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A man looking at a smartphone with the tracing app SwissCovid, using Decentralized Privacy-Preserving Proximity Tracing (DP-3T), during the state of emergency of the coronavirus disease (COVID-19) outbreak, during the state of emergency of the coronavirus disease (COVID-19) outbreak at the campus of the Swiss Federal Institute of Technology, EPFL, in Lausanne, Switzerland, Monday, May 25, 2020. Secure contact tracing could be a powerful tool to fight the spread of COVID-19. A unique, decentralized system developed as part of an international consortium, including Swiss Federal Institute of Technology, EPFL Lausanne and ETH Zurich, will soon be launched with the support of the Swiss Federal Office of Public Health. DP-3T proposes a secure, decentralized, privacy-preserving proximity tracing system based on the Bluetooth Low Energy standard. Its goal is to simplify and accelerate the process of identifying people who have been in contact with someone infected with the SARS-CoV-2 virus.(KEYSTONE/Laurent Gillieron).