6

I have created a master key with two subkeys: one for signing and the other for encryption. Finally, I have exported the two subkeys to a new machine.

How can I tell the new machine to consider the master as "ultimate", even if it is absent from the machine? Does it matter?

6

You can set every key to ultimate trust through opening the key edit command line

gpg --edit-key [key-id]

and running the trust command. You will now be prompted to select the trust level:

Please decide how far you trust this user to correctly verify other users' keys
(by looking at passports, checking fingerprints from different sources, etc.)

  1 = I don't know or won't say
  2 = I do NOT trust
  3 = I trust marginally
  4 = I trust fully
  5 = I trust ultimately
  m = back to the main menu

Your decision? 

Obviously, 5 will be the proper decision to achieve ultimate trust. Finally, save to commit the changes and exit GnuPG. The same commands apply to both GnuPG 1.4 and GnuPG 2 (and newer).

Ultimate enables a key to introduce trust in the OpenPGP web of trust, with other words all ultimately trusted keys act as a starting point for trust paths. You should set your own keys to ultimate trust, but usually will not do so for other's.

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