A band-aid, I&#x27;m afraid.<p>Without going into the question of how many bits of entropy that actually has when used with human beings in real settings, and just assume it&#x27;s a perfect check; my question stands: how many people can you find who use this?<p>Many SSH clients don&#x27;t even support it, at all. PuTTY and almost anything that uses SSH for tunneling.<p>When they do: how many of your hosts do you know the image of?<p>Again: nice idea, but utterly impotent in our universe.<p>Compare to the efficiency of e.g. WPA2 keys: less theoretically beautiful, but much more efficient with humans.