Abstract
The use of shim material is a common practice in the locksmithing trade. Thin sheet metal can slip into various thin crevices on a lock and used to force pins to behave in a specific manner (this is used sometimes during the act of field stripping a lock), or it can be used to trigger the release of a latch mechanism. The most common type of shim that can be seen in a covert entry toolkit is a butterfly shim. In addition, there are two related methods by which bumping can be performed, but vary enough in that separate diagrams are used to demonstrate them. The first technique examined is the “pull” method. This is widely believed to be the “original” style of bumping that was popular with locksmiths for decades, long before the amateur lockpicking world and the hacker community gained widespread knowledge of bumping.
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