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  •  Imagine a table with a lot of blank cells. With 3 attributes/columns (birthdate, zip code and gender) I can reidentify 80%+ of Americans and find their home address.
  • With 15 attributes (columns) I can re-identify 99.98% of Americans.
  • Anonymized taxi trajectories in NYC; bike-sharing trips in London, subway data in Riga, mobile phone & credit card data sets have all been deanonymized to reveal specific individuals.
  • “33 bits of entropy” – a practical tool and a privacy nightmare.
  • Oracle Data Cloud tracks 40,000 items per person online.

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