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?
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Imagine all the children in a family have their own bank account with a personal identification number.
But their parents also have a different, single, personal identification number that can can access all the children’s accounts.
So the analogy is that each of a ‘family’ of locks have to be created to allow *two* different keys to perform an unlock. This means the pins in each lock will have one break at a common position and another break at a variable position.
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