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Not talking about a hacker. I am stating that the described hash dance offers no exclusion from GDPR as saying "we promise we won't look" would do.

My point about brute forcing being useless, is that you hold all the information needed to re-create the hash. All but one tiny piece that is the random number. so brute force is a very effective O(<tiny piece size>). And since it is stored in your locally available data, there is no rate constraints.

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> I am stating that the described hash dance offers no exclusion from GDPR as saying "we promise we won't look" would do.

Under your logic, you would never trust us because we could just add $log->write(UserIp, UserAgent, Hostname, Path) in plain text. Trust is very important and what you do with the data is important under GDPR.

And we don't hold all the information to re-create the hash, that's the thing.

I thought a lot about "Oh but you could just do this, this and this" but, no, that argument doesn't hold. Our obligation under GDPR is what we actually do with data.

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