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A lock refers to a number of types of device for securing a door. While there are combination locks, smart card locks, and keyed locks, the mechanism known as a cipher lock is opened with a programmable keypad and - according to definition - is not a true lock. There is also a specific type of cipher lock called a Cypher Lock®, which was developed by Continental Instruments, now a division of Napco Security Group.

The U.S. Army distinguishes the use of cipher locks and keyed locks, stating that the purpose of keyed locks is to maintain physical security, while the purpose of cipher locks is to control access, limiting either unannounced intrusions or unescorted entry to particular areas of a facility that are sensitive. Cipher locks are used to control access to areas such as airport control towers, computer rooms, corporate offices, embassies, areas within financial institutions, research and development laboratories, and storage areas holding weapons, controlled substances, etc.

A cipher lock may have four or five pushbuttons, depending on the manufacturer. Even with five pushbuttons, the code may be one to five digits. When the cipher lock unit is set up the code is programmed and shared with authorized personnel. It can be changed at any time.

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Q: What is a Cipher lock?
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