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Access Control Facility 2 (ACF2) is mainframe security software distributed by Computer Associates. It is used to protect a mainframe and its resources. The software prevents the deliberate or accidental modification, deletion, corruption, or viral infection of important files and data through extensive security measures like:
The system status is monitored continuously and completely, and any access attempt is logged so it helps to identify potential intruders, and allows for the identification and analysis of changes and trends in the use of the system.
Access Control Facility was originally developed by Barry Schrager, Scott Krueger and Eberhard Klemens in 1978 at London Life Insurance based in London, Ontario. The discretionary access control system was developed for the VSE, MVS, and VM operating systems. It was originally developed as a response to IBM’s RACF product developed in 1976 as an answer to the 1974 SHARE Security and Data Management project.
The North American marketing rights for the software were acquired by Cambridge Systems, who then added the "2" to the ACF name in order to differentiate it from the prototype and from the competition’s ACF/VTAM (IBM).ACF2 has five different operation modes: