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The simplest form of dual key security is a lock that requires two keys to open, with each key held by a different person. The lock can only be opened if both parties agree to do so at the same time. In 1963, Canada accepted having American W-40 nuclear warheads under dual key control on Canadian soil, to be used on the Canadian BOMARC missiles.
Dual control theory is a branch of control theory that deals with the control of systems whose characteristics are initially unknown. [1] [2] It is called dual because in controlling such a system the controller's objectives are twofold: (1) Action: To control the system as well as possible based on current system knowledge
Maker-checker (or Maker and Checker or 4-Eyes) is one of the central principles of authorization in the information systems of financial organizations. The principle of maker and checker means that for each transaction, there must be at least two individuals necessary for its completion.
Alexander Aronovich Feldbaum (1913 — 1969) was a Soviet scientist in the field of automatic control and fundamental computer science. He is one of the founders of optimal control, and proposed dual control theory in the study of self-adjusting and self-learning systems.
A dual signaling communication device is attached to a control panel on a security installation and is the component that transmits the alarm to the ARC. It can do this in a number of different ways, via the GPRS radio path, via the GSM radio path or via the telephone line/or IP.
Some control rooms are themselves under continuous video surveillance and recording, for security and personnel accountability purposes. Many control rooms are occupied on a " 24/7/365 " basis, and may have multiple people on duty at all times (such as implementation of a " two-man rule "), to ensure continuous vigilance.
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Security controls can also be classified according to the implementation of the control (sometimes termed control categories), for example: Physical controls - e.g. fences, doors, locks and fire extinguishers;
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