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I've seen this a few times, so I want to point out something that is a general misconception. People often think that for key derivation, it's really important that I don't get repetition, since that is a break. However, this is actually very not true, and the opposite is true. I will explain.
The "ideal situation" is to just choose keys, truly at ...
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The present answer is made for the sake of answering an answerable question, and the cases where collisions actually matter: like, they are observed and we want to rule out it's by chance; or some authority specified that each smurf must have a unique key, and lack of a convincing argument for that separates the rubber stamp from the paperwork. See Yehuda ...
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