Associated Locksmiths of America (ALOA) Practice Test

In the context of master key systems, CK stands for Change Key. A Change Key is a key that operates one or more specific locks in a master key system without the ability to operate the master key itself. This differentiation allows each user who has a Change Key to access their specific area or lock without having access to the entire master key system, which is typically managed by an authorized individual. Master key systems are designed to grant varying levels of access based on the type of key used, with the master key providing access to multiple locks, while the Change Key is limited to a particular lock or set of locks. This layered access enhances security by allowing more precise control over who can access different areas or compartments within a facility.