ALOA Master Key Systems and Keying

Question 1

In a master key system, what is the 'change key' (also called 'servant key')?

Accepted Answer

The lowest level key that opens only one specific lock in the system

Answer

A key that can open all locks in the system

Answer

A key used to change the combination of a lock

Answer

A key that opens locks in one department or group only

Question 2

What is a 'master key' in a keying hierarchy?

Accepted Answer

A key that operates all locks in a specific group or the entire system, in addition to its own change key level

Answer

A key reserved for emergency use only

Answer

A key that can change the bitting of any lock in the system

Answer

A key that bypasses electronic access control

Question 3

What are 'master wafers' (also called top master pins or master pins) in a pin tumbler master key system?

Accepted Answer

Additional small pins placed in chambers that allow the lock to be opened by both the change key and the master key

Answer

Pins that block the master key from working in certain locks

Answer

Special driver pins with a different shape for master key chambers

Answer

The top driver pins in a standard lock

Question 4

What is a 'grand master key' (GMK) in a master key hierarchy?

Accepted Answer

A key that operates all locks in the entire system, superseding all master keys and change keys

Answer

A key that opens all fire exits in a building

Answer

A key that operates only the highest-security locks

Answer

A key programmed to expire after a set number of uses

Question 5

What is 'key control' in the context of a master key system?

Accepted Answer

The policies and hardware (restricted keyways, key tracking records) that prevent unauthorized key duplication and track key issuance

Answer

The mechanical process of cutting keys to specific depths

Answer

The electronic system that tracks when keys are used

Answer

The protocol for storing keys in a secure key cabinet

Question 6

What is the 'maximum adjacent cut specification' (MACS) and why is it important in key cutting?

Accepted Answer

The maximum allowable difference in depth between adjacent cuts on a key, ensuring the key can be inserted without breaking the lock or key

Answer

The minimum number of cuts required on a master key

Answer

The maximum number of keys in a master key system

Answer

The deepest cut depth allowed by the manufacturer