarehasfreeditfrommisingthesecurityofthesystem.Inpublickeycryptosystemthedesignlimitationsofmechanicalcomputingandbroughtenciphering

6、anddecipheringaregovernedbydistinctkeys,EthecostofhighgradecryptographicdevicesdowntowhereandD,suchthatcomputingDfromEiscomputationallyinfeasi-theycanbeusedinsuchcommercialapplicationsasremote100ble(e.g.,requiring10instructions).Theencipheringkeycashdispensersandcomputerterminals.Inturn,s

7、uchapplica-EcanthusbepubliclydisclosedwithoutcompromisingthetionscreateaneedfornewtypesofcryptographicsystemsdecipheringkeyD.Eachuserofthenetworkcan,therefore,whichminimizethenecessityofsecurekeydistributionchan-placehisencipheringkeyinapublicdirectory.Thisenablesne