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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.
A key exchange block may only hold and release keys and may not have a bolt to interlock process equipment, or may be part of the interlock of a particular machine or device. This is a transfer block, part of a trapped-key interlock system. It does not have a bolt to stop operation of a device, but holds and releases other keys.
The StarChase system, as of mid-2013 was in use by the Arizona Department of Public Safety, [5] Los Angeles Sheriff's Department, Austin Police Department, [6] and other agencies globally including the Ontario Provincial Police. [7] By early 2023, the company released a variation using a rifle platform called the 'Guardian-HX'.
A key retainer device (KRD) is a small metal unit that is wall or door mounted, usually designed for the interchangeable core that retains one key (Key A) while the second key (Key B) is used for authorized purposes. When the key in use (Key B) is returned into the key retainer, the key held captive (Key A) is turned and then can be released.
In the case of the hotel room lock, there is no central system; the keycard and the lock function in the same tradition as a standard key and lock. However, if the card readers communicate with a central system, it is the system that unlocks the door, not the card reader alone. [ 3 ]
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The system also allows a user to leave the ignition key in the vehicle, for later retrieval — including by another user sharing a unique entry code. Two hikers, for example, can leave the keys in the glove box, lock the door, and either hiker can return later to access the vehicle via their own code.
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