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FED-STD-1026
August3. 1983
FEDERAL STANDARD
TELEcOMMUNICATIONS, lNTEROPERABILITYAND SECURITY
REQUIREMENTS FOR USE OF THE DATA ENCRYPTION STANDARD
INTHE PHYSICALLAYER OF DATA COMMUNICATIONS
Thisstandardisissuedby theGeneralServicesAdministrationpursuantto
theFederalPropertya“dAdministrativeServicesActof1949,asamended.
1.
%
1.1 ocscrintion.‘ThkstandardspecifitsInteropcrabilityandsecurity‘mlatcdrequirementsforusingencryptionatthe
%ysicalLayerofthe60 OpenSystemsMemonnection(0S0ReferenceModelintelecommunicationsystemsconveying
AutomaticOataprocessing(ADP)andlornarrativetextinformation.The algorithmusedfor●ncryptionistheOala
EncryptionSfawJard(OES),describedin FederalinformationProcessingStandar3s%bfication46. Requirements
cmwainedin thk standardrelateto tfw interoperationof hysicalLayerData EncrypticmEquipment,or their
inte~tion withassociatedDataTerminalEquipmentorDataCkult-rerminatfngEquipment.Additiomlsecurity
~WirCM@% notdirectIyrelatingtoinleroperabilify,arecontainedinFederalStandard1027.
I.2 C4fccfives
1.2.1
Meroperabifity.To facihtatetheinteropcrationof Governmentdatacommunicationfacilitiesandsystems
thatrequirecryptographicprotectionusingtheOataEncryptionStandad(DES)algorithm
1.2.2
=. TOp~~nt t~ di*J~Ureofplaintext
1.3
ADplication.ThLsstardardappliesto allDES cryptographiccomponents,equipment,systemsand services
procuredorleasedby Federaldepartmentsad agtnciesforencryptionofADP andlornarraivetextirdormafioninthe
physkaiLayer
of datacommunicationsusingtheOataEncryptionStanda!d(0SS)algorithm.Encryptionofvideosignals
andfacsimifedccumentsisnotwithinthescopeofthkstandard.Gddancetofaciiitatethe.PPficatiOnofthisStatiard.
withrespecttodegradationofsecuritybyimproperimplementationoruse,willk providedfo,.ina revi$io.toF~erai
propertyManagementRegulationbl CodeofFederalRegulations101-35.3.
1.4 Definitions.Thefollowingdefinitionscon.entiormandterminologyapplyinthtsstandatd.Furfherdefinitions
am cOn~&deral Standard1037.
a.
CiphettextiEncrypteddata.
b. Data EncrypticmEquipment(DEEh DES CryptograpMcEquipmentUS-4indatacommunicationsThis
equipmentmay beintegratedintoDataTerminalE@pme”t, DataCkcuit-terminating!@dpmmt, orbestand-alone.
c.
DES+ The Oafa EncryptionStandardalgorithmspecifiedin FederalInformatio”ProcessingStandards
~bfication46
d.
DES CryptographicEquipmentEquipmem ●mbodyingo“e,ormore DES devicesacd associatedcontrols+
interfaces,power suppfie%alarmsand ttw relatedhadware,software,and firmwareusedto encrypt,decrypt,
authenticate,andperformsimilaroperationsoninformation.
,.
OES Device:Theelectronichardwarepar!orsubassemblywhichimplementsjusttheDESalgorithm~ified
inFederalfnformationprocessingStandam3sFufdicatio.46,andwhichisvafidatdbytheNationalBureauofStandards.
f.
DES Key Variable.The 64bitsusedtokeyDES DataExrypticmEquipmem.Eighfbksareusedforparity
chcckhgand56tiltsareusedbyDESdevicesforencryptionanddecryption.
E.
S_dtfafizingVector(Iv):A vectorusedindefiningthestartingpointofanencryptionprccesswithina DES
device.
h
NarrativeTee Textforwhichthesemanticcontentis“otchangedby AutomaticDataProcessing(ADP)
e~ipme”t(e.g.,recordw narrativetraffic).
i.
Ffai”textUnencrypteddata.
i.
ServiceOata UnitiThe unitof dataprovidedas inputto a givenlayerof the tSO Open Systems
htercormectionReferenceModelfromthenexfhigherlayer.
2. ReferencedOocuments
a. FederaltnformationprocessingStandardsFwbficaficm$6:OataEncryptionStandaid.(Copiesofthisstandatdare
availablefromtheNatioralTechnicalhformationService,U.S.Departmentof Camme!ce,5285PoflRoyalRoad,
Springfield,VA 22161).
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