![]() TOOOL and Dutch Consumentenbond, a Dutch consumer group, analyzed the technique on 70 different lock models with trained and untrained users in 2006. Bumping received further publicity from TOOOL presentations at security conferences. The technique attracted more attention in 2005 when a Dutch television show, Nova, broadcasted a story about bumping. After further research, 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. The use of a bump key was not recognized as a potential security issue until around 2002–2003 by Klaus Noch. 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. ![]() 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. Though the technique was known, it appears use was limited because it was considered a trade secret by many locksmiths. The first known mention of a "bump key" is in Hiram Simpson's 1926 patent "LOCK DEVICE".
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