Cryptology and Physical Security: Rights Amplification in Master-Keyed Mechanical Locks
Matt Blaze · 2002
This paper describes new attacks for amplifying rights in mechanical pin tumbler locks. Given access to a single master-keyed lock and its associated change key, an procedure is given that allows discovery and creation of a working master key for the system. No special skill or equipment, beyond a small number of blank keys and a metal file, is required, and the attacker need engage in no suspicious behavior at the lock's location. Countermeasures are also described that may provide limited protection under certain circumstances.