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lock bumping
Lock bumping is a lock picking technique for opening a pin tumbler lock using a specially crafted ''bump key'', ''rapping key'' or a ''999 key''. A bump key must correspond to the target lock in order to function correctly.
==History==
A US patent first appears in 1928 by H. R. Simpson called a rapping key.〔''High Security Mechanical Locks - An Encyclopaedic Reference'' published by Graham W. Pulford 2007, p. 19〕 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 the 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 & Rop Gonggrijp of The Open Organization Of Lockpickers (TOOOL) detailing the method and its applicability. A patent exists for a lock device following the same principle as the bump key from 1926–1928.
Marc Tobias, an American security expert, began to talk publicly in the United States about the technique and its potential security threats. In 2006, he released two further white papers regarding the technique and its potential legal ramifications.〔(The Lockdown: Locked, but not secure ) by Marc Weber Tobias. Retrieved February 12, 2007.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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