How come Key A can open Lock A. Key B can open Lock B. But not lock A. And key C can open all the locks? Doesn’t that mean A and B should be able to open each other?
In: 731
So, the shape of the key, and the parts inside a lock correlate to a numbered code. Physical math. In fact, your key may have it’s code written on it, usually 5 or 6 digits.
A number like 6, could also be 4+2.
So you have two locks, each with five pins (numbery bits)
[6] [6] [6] [4+2] [6]
[6] [4+2] [6] [6] [6]
Now, we have 3 keys, A, B, and Master.
Key A is [6 6 6 4 6]
Key B is [6 4 6 6 6]
You could then have a Master Key coded to [6 6 6 6 6] that would open both. And yes, there are a couple other combinations, like [6 4 6 4 6] that would also work. It’s a little more complex/precise than that, but that’s the idea.
Because of that, setting up doors for a master key system makes them much easier to pick as there are multiple succesful paths, with it getting exponentially so with each extra key/lock you’re tying in.
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