High Quality Content by WIKIPEDIA articles! Lock bumping is a lock picking technique for opening a pin tumbler lock using a specially-crafted bump key. One bump key will work for all locks of the same type.A US patent first appears in 1928 by H.R. Simpson called a 'rapping' or bump-key. In the 1970s, locksmiths in Denmark shared a technique for knocking on a lock cylinder while applying slight pressure to the back of the lock plug. When the pins would jump inside of the cylinder, the plug would be able to slide out freely, thus enabling the locksmith to disassemble the lock quickly. The use of a bump key was not introduced until some time later and was first recognized as a potential security problem around 2002–2003 by Klaus Noch who brought it to the attention of the German media. After further examination of the procedure, a white paper was drafted in 2005 by Barry Wels

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