rsa - Best practices for personal private keys -


i'm starting use rsa keys in daily work, , have few questions regarding best ways use them.

the biggest question revolves around idea of multiple clients , multiple servers. here's scenario:

i have 2 client computers:

  1. desktop
  2. laptop

and there 2 servers authenticating:

  1. my own local server
  2. remote service (e.g. github)

so, generally, how many key-pairs recommend in situation?

  • one key-pair: key "me" , use everywhere.
  • one per client: key "this client" , put on each server mean connect client.
  • one key-pair per server: key "for service", , bring private key each client want connect from.
  • one every combination: every unique client-server pairing has own key-pair.

if none of these significantly superior or worse other, can outline pros , cons of each person choose themselves?

of 4 options, 2 are:

  • one per client: key "this client" , put on each server mean connect client.

    this gives easy ability revoke keys specific client in event compromised -- delete 1 key on every service. scales linearly in number of clients, make key management easier. fits neatly openssh key model, give every client 1 key used on multiple servers. (you can other models openssh, nice. easiest thing happens without effort on part.)

  • one every combination: every unique client-server pairing has own key-pair.

    this has downside of forcing revoke multiple keys when single client compromised, it'll 1 key per service anyway, isn't worse. better upside it'll harder 1 service serve middleman between , service. not real concern of time, if (laptop,server,smtp) key being used (laptop,server,ssh), you'd have opportunity notice oddity. i'm not sure ability worth quadratic increase in keys manage.


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