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This work describes the access control system being implemented in INGRES (l__N_Nteractive Graphics and REtrieval S~stem). The scheme can be applied to any relational data base management system and has several advantages over other suggested schemes. These include: a) implementation ease b) small execution time overhead c) powerful and flexible controls d) conceptual simplicity The basic idea utilized is that a user interaction with the data base is modified to an alternate form which isdoi:10.1145/800182.810400 dblp:conf/acm/StonebrakerW74 fatcat:i6kmrxkckvax5gxhbbaamszucy