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Reduction to
practice:
From DP3T to EN
to SwissCovid
Prof. E.Bugnion
EPFL
10.11.2020
3 digital scenarios
EdouardBugnion
MartinVetterli-EPFLPresident
2
Cell-phone
Surveillance
Proximity
Tracing
Crowd
Detection
Technology : triangulation
between cell phone tower,
data provided by operators
Use: monitoring
compliance
Privacy: limited
Technology: Bluetooth
anonymous exchanges
Use: one step ahead
Privacy: anonymous &
privacy-preserving
Technology: GPS location
Use: detect and avoid crowd
Privacy: citizens voluntarily
give location data
Decentralized Proximity Tracing 3
EdouardBugnion
4
Acollaborative
effort
SwissCovid
§ Only information that ever leaves
the phone are the random numbers
(no identity, no location, no
information about others)
broadcasted during the contagious
period
§ No information available for abuse
§ System sunsets-by-design
Securityandprivacy
bydesign
EdouardBugnion
5
ViennaCybrerSecurity&PrivacyCenter
Interdisciplinary team
(30+ researchers, 10 countries)
Privacy, Systems, Cryptography,
Wireless security, SW Security,
Requirements engineering,
Epidemiologists, Ethicists, Law
EdouardBugnion
6
Asmallpiece
inthepuzzle
Protocol(crypto)
App
Health
system
Law
Societal
impact
Epidemi
ology
Mobile
OS
ViennaCybrerSecurity&PrivacyCenter
EdouardBugnion
7
Impactworldwide
When we build something we have to pick an
architecture that works. And it has to work
globally, for all countries around the world.
And when we did the analysis and looked at
different approaches we were very heavily
inspired by the DP-3T group and their
approach — and that’s what we have
adopted as a solution. We think that gives
the best privacy preserving aspects of the
contacts tracing service.”
Dave Burke, VP of Android, Google, 24.4.2020
https://techcrunch.com/2020/04/24/apple-and-google-update-joint-coronavirus-tracing-
tech-to-improve-user-privacy-and-developer-flexibility/
“ Contact tracing can help slow the
spread of COVID-19 and can be done
without compromising user privacy.
We’re working with @sundarpichai &
@Google to help health officials
harness Bluetooth technology in a
way that also respects transparency
& consent.”
Time Cook, CEO, Apple, 10.4.2020
on Twitter
“
SwissCovid
EdouardBugnion
8
ImpactinSwitzerland
SwissCovid
SwissCovid
EdouardBugnion
9
Casestudy–CantonZHinSeptember
Prof.V.vonWyl,UNIZH
For 10 Covidcodes uploaded:
§ 22 calls to hotline; 5 recommended quarantine decisions,
§ 1 person tested with positive PCR results
EdouardBugnion
10
Nationalstatistics
asof9.11.2020
§ 1.87 Million active users (~22%)
§ 23,118 Covidcodes uploaded
• 7,633 in the past 7 days
§ 19,446 successful, fully documented,
calls to the Federal hotline
• (note: average was 1.7x/Covidcode
until recently)
§ At least 250 RT-PCR+ cases
documented that would not have
been tested without the app
• First indications of effectiveness,
speed, and complementarity to classic
contact tracing
• Probably a lot more than that
§ Key lesson learned : requires deep
integration into the PH process run by
the 26 cantons
SwissCovid
0%
5%
10%
15%
20%
25%
01.08.20 01.09.20 01.10.20 01.11.20
Covidcode entered / PCR+ ratio - RA7
Active App penetration - RA7
CovidCode entered / PCR+ - rolling average (7 days)
Active users / population - rolling average (7 days)
EdouardBugnion
11
Google/AppleENApps
inEurope
§ Design naturally enables cross-
board interoperability
• Users only need to consent to share
their keys
§ Allows national apps to work when
roaming
§ Two basic use cases:
• Subscribe to foreign feeds when
abroad (and for the 10 days that
follow)
• Add keys to another country’s set if
contagious in that country
§ Will be operated by EC e-Health
Network on October 17.
Decentralized, privacy-
preserving contact tracing in
Europe
SwissCovid
Thank you for
your attention
Edouard Bugnion

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Reduction to practice: From DP3T to EN to SwissCovid

  • 1. Reduction to practice: From DP3T to EN to SwissCovid Prof. E.Bugnion EPFL 10.11.2020
  • 2. 3 digital scenarios EdouardBugnion MartinVetterli-EPFLPresident 2 Cell-phone Surveillance Proximity Tracing Crowd Detection Technology : triangulation between cell phone tower, data provided by operators Use: monitoring compliance Privacy: limited Technology: Bluetooth anonymous exchanges Use: one step ahead Privacy: anonymous & privacy-preserving Technology: GPS location Use: detect and avoid crowd Privacy: citizens voluntarily give location data
  • 5. § Only information that ever leaves the phone are the random numbers (no identity, no location, no information about others) broadcasted during the contagious period § No information available for abuse § System sunsets-by-design Securityandprivacy bydesign EdouardBugnion 5 ViennaCybrerSecurity&PrivacyCenter
  • 6. Interdisciplinary team (30+ researchers, 10 countries) Privacy, Systems, Cryptography, Wireless security, SW Security, Requirements engineering, Epidemiologists, Ethicists, Law EdouardBugnion 6 Asmallpiece inthepuzzle Protocol(crypto) App Health system Law Societal impact Epidemi ology Mobile OS ViennaCybrerSecurity&PrivacyCenter
  • 7. EdouardBugnion 7 Impactworldwide When we build something we have to pick an architecture that works. And it has to work globally, for all countries around the world. And when we did the analysis and looked at different approaches we were very heavily inspired by the DP-3T group and their approach — and that’s what we have adopted as a solution. We think that gives the best privacy preserving aspects of the contacts tracing service.” Dave Burke, VP of Android, Google, 24.4.2020 https://techcrunch.com/2020/04/24/apple-and-google-update-joint-coronavirus-tracing- tech-to-improve-user-privacy-and-developer-flexibility/ “ Contact tracing can help slow the spread of COVID-19 and can be done without compromising user privacy. We’re working with @sundarpichai & @Google to help health officials harness Bluetooth technology in a way that also respects transparency & consent.” Time Cook, CEO, Apple, 10.4.2020 on Twitter “ SwissCovid
  • 9. SwissCovid EdouardBugnion 9 Casestudy–CantonZHinSeptember Prof.V.vonWyl,UNIZH For 10 Covidcodes uploaded: § 22 calls to hotline; 5 recommended quarantine decisions, § 1 person tested with positive PCR results
  • 10. EdouardBugnion 10 Nationalstatistics asof9.11.2020 § 1.87 Million active users (~22%) § 23,118 Covidcodes uploaded • 7,633 in the past 7 days § 19,446 successful, fully documented, calls to the Federal hotline • (note: average was 1.7x/Covidcode until recently) § At least 250 RT-PCR+ cases documented that would not have been tested without the app • First indications of effectiveness, speed, and complementarity to classic contact tracing • Probably a lot more than that § Key lesson learned : requires deep integration into the PH process run by the 26 cantons SwissCovid 0% 5% 10% 15% 20% 25% 01.08.20 01.09.20 01.10.20 01.11.20 Covidcode entered / PCR+ ratio - RA7 Active App penetration - RA7 CovidCode entered / PCR+ - rolling average (7 days) Active users / population - rolling average (7 days)
  • 11. EdouardBugnion 11 Google/AppleENApps inEurope § Design naturally enables cross- board interoperability • Users only need to consent to share their keys § Allows national apps to work when roaming § Two basic use cases: • Subscribe to foreign feeds when abroad (and for the 10 days that follow) • Add keys to another country’s set if contagious in that country § Will be operated by EC e-Health Network on October 17. Decentralized, privacy- preserving contact tracing in Europe SwissCovid
  • 12. Thank you for your attention Edouard Bugnion