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Right: Side view, with part of the shell and plug cut away to expose the six pin stacks. When a key is inserted into the keyway slot at the front of the plug, the pin stacks are raised within the plug and shell. A functional pick kit should contain several different size hooks to accommodate a range of different keyway shapes. Any physical security assessment should consider defenses against the full range of potential threats, not just vulnerability to lock picking. Actually, the word "om" is spelled out in Sanskrit a-u-m, and thus comprises the whole range of sound from the back of the throat to the lips. It’s called mantra. This is a really untranslatable Sanskrit word which refers to the use of sound for its sound rather than its meaning, the use of certain syllables or phrases, on the principle of: one is cured by the hair of the dog that bit you. It’s because certain languages have the rule that all verbs have to have subjects. It’s not a gymnastic. The multiple peaks allow several, or even all, pin stacks to set simultaneously.

Other classes of attack, not discussed here but at least as worthy of study and scrutiny, include lock decoding, which is concerned with producing a working key based only on access to the external interface of the lock, lock bypass, which aims to unlatch the underlying locking mechanism without operating the lock at all, and forced entry, which, as the term suggests, involves the destructive application of force to the lock or its surroundings. The basic design consists of a rotatable cylinder tube, called the plug, linked to the underlying locking mechanism. Rotation of the plug within the shell operates the locking mechanism. In the locked state the plug is prevented from rotating by a set of movable pin stacks, typically under spring pressure, that protrude from holes in the top of the opening in the shell into corresponding holes drilled into the top of the plug. It's much easier to learn each skill in isolation, using locks specifically set up for the purpose. Longer handles are as a rule better in torque tools; the farther from the plug the torque can be applied, the easier it is to detect and control fine movement.

The plug can rotate freely only if the key lifts every pin stack's cut to align at the border between the plug and shell. In practice, of course, locks aren't perfect: the pin holes in the plug are slightly out of alignment with respect to the shell and the pins and pin holes are each of a slightly different diameter. See Figure 2. The plug will be blocked from rotating if any pin stack is lifted either not far enough (with the cut still in the plug below the shear line) or too far (with the cut pushed above the shear line and into the shell); to rotate, all pin stacks must have a cut at the shear line. Your goal is to learn to do this with the absolute minimum amount of torque needed to bind the most misaligned pin enough to distinguish it from the other one. Pin tumbler lock picking consists of raising the cuts on each pin stack to the shear line, one by one, until the plug turns freely. The modern pin tumbler lock is quite simple, dating back to ancient Egypt but not commercially mass-produced until the middle of the 19th century. Note that while many locks pick predominantly back to front or front to back, there are exceptions, and you may find that the binding pin stack "jumps around" from the back to the front to the middle and so on.

In the lab you'll find a collection of small (12 inch by 18 inch) lock boards, each containing six specially pinned locks with a given keyway. Schlage SC is a very common keyway. You may want to use one of the smaller torque tools as well, or put your torque tool in the bottom part of the keyway instead of the (curvy) top. The proper pick and torque tool selection depend on the shape of the keyway, the features of the lock, the picking technique, and the individual preferences of the user. Other names for the torque tool are turning tool, torque wrench, torsion wrench, and tension wrench. Picking tools are designed to perform one of two basic functions: manipulating pins and turning the plug. The principles and skills of lock picking, once mastered, can be applied against the vast majority of commercial pin tumbler locks, and the basic tools, if somewhat unusual, are quite simple. The basic algorithm for picking locks is remarkably simple: - Apply a small amount of torque to the plug. Probably the best book I've found on picking locks is the Gerry Finch Manual of Lock Picking, which unfortunately appears to be out of print as of this writing.

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