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For example, the method it calls "scrubbing" is called "raking" by almost everyone else (it's not something I suggest you spend much time on, at least at first, by the way). While pin-at-a-time picking is usually the most reliable way to open a given lock (and the skills used essential for mastery of other techniques), raking can sometimes open a lock more quickly. There has been quite a bit written, on the Internet and in print, about lock picking. There are exceptions, however. In particular note that because the pins are slightly out of alignment, as the plug is turned gently, only the pin stack that is most out of alignment actually prevents further rotation. 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. The basic algorithm for picking locks is remarkably simple: - Apply a small amount of torque to 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.

Both the pick and the torque tool also amplify and transmit feedback about the state of the lock back to their user. 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. The rest is just technique -- locating and recognizing the state of each pin stack, manipulating the pins, applying torque to the plug. 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. See Figure 1. (In practice, the cuts are produced by stacking pin segments of particular lengths, not by actually cutting the pins; hence the term "pin stack.") With no key in the lock, all the pin stack cuts rest within the plug.

Around the circumference of the plug is a shell, which is fixed to the door or container. Note the border between the plug and shell, which forms the shear line, and the cuts in each pin stack resting within the plug. Picks probe and lift the individual pin tumblers through the keyway, while torque tools control the degree and force of plug rotation. If you tried to rotate the plug of such a lock without a key in the keyway, the top pin segment of each pin stack would block the plug at exactly the same number of degrees of rotation; each pin stack would contribute equally to preventing the plug from turning. Any physical security assessment should consider defenses against the full range of potential threats, not just vulnerability to lock picking. Many experienced locksmiths and expert lock pickers prefer "home made" tools to the commercial selections, especially for picking unusual and high security locks. While some of these features can be defeated with conventional picking tools and are covered here, picking high security locks generally requires specialized tools and techniques (often designed for a specific brand or model of lock) and are beyond our scope here. Unfortunately, these designs are less than ideal, and many of the "standard" picks are too large to fit and move comfortably in common lock keyways.

The tool must have a good fit to be effective, however. A detailed introduction to locks is well beyond the scope of this document; we assume here that you already understand, or have access to, the basic principles. Picking tools are designed to perform one of two basic functions: manipulating pins and turning the plug. Right: Side view, with part of the shell and plug cut away to expose the six pin stacks. Typical commercial and residential locks have five or six pin stacks (although four and seven aren't unheard of), with from four to ten distinct cut depths used on each. But the important thing, I repeat, about this kind of chant is that it’s quite different from the ordinary religious exercise that, say, we have in our churches, where we are interminably talking and thinking, and we never get to contemplation. Much of this is simply a matter of individual preference, but certain choices here can also have an impact on performance. If you can find a copy for sale, get it. To find places to buy BD, click here. Well, What is billiards here are a couple of rather lovely examples. And this is simply a symptom of the fact that we are confusing the description of the world on the one hand with the world itself on the other.