%I Association for Computing Machinery (ACM) %X Lessons from a pandemic. %N 9 %D 2022 %O This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ %J Communications of the ACM %V 65 %A Carmela Troncoso %A Dan Bogdanov %A Edouard Bugnion %A Sylvain Chatel %A Cas Cremers %A Seda Gürses %A Jean-Pierre Hubaux %A Dennis Jackson %A James R Larus %A Wouter Lueks %A Rui Oliveira %A Mathias Payer %A Bart Preneel %A Apostolos Pyrgelis %A Marcel Salathé %A Theresa Stadler %A Michael Veale %L discovery10154318 %P 48-57 %T Deploying decentralized, privacy-preserving proximity tracing