Yet, I agree I would not send my encrypted private key. But having
your divorced
spouse bruteforce 90 bit of passphrase just to annoy you... seems quite an
unreasonable threat to me.
It is. That's why that's not the threat being defended against.
The threat is against your spouse seeing you enter your passphrase.
It's very easy for roommates to discover each other's passwords and
passphrases; sometimes it happens by accident. Everyone knows not to
enter a passphrase with a shoulder surfer around, but if you and your
spouse are sitting on the couch with your laptops open and you receive
an encrypted email, are you really going to tell her, "Sorry, honey, I
have to take this into the other room so I can enter my passphrase
without worrying about you spotting it"?
So long as there's marital bliss, you're perfectly safe. You just
can't rely on that lasting forever.
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