Master Key Systems & Key Control Flashcards

What does 'progressive keying' mean in the context of a master key system?

Answer: A hierarchy where each higher-level key operates all locks that subordinate keys operate

In progressive keying, a higher-level key such as a master key operates all locks accessible to the subordinate change keys within its group.

What is the purpose of a 'control key' in a removable interchangeable core lock system?

Answer: To physically remove and insert the lock core for fast re-keying

In interchangeable core (IC) systems such as BEST, the control key removes the lock core from its shell, enabling fast re-keying without disassembling the lock hardware.

What does 'key bitting' refer to in locksmithing?

Answer: The cuts or notches made into the key blade that determine which lock it operates

Key bitting refers to the specific pattern of cuts made into the key blade, and these cuts must align precisely with the lock's pin stack for the key to operate the lock.

In ALOA master key system notation, what does the abbreviation 'MK' designate?

Answer: The master key that operates all change key locks within its designated group

MK stands for Master Key in standard ALOA master key system notation, identifying the key that opens all change key locks within a defined group.

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

Answer: A comprehensive document listing all locks, bitting codes, and which keys operate each lock

A key schedule is a complete reference document mapping the entire master key system, showing each lock's bitting, its location, and every key authorized to operate it.

When a locksmith specifies locks are 'keyed to differ' (KD), what does this mean?

Answer: Each lock has a unique bitting so no two locks in the system share the same key

'Keyed to differ' means every lock in the system has a unique bitting, so no single change key can operate more than one lock, providing maximum security separation.

Which security principle is MOST critical when deciding who receives a master key?

Answer: Issuing master keys only to personnel who genuinely require broad access

Master keys provide access to all locks in a group and should be issued sparingly—each additional master key in circulation increases the security risk to the entire system.