Bumping

Key Bumping

Key bumping is a covert entry technique used to quickly open pin-tumbler based locks. Key bumping is a method of using a modified a key that fits a target lock to create a kinetic energy transfer between top and bottom pins in the lock. Essentially, top pins are "bumped" above the shear line allowing the plug to turn. Key bumping is similar in function to a pick gun.

Bump Key Creation

...

Bumping vs. Pick Guns

In general, key bumping is considered more effective but less versatile than using a pick gun.

Pros:

• A bump key aligns in the keyway naturally. Pick guns may have difficulty being inserted due to warding or keyway shape.
• Bump keys can naturally include methods to bypass auxilliary locking mechanisms. <-- everest/evva reference? -->
• Keys are relatively inexpensive to obtain and modify compared to pick guns.

Cons:

• Finding a key for the lock may be difficult due to patent laws or distribution restrictions.
• Bumping causes pronounced deformation to the face of the lock. May be mitigated with various techniques discussed below.
• Bump keys are not universal due to keyway restrictions.

Bumping Defenses

Shadow Drilling

.

Top Gapping

.

Auxillary Locking Mechanism

.