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Are ssh keys tied to a user or the originating machine?

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From	JimR <NotReally@yahoo.com>
Subject	Are ssh keys tied to a user or the originating machine?
Date	Sat, 21 Nov 2015 13:01:44 -0500
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I'm trying to better understand ssh.

User foo on machine bar generates a keypair, and provides the public key 
to remote user dokes on machine shme .   foo connects to dokes account 
at shme, and everything is happy.

Then user foo also has an account on machine baz.  He takes the private 
key he generated on machine bar, and copies it to machine baz.  Can he 
connect to dokes on shme?  My limited testing suggests that it works. 
Is that a universal truth?

Next, foo passes his private key to unrelated user thud on machine 
grunt.  thud installs the private key owned by foo.  Can thud now 
connect to user dokes on machine shme?

Next, replace the above ssh keys with PGP keys.  Do the same answers apply?

Thanks,
JimR

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Thread

Are ssh keys tied to a user or the originating machine? JimR <NotReally@yahoo.com> - 2015-11-21 13:01 -0500
  Re: Are ssh keys tied to a user or the originating machine? William Unruh <unruh@invalid.ca> - 2015-11-21 18:13 +0000
  Re: Are ssh keys tied to a user or the originating machine? Richard Kettlewell <rjk@greenend.org.uk> - 2015-11-22 14:09 +0000
  Re: Are ssh keys tied to a user or the originating machine? jc091966@gmail.com - 2018-06-03 19:25 -0700
    Re: Are ssh keys tied to a user or the originating machine? William Unruh <unruh@invalid.ca> - 2018-06-04 08:40 +0000
    Re: Are ssh keys tied to a user or the originating machine? "Carlos E.R." <robin_listas@es.invalid> - 2018-06-04 11:35 +0200
      Re: Are ssh keys tied to a user or the originating machine? Aragorn <thorongil@telenet.be> - 2018-06-04 12:24 +0200
        Re: Are ssh keys tied to a user or the originating machine? "Carlos E.R." <robin_listas@es.invalid> - 2018-06-04 13:15 +0200

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