On the Fedora wiki it is mentioned that LUKS offers this protection.
LUKS does provide passphrase strengthening but it is still a good idea to choose a good (meaning “difficult to guess”) passphrase.
What is it exactly and how is it accomplished?
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It looks like you have already found an answer here:
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Ah, there’s no hiding it! 
I was curious if anyone on this board could give a complimentary answer. The more sources the better, although that answer is pretty comprehensive.
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