Privacy in Practice with Smart Pseudonymization: Lessons from the Belgian Public Sector

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" summary

Three concrete systems are described with code and measurements: format-preserving pseudonymization using 32‑byte symmetric keys and a REST API to replace SSNs for test environments (keeps legacy formats); blind pseudonymization that blinds/unblinds and encrypts pseudonyms so prescription services, doctors and the key manager each see only what they must (live in Belgian e‑health); and oblivious join that joins 200k / 500k / 1M inputs to produce a 50k intersection in under two minutes with a few hundred MB exchanged, backed by pending academic proofs.

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" chapters (13)

1. 0:00Introduction to talk
2. 0:26History of pseudonyms
3. 2:12Smart pseudonymization overview
4. 3:14Problem with test data
5. 7:28Format preserving pseudonymization
6. 12:02Pseudonymization service design
7. 17:20Health blind pseudonymization
8. 19:07Referral prescriptions use case
9. 27:33Partial encryption in healthcare
10. 34:00Oblivious join for research
11. 43:35Oblivious join in practice
12. 46:23Academic validation of oblivious join
13. 48:56Conclusion and Q&A

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