You can unscramble the hashes of humanity's 5 billion email addresses in ten milliseconds for $0.0069

This is not news to anyone who deals with “anonymised” health data. Nearly all anonymised health data released for research, etc, is so poorly done that it is a trivial matter to re-identify records. Typically, “we don’t release people’s names” is considered adequate anonymisation. The fact that parts of addresses, DOB, gender, etc are released indicates the lack of sophistication in this area.

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