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Acid attacks on pin-tumbler locks
Lars Oliver Meisel1, Matthias Weber2
1Bundeskriminalamt, KT 22-Formspuren, Wiesbaden, Germany.
Nitric acid can successfully bypass standard pin-tumbler locks, but this burglary method is slow and poses significant health risks. Researchers tested this novel attack, finding it effective in most cases.
Area of Science:
- Forensic Science
- Materials Science
Background:
- A novel home burglary technique using nitric acid to compromise tumbler locks has emerged in Europe.
- Understanding the efficacy and risks of this method is crucial for security assessments.
Purpose of the Study:
- To investigate the technical mechanism of nitric acid attacks on pin-tumbler locks.
- To evaluate the advantages and disadvantages of this specific burglary modus operandi.
Main Methods:
- Four standard pin-tumbler locks were subjected to 65% nitric acid injection via syringe.
- Locks were analyzed manually and with CT scanning to assess damage and functionality.
- The time required to overcome the locks was recorded.
Main Results:
- The nitric acid method successfully overcame the lock mechanism in three out of four tested cases.
- In one successful attempt, lock pins were removed and the core turned within 22 minutes.
- The acid demonstrably affected the internal lock components, including pins and springs.
Conclusions:
- The study confirms that nitric acid can be an effective tool for bypassing standard pin-tumbler locks.
- Significant drawbacks include the prolonged time required and substantial health hazards associated with handling nitric acid.
- This method's viability is limited compared to other lock-defeating techniques due to its practical challenges.
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