There are two threat models: - Virtual - Physical In the virtual threat model, difficulty needs to be insane, since any of 7 billion people can launch automa

There are two threat models: - Virtual - Physical In the virtual threat model, difficulty needs to be insane, since any of 7 billion people can launch automated attacks on my server. In the physical threat model, difficulty can be moderate, since the only people who can attack are ones physically here. My front door has a pickable lock, and my windows are breakable. My key threat is my crazy stalker ex. Fingerprints are usually in the latter category, and provide pretty good security.