Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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No, it is inherently bad to copy around private keys. You have some fundamental misunderstandings of how key authentication security works. RTFM.
It's not "best practice", but a compromised key is a compromised key whether that key is used to connect 1 or 100 computers to a server. No, I can't shut off access to exactly one machine, I do not however have any difficulty in shutting off access to every machine and replacing it with a new key. Your system and my system are no different with a single compromised key.
If I had 100 computers that I had to change identity files on each time it was compromised, and my keys were being compromised often, I would see a benefit from using multiple different keys.
Quit acting like I've left the front door to my house open when the door is locked but my roommate and I share the same key.
None of what you've just said here is true. They don't work like house keys. Your system and my system are VERY different because I'm not making copies of my private keys anywhere. They never leave the safe place I created them. I only ever transfer the public keys. I could post my public keys here and there would be no security compromise for me. You came here asking for help. I tried to help you. I'm sorry it wasn't what you wanted to hear. Your attitude sucks.