http://tzoz3bensgxyzs7da7lpgsn3a74h7hlbm4wa6ytq2tg6ktd57w22vqqd.onion/doc/about/openpgp_keys/index.en.html
Plugging other removable media in the air-gapped Tails to send the
public key, secret key stubs, parts of the secret master key, and so on
to the outside world. Plugging other removable media in the air-gapped Tails to receive Debian
packages, public keys, and so on from the outside world.