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.
This cipher lock is called a Three Digit Code Lock, which was
developed by Powerkeep corporation, for security purpose. Cipher
locks are available in a variety of metallic colors and can be
equipped with either a knob or a lever. The system is mechanical,
the master could set the secret code at anytime.
In addition to being used for doors and cabinets, password locks
have many interesting uses to protect anything belonging to you, as