: if all door locks are different and different keys open different locks, how does a universal key work?
In: Engineering
Probably only for advanced 5 year olds but [this paper explains master keyed lock sytems and how to make a master key when you only have a regular key. I might be odd but I think its a riveting read.](https://www.google.ie/url?sa=t&source=web&rct=j&url=https://eprint.iacr.org/2002/160.pdf&ved=2ahUKEwjTltDx3NDlAhXyunEKHfCBBtoQFjAOegQICRAB&usg=AOvVaw2Yx6L6LmfZaRNh6a5x0QR8)
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