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You are correct: if the password used to create the key is trivial, then there definitely exists hardware that can guess AES256 passwords even if a KDF is used weakly.

I'm not sure how to read that table. Is that really the cost for a 100,000 iteration PBKDF2?!?

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I have not checked 1Password's math--they just come up in the results for "PBKDF2 cost of brute forcing". ;)

But yes, it matches my intuition--brute forcing human-strength keys is surprisingly cheap. (And I don't know if they're taking into account the discount if you have custom ASICs for this, defend against which is the argument made for scrypt instead.)

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