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Perhaps worth noting that mac addresses do not have 48 bits of entropy. You can prioritize the OUIs actually being used in consumer NICs and chop that down substantially.

IP addresses don't have 32 bits of entropy either for that matter.




That's true. However, with adequate salting it really shouldn't matter.

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I think the idea of the hash for IM is to prove uniqueness in a dispute. Salting the hash would make it useless in that case.

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