Presentation from "The Net Will Not Forget" - European conference on ICT and privacy. www.ict-privacy.dk.

2. Secure Multiparty Computation – a technology with promises for privacy Jakob I. Pagter Centre for IT Security The Alexandra Institute Ltd.

3. Alexandra Instituttet A/S

5. Sugar Beets

8. Audits

10. Before 2007/2008 only bilateral tradetroughpaperads etc.

11. One of threefactoriesclosed and guaranteedpriceslowered => many farmerswanted to selltheirquota

12. Theoreticalanalysisindicatedthat a coordinatedexchangecan

13. Increasetrade up to 400%

17. Deep Confidentiality pk bid1 Epk(price) Epk(bid1) bid2 Epk(bid2) Epk(bid3) Nordic Sugar bid3 Growers Epk(bid4) bid4 Epk(bid5) bid5 SIMAP price

18. A privacy perspective Howcaninterestingstuffbe done withoutrevealing sensitive info

19. PET example 1: private DB “joins” Insurance company National health register Desirable outcome

20. PET example 2: private information retrieval Blood sample Result encrypted and shared Analysis SMC Query result QUERY SMC Only the patient knows query and result RESULT SMC SMC Anonymous computation

22. Storage

23. Peer-2-peer applications

24. Personal data in the cloud