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Distributed Access Control System (DACS) [1] is a light-weight single sign-on and attribute-based access control system for web servers and server-based software.DACS is primarily used with Apache web servers to provide enhanced access control for web pages, CGI programs and servlets, and other web-based assets, and to federate Apache servers.
Some key aspects of these systems include: Access credentials - Access cards, fobs, or badges are used to identify and authenticate authorized users. Information encoded on the credentials is read by card readers at entry points. Access control panels - These control the system, make access decisions, and are usually located in a secure area.
Operating systems security rests on achieving the CIA triad: confidentiality (unauthorized users cannot access data), integrity (unauthorized users cannot modify data), and availability (ensuring that the system remains available to authorized users, even in the event of a denial of service attack). [113]
Retrieved from "https://en.wikipedia.org/w/index.php?title=Access_control_system&oldid=55312291"
All SCI must be handled within formal access control systems established by the Director of National Intelligence. [1] SCI is not a classification; SCI clearance has sometimes been called "above Top Secret", [2] but information at any classification level may exist within an SCI control system. When "decompartmentalized", this information is ...
The definition of a closed loop control system according to the British Standards Institution is "a control system possessing monitoring feedback, the deviation signal formed as a result of this feedback being used to control the action of a final control element in such a way as to tend to reduce the deviation to zero."
The multiple access method may detect or avoid data packet collisions if a packet mode contention based channel access method is used, or reserve resources to establish a logical channel if a circuit-switched or channelization-based channel access method is used. The channel access control mechanism relies on a physical layer multiplex scheme.
A distributed control system (DCS) is a computerized control system for a process or plant usually with many control loops, in which autonomous controllers are distributed throughout the system, but there is no central operator supervisory control. This is in contrast to systems that use centralized controllers; either discrete controllers ...
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