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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
A dual control (dual custody) combination lock has two dials controlling two locking mechanisms for the door. They are usually configured so that both locks must be dialed open at the same time for the door to be unlocked. No single person is given both combinations, requiring two people to cooperate to open the door.
Common physical security access control with a finger print A sailor checks an identification card (ID) before allowing a vehicle to enter a military installation.. In physical security and information security, access control (AC) is the selective restriction of access to a place or other resource, while access management describes the process.
Some security portal mantraps use dual authentication, employing 2 separate readers (security card plus biometrics, for example). This is very typical in the data center security entrance control environment. Security portals with BR3 rated glass and steel construction for ballistics and burglary protection in a data center environment
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Role based access control interference is a relatively new issue in security applications, where multiple user accounts with dynamic access levels may lead to encryption key instability, allowing an outside user to exploit the weakness for unauthorized access.
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;