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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Again, I know it's not amazing security but it's not inherently bad. The key (actually encrypted), if (not when) compromised would provide the same level of access to my system as having two keys with one compromised. Assuming I'm an all knowing wizard and can smell when a key is compromised, I can log in remotely and replace the old key with a freshly generated one. More likely however is that if anybody was going to actually do something with my compromised key, they'd clear my authorized_keys file and replace it with a key I don't have access to. Don't kid yourself into thinking having multiple keys suddenly makes you 10x more secure.
What's more likely is someone finds my flashdrive on the ground, goes "oh boy free flashdrive full of Linux ISOs and recovery tools!" And proceeds to wipe it and use it for their own shit, while I regenerate a new key when I notice it missing.
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.