Access Control Lists (ACLs)

 – A register of:   1. users (including groups, machines, processes) who have been   given permission to use a particular system resource, and   2. the types of access they have been permitted.   SOURCE: SP 800-12 Access Control Mechanism – Security safeguards (i.e., hardware and software features, physical   controls, operating procedures, management procedures, and various   combinations of these) designed to detect and deny unauthorized   access and permit authorized access to an information system.