this post was submitted on 21 Jul 2023
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No, the signatures wouldn't match.
That's an assumption that lemmy will quit federating with a server that does not match.
And what signature are we talking about anyway? Is not certificates...
Activitypub signatures that each user and group sends out their messages with.
It's not an assumption, it's how activitypub works.
Can you show me documentation that shows communities or servers are signed?
https://www.w3.org/wiki/SocialCG/ActivityPub/Authentication_Authorization
So looking at that spec... Nothing there is validation that current messages originate from an "original" server...
I don't think either of these signature options for Server to Server communications means that my current lemmy.saik0.com instance can't be torn down (delete LXC container) and reconfigured as a brand new instance (New LXC container) and other instances wouldn't know that there's been a change to the instance running here... or more accurately would flag a change. I think these signatures are all about not being able to spoof OTHER instances. eg, lemmy.ml can't send messages on behalf of lemmy.world.