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  2. Operating system - Wikipedia

    en.wikipedia.org/wiki/Operating_system

    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]

  3. Control system - Wikipedia

    en.wikipedia.org/wiki/Control_system

    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."

  4. Distributed control system - Wikipedia

    en.wikipedia.org/wiki/Distributed_control_system

    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 ...

  5. Basic access control - Wikipedia

    en.wikipedia.org/wiki/Basic_Access_Control

    Basic access control (BAC) is a mechanism specified to ensure only authorized parties [1] can wirelessly read personal information from passports with an RFID chip. It uses data such as the passport number, date of birth and expiration date to negotiate a session key.

  6. Discretionary access control - Wikipedia

    en.wikipedia.org/wiki/Discretionary_access_control

    In computer security, discretionary access control (DAC) is a type of access control defined by the Trusted Computer System Evaluation Criteria [1] (TCSEC) as a means of restricting access to objects based on the identity of subjects and/or groups to which they belong.

  7. File-system permissions - Wikipedia

    en.wikipedia.org/wiki/File-system_permissions

    Most file systems include attributes of files and directories that control the ability of users to read, change, navigate, and execute the contents of the file system. In some cases, menu options or functions may be made visible or hidden depending on a user's permission level; this kind of user interface is referred to as permission-driven.

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