Locksmith Advanced Topics 5 — Questions and Answers
Question 1: What is 'bumping' in lockpicking, and what type of key is required?
- Drilling through the pin stacks using a vibrating tool
- Using a specially cut key and mallet strikes to momentarily separate pin stacks at the shear line (Correct answer)
- Applying high torque to snap the cylinder plug
- Vibrating the lock body to align wafer tumblers
Correct answer: Using a specially cut key and mallet strikes to momentarily separate pin stacks at the shear line
Lock bumping uses a key cut to the maximum depth at all positions; when struck, kinetic energy transfers through the bottom pins to momentarily jump the driver pins above the shear line.
Question 2: A locksmith is asked to master a BEST A2 interchangeable core system. What distinguishes interchangeable cores (IC) from standard cylinders?
- IC cylinders use wafer tumblers exclusively
- IC cylinders can be removed and installed without tools using a control key (Correct answer)
- IC cylinders are designed for padlocks only
- IC cylinders do not require a follow tool for rekeying
Correct answer: IC cylinders can be removed and installed without tools using a control key
Interchangeable cores are designed to be swapped in and out of compatible hardware without tools, using a specialized control key that allows rapid rekeying or core replacement.
Question 3: What is the significance of the 'MACS' (Maximum Adjacent Cut Specification) when designing keys?
- It defines the maximum number of cuts on a key
- It limits the allowable depth difference between adjacent cuts to ensure proper key function (Correct answer)
- It specifies the maximum key bow height
- It restricts the number of duplicate keys in a system
Correct answer: It limits the allowable depth difference between adjacent cuts to ensure proper key function
MACS prevents keys from having adjacent cuts with such extreme depth differences that the key's warding or the lock's driver pins are damaged during insertion or use.
Question 4: During a forensic locksmith investigation, what does the presence of 'bright metal' on pin tips inside a cylinder indicate?
- Normal wear from regular key use
- Evidence of picking or manipulation where picks abraded the pin surfaces (Correct answer)
- Manufacturer's quality plating
- Corrosion from humidity exposure
Correct answer: Evidence of picking or manipulation where picks abraded the pin surfaces
Bright, shiny marks on pin tips or plug chambers result from pick tools scraping against pins during a picking or raking attack, leaving forensic evidence of unauthorized entry.
Question 5: In a 'six-pin' pin tumbler lock, a locksmith finds one pin stack has a 'T-pin' (top hat pin). What is its purpose?
- It replaces the spring to reduce costs
- It creates a false set during picking, making the lock much harder to pick (Correct answer)
- It allows the master key to operate this specific pin position
- It increases the key cut depth range at that position
Correct answer: It creates a false set during picking, making the lock much harder to pick
T-pins (also called top-hat or spool pins) have a narrowed waist that creates a false shear line, causing the plug to rotate slightly during picking before setting correctly, alerting the picker.
Question 6: When cutting a transponder key for a vehicle using a code, a locksmith must also 'program' the key. What does this programming do?
- It physically cuts the electronic pattern into the key blade
- It writes the vehicle's unique immobilizer code to the transponder chip so the ECU recognizes the key (Correct answer)
- It resets the vehicle's odometer to sync with the new key
- It disables the original keys currently in service
Correct answer: It writes the vehicle's unique immobilizer code to the transponder chip so the ECU recognizes the key
Transponder programming writes or clones the specific cryptographic code the vehicle's immobilizer expects, allowing the engine to start when that key's signal is detected.
Question 7: What is the 'Bi-Lock' pin tumbler variant's main security feature that standard pin tumbler locks lack?
- It uses magnetic pins instead of metal pins
- It uses two parallel rows of pins that must both be raised to the correct height simultaneously (Correct answer)
- It requires a biometric scan before the key operates
- It uses rotating disc elements in addition to standard pins
Correct answer: It uses two parallel rows of pins that must both be raised to the correct height simultaneously
Bi-Lock cylinders have two opposing rows of pins on both the top and bottom of the plug, doubling the number of pin stacks and dramatically increasing pick resistance.
Locksmith Advanced Topics 5
What is 'bumping' in lockpicking, and what type of key is required?