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Non-Destructive Bypass Techniques

Bypass methods target the structural, mechanical, or sensory vulnerabilities surrounding a locking system without manipulating the lock cylinder itself.

1. Under-Door Tool (UDT) Attack​

  • Principle: Reaching beneath the door undercut to manipulate the interior egress handle or crash bar.
  • Target Hardware: Commercial Lever Handles on Outswing Doors.
  • Execution:
    1. Slide the semi-rigid wire base under the door threshold.
    2. Align the looped cable head over the interior lever handle using camera or mirror guidance.
    3. Pull the internal pull-string to tighten and depress the lever, withdrawing the latch bolt.

2. Latch Slipping (Shove Knife / Mica Slip)​

  • Principle: Depressing the spring latch directly through the door reveal gap.
  • Target Hardware: Outswing exterior doors or interior office doors where the latch bevel faces the operator.
  • Limitation: Ineffective if the auxiliary deadlocking pin is properly seated and depressed against the strike plate face.

3. Request to Exit (REX) Sensor Triggering​

  • Principle: Injecting a thermal or physical perturbation through door gaps into the field of view of interior Request to Exit (PIR) sensors.
  • Target Hardware: Magnetic Lock Access Systems.
  • Execution: Spraying inverted canned air (refrigerant mist) through meeting stiles or door seams to rapidly alter ambient infrared contrast.

Related Tools & Hardware​