> How would you look at someone using a single key for their car, house, safe, work place, and so on? This is a terrible analogy, and I don't see any other jus

> How would you look at someone using a single key for their car, house, safe, work place, and so on? This is a terrible analogy, and I don't see any other justification for this setup. An SSH "key" is also referred to as an "identity". Contrary to a car key, it is not tied to the car, but to the client's identity. It is more like a badge than a brass key. A car key has the limitation that your lock can only accept one key, and can't be easily updated to accept/refuse keys. You also can't remotely give somebody access (you have to hand them the key) and you can't prevent someone with the key from making a copy without returning it. An SSH key pair has none of those limitations so it's really not clear why anyone might want to manage them like car keys. If anything, the root password is more like a car key than a key pair is.