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You can bootstrap key exchange from a short-lived password. Not perfect but at least limits the attack time window. Companies serious about security just have

You can bootstrap key exchange from a short-lived password. Not perfect but at least limits the attack time window. Companies serious about security just have a trusted person hand out hardware with signed keys on it.

andi999 6y ago
So is there a backup of the key on the hardware somewhere (in case it gets lost or destroyed)
- praptak 6y ago
  Once you have exchanged the keys nothing stops you from creating new ones. You can for example register an additional backup Yubikey.