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What is the principle of a password lock?
Aug 11, 2018

What is the principle of a password lock?

Most cryptographic locks use wheel groups, that is, a group of wheels that work together to know the password. Below will give you a brief introduction of the principle of password lock.


The general password lock has a password dial connected to the spindle. Inside the lock, the mandrel connects several wheels and a driving cam.


The number of wheels in the wheel set is determined by the number of bits, that is, a runner represents a number. When you rotate the dial, the mandrel turns the driving cam. The drive cam is connected with the drive pin. With the rotation of the cam, the transmission pin finally touches the small pulling piece on the adjacent runner, that is, the transmission plate.


There is a transmission piece on both sides of the wheel. The drive pin rotates the first runner until it touches the adjacent runner. This process continues until all the wheels are rotated. This is the so-called rotating wheel. Each wheel on the axis is engraved with a concave mouth. When you dial the correct password, all the wheels and their notches will be aligned.


A rod is a small metal bar connected to a lever. The guard bar prevents the opening of the safe door when the password is not unlocked. For this reason, the retaining rod is leaned on the runner to block the movement of the bolt of the safe door.


When all wheels are aligned, their notches will be aligned to form gaps. On the padlock, this gap can loosen the lock buckle. On the safety box, there is a component called a stop bar that is attached to all the wheels. The retaining rod falls into the gap under its own gravity. At this point, you can freely slide the bolt and open the safe.