"Think outside the lock"
Over the years, locks have been constructed with many
specialized functions. Some have been designed to resist being blown open,
others to shoot or stab intruders or seize their hands. Locks have been made
that can be opened or closed by different keys but can be unlocked only by the
key that closed them.
So-called unpickable locks are usually devised to
prevent a thief from exploring the positions of the lock parts from the keyhole
or from sensing with his picking tool slight changes of resistance when pressure
is applied to the bolt. The basic types, however, remain the Bramah, lever,
Yale, and combination locks, though innumerable variations have been made,
sometimes combining features of each.
|The Swiss Kaba lock, for example, employs the Yale principle but its
key, instead of having a serrated edge, has flat sides marked with deep
depressions into which four complete sets of pin-tumblers are pressed.|
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Two out of three burglaries occur through a first floor door, yet the majority of
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Lock bumping or lock picking techniques are essentially the same.