RACF demystified
This chapter explains how you can use the IBM Resource Access Control Facility (RACF®) to protect your network and communications. RACF uses the z/OS System Authorization Facility (SAF) to control access to resources such as data sets and IBM MVS™ commands. In a networking context, RACF resources can include networks and network services.
SAF is the high level MVS interface that allows you to plug in to any SAF-compatible security ...

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