how to generate barcode in asp.net using c# Copyright 2005 by Bill Phillips. Click here for terms of use. in .NET framework

Encode Denso QR Bar Code in .NET framework Copyright 2005 by Bill Phillips. Click here for terms of use.

Copyright 2005 by Bill Phillips. Click here for terms of use.
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Top pins Bottom pins
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Cylinder housing
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Plug freely; that freedom of movement makes a lock pickable.
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Lower pin chambers
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Figure 14.1 In a pin tumbler cylinder there are many parts that all need to move
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Pin chamber holes aren t perfectly aligned, but there has to be enough room in each of the pin chamber holes for the pins to move in and out easily. Likewise, there has to be space between the plug and cylinder housing to allow the plug to be turned to the locked and unlocked positions. (When you re turning the lock with a key, you re turning the plug.) Figure 14.2 shows the plug in an unlocked position. This is when the bottom and top pins meet at the shear line. Lockpicking takes advantage of the necessary spaces and slight misalignments in a lock. In the locked position, one or more pins are lodged between the upper and lower pin chambers preventing the plug from turning. The right key has cuts that are positioned to move all the pins to the shear line at once, which frees the plug to be turned. The shear line is the space between the plug and cylinder housing. If all the pins are at the shear line, the plug is free to rotate (Fig. 14.3). The upper and lower pin chambers aren t drilled in a perfectly straight line across the plug and cylinder. If you look at them closely, you ll see more of a zigzag pattern. Figure 14.4 shows the lower pin chambers aligned along the cylinder plug. In all but the most expensive locks, there is a lot of play for the pins within the cylinder. This is because manufacturing processes aren t perfect. When you use a pick to lift a bottom pin, you re also lifting the corresponding top pin (or top pins in the case of a masterkeyed lock). As that pin stack is being lifted and you re applying varied pressure to your torque wrench (Fig. 14.5), the top of the bottom pin and the bottom of the top pin both reach the shear line at about the same time. The top pin goes into its upper pin chamber and leans against the chamber wall. The bottom pin, depending on its length, either stops at the shear line or falls back into the plug. At this point the torque wrench is able to turn the plug slightly. When it turns, a small ledge is created on the plug for the top pin to
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Lock Picking and Impressioning
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Upper pin chambers
Top pin
Shear line Lower pin chambers
Plug turning
Front view
Side view Cylinder in unlocked position
Figure 14.2 The right key lifts all the pin sets to the shear line, allowing the plug to turn.
Spring
Top Pin
Shear line Plug
Figure 14.3 When the bottom and top pins meet at the shear line, the plug can be turned.
sit on. This ledge prevents the top pin from falling back into the lower pin chamber when the pick is removed. The top pin will stay on the plug s ledge at the shear line as long as adequate pressure is being applied to the torque wrench. The shear line is the space between the upper and lower pin chambers. The object of lock picking is to have the top and bottom pins meet at the shear line so that none of the pins are obstructing the plug from turning. If you re picking the pins in the proper order, as each top pin is lifted and set on
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Figure 14.4 Top view of a plug showing lower pin tumbler chamber.
Lock pick Torque wrench
Figure 14.5 To pick a lock, lift one pin set at a time while applying torque or turning pressure with
a torque wrench.
the plug, the plug turns a little more, creating a bigger ledge. When all the top pins are on the ledge, all the bottom pins will be at or below the shear line, and the plug will be free to be rotated to the unlocked position by the torque wrench. Raking A common method of picking locks is the rake method, or raking. To rake a lock, insert a pick (usually a half-diamond or rake) into the keyway past the last set of pin tumblers, and then quickly move the pick in and out of the keyway in a figure eight movement while varying tension on the torque wrench. The scrubbing action of the pick causes the pins to jump up to (or above) the shear line, and the varying pressure on the torque wrench helps catch and
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