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1、FIPSPUB46-3FEDERALINFORMATIONPROCESSINGSTANDARDSPUBLICATIONReaffirmed1999October25U.S.DEPARTMENTOFCOMMERCE/NationalInstituteofStandardsandTechnologyDATAENCRYPTIONSTANDARD(DES)CATEGORY:COMPUTERSECURITYSUBCATEGORY:CRYPTOGRAPHYU.S.DEPARTMENTOFCOMMERCE,W
2、illiamM.Daley,SecretaryNATIONALINSTITUTEOFSTANDARDSANDTECHNOLOGY,RaymondG.Kammer,DirectorForewordTheFederalInformationProcessingStandardsPublicationSeriesoftheNationalInstituteofStandardsandTechnology(NIST)istheofficialseriesofpublicationsrelatingtos
3、tandardsandguidelinesadoptedandpromulgatedundertheprovisionsofSection5131oftheInformationTechnologyManagementReformActof1996(PublicLaw104-106),andtheComputerSecurityActof1987(PublicLaw100-235).ThesemandateshavegiventheSecretaryofCommerceandNISTimport
4、antresponsibilitiesforimprovingtheutilizationandmanagementofcomputerandrelatedtelecommunicationssystemsintheFederalGovernment.TheNIST,throughitsInformationTechnologyLaboratory,providesleadership,technicalguidance,andcoordinationofGovernmenteffortsint
5、hedevelopmentofstandardsandguidelinesintheseareas.CommentsconcerningFederalInformationProcessingStandardsPublicationsarewelcomedandshouldbeaddressedtotheDirector,InformationTechnologyLaboratory,NationalInstituteofStandardsandTechnology,100BureauDr.St
6、op8900,Gaithersburg,MD20899-8900.WilliamMehuron,DirectorInformationTechnologyLaboratoryAbstractTheselectiveapplicationoftechnologicalandrelatedproceduralsafeguardsisanimportantresponsibilityofeveryFederalorganizationinprovidingadequatesecuritytoitsel
7、ectronicdatasystems.Thispublicationspecifiestwocryptographicalgorithms,theDataEncryptionStandard(DES)andtheTripleDataEncryptionAlgorithm(TDEA)whichmaybeusedbyFederalorganizationstoprotectsensitivedata.Protectionofdataduringtransmissionorwhileinstorag
8、emaybenecessarytomaintaintheconfidentialityandintegrityoftheinformationrepresentedbythedata.Thealgorithmsuniquelydefinethemathematicalstepsrequiredtotransformdataintoacryptographiccipherandalsototransformthecipherbacktotheoriginalform.TheDataEncrypti
