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1、GROUPHIERARCHIESWITHDECENTRALIZEDUSERASSIGNMENTINWINDOWSNTRAVISANDHUandGAIL-JOONAHNGeorgeMasonUniversityAbstractitlydisplayedwiththeUserManagerprogram.Win-dowsNTnotablylacksafacilityforincludingonegroup1ThenotionofgroupsinWindowsNTismuchlikethatinanother.Inpractice,itisofte
2、ndesirablethatinotheroperatingsystems.Ratherthansetuserandgroupsbearsomerelationshiptoeachother.Byal- lerightsindividuallyforeachandeveryuser,thead-lowingmembershipinagrouptoautomaticallyim-ministratorcangiverightstovariousgroups,thenplaceplymembershipinsomeothergroupswecanr
3、educeuserswithinthosegroups.InthispaperwedescribeanthenumberofexplicitaccessdecisionsthatneedtobeexperimenttoextendtheWindowsNTgroupmecha-madebyusersandadministrators.Manycommercialnismintwosigni cantwaysthatareusefulinmanagingdatabasemanagementsystems,suchasInformix,Ora-gro
4、up-basedaccesscontrolinlarge-scalesystems.ThecleandSybase,providefacilitiesforhierarchicalgroupsgoalofourexperimentistodemonstratehowgrouphi-(orroles).Commercialoperatingsystems,however,erarchies(wheregroupsincludeothergroups)andde-providelimitedfacilitiesatbestforthispurpos
5、e.centralizeduser-groupassignment(whereadministra-AnotherlimitationofWindowsNTgroupsisthattorsareselectivelydelegatedauthoritytoassigncer-membershipisexclusivelycontrolledbybuilt-inadmin-tainuserstocertaingroups)canbeimplementedbyistratorgroupssuchasAccountOperators,Administ
6、ra-meansofMicrosoftremoteprocedurecall(RPC)pro-tors,andDomainAdmins[4].Thisisacentralizedgrams.Inbothrespectstheexperimentalgoalistomodelwhichdoesnotscalegracefullytosystemswithimplementpreviouslypublishedmodels(RBAC96forlargenumbersofgroupsandusers.Moregenerally,itgrouphier
7、archiesandURA97fordecentralizeduser-ispossibletodecentralizeuser-groupassignmentbyal-groupassignment).OurresultsindicatethatWindowslowingadministratorstoselectivelydelegateauthorityNThasadequate
exibilitytoaccommodatesophisti-toassigncertainuserstocertaingroups.catedaccessco
8、ntrolmodelstosomeextent.InthispaperwedescribeanexperimenttoextendtheWindows
