As nobody competent will call hardware "tamper proof" these days (if somebody does, do not trust them), tamper resistance is all you get. And then it is essentially a question of effort invested. Eventually that may change, but at this time a password long enough to not be guessable and encryption with a key derived from that is the only somewhat secure solution.
Morale: Do not trust guessable passwortds (Score:2)
As nobody competent will call hardware "tamper proof" these days (if somebody does, do not trust them), tamper resistance is all you get. And then it is essentially a question of effort invested. Eventually that may change, but at this time a password long enough to not be guessable and encryption with a key derived from that is the only somewhat secure solution.