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That was only because they chose a weak password. With a 100+ bit password, it's impossible.

Improbable.

When the average time to unlock is equal or greater to the probably heat death of the universe this distinction ceases to matter.

You could also get it right on the first guess, so its improbable not impossible.

True, though 100 bit passwords are extremely uncommon. Even deadhorsebatterystaple claims to be less than 50.