(disclosure - I've had conversations with the author of this tool) I'd say that it's HashKnownHosts that is impractical, not the attack. One of the reasons som

(disclosure - I've had conversations with the author of this tool) I'd say that it's HashKnownHosts that is impractical, not the attack. One of the reasons someone would publish a tool like this is to raise awareness of the brittle security HashKnownHosts offers vs. modern GPUs.