In:Confidence 2019 - Demonstrating Re-identification of Location Data
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Charlie Cabot, Research Lead, Privitar, re-identifies a location trace live on the In:Confidence 2019 main stage (April 4th at Printworks, London).
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In:Confidence 2019 - Demonstrating Re-identification of Location Data
- 2. Cell towers The British Library Green Park South Bank Sir John Soane’s Museum Printworks 1/1/19 10:35am 1/1/19 10:07am 1/1/19 11:12am 1/1/19 10:44am 1/1/19 2:01pm St. Paul’s Cathedral 1/1/19 12:01pm What is a location trace?
- 3. Source: mastdata.com • In the Canada Water area, where we are now, there is a ‘tower’ every few blocks • In urban areas ‘towers’ are often small structures on top of buildings, not tall freestanding towers Every few blocks • Towers are pinged when you move to a new cell, send or receive a call/text, or start a data session Every few minutes How detailed are location traces?
- 4. Background information about location traces is available online Instagram Facebook Twitter LinkedIn
- 5. We have some background information about someone in the audience Is it enough to identify them? PLEASE STAND UP
- 6. They were in Southwark at 11pm on Wednesday If you were in the borough of Southwark at 11pm Wednesday, stay standing! Otherwise, or if you’re not sure, sit down!
- 7. They were in Westminster at 9am on Monday If you were in the city of Westminster at 9am Monday, stay standing! Otherwise, or if you’re not sure, sit down!
- 8. They were in Greenwich at 9pm on Saturday If you were in the borough of Greenwich at 9pm Saturday, stay standing! Otherwise, or if you’re not sure, sit down!
- 9. They were in Newham at 7pm on Saturday If you were in the borough of Newham at 7pm Saturday, stay standing! Otherwise, or if you’re not sure, sit down!
- 10. They were in Hackney at 2pm last Thursday If you were in the borough of Hackney at 2pm last Thursday, stay standing! Otherwise, or if you’re not sure, sit down!
- 11. They were in Newport at noon on Monday If you were in the Newport, Wales at noon on Monday, stay standing! Otherwise, or if you’re not sure, sit down!
- 12. Re-identified!
- 13. Takeaways 1. It only takes a few data points to single out an individual 2. Re-identification leads to privacy harm • Stalking • Disclosure of hospital visits • Disclosure of who you’re meeting up with 3. Generalising locations to borough level didn’t work 4. For more, see papers on unicity by Yves-Alexandre de Montjoye Thank you for participating! Source: De Montjoye, Yves-Alexandre, et al. "Unique in the crowd: The privacy bounds of human mobility." Scientific reports 3 (2013): 1376.