Related to above, considerable piece brief intro below.
How Reliable Is Smartphone-Based Electronic Contact Tracing for COVID-19?
By Philipp H. Kindt, Trinad Chakraborty, Samarjit Chakraborty
Communications of the ACM, January 2022, Vol. 65 No. 1, Pages 56-6 10.1145/3471933
With global surges of the novel Coronavirus SARS-CoV-2 in 2020 and 2021, electronic contact tracing has been adopted in different countries, the goal being to identify the most relevant contacts with a reasonable reliability. Owing to the need to quickly reduce the number of transmissions, contact-tracing solutions built on smartphones were developed because they could be mass-deployed on short notice. Their major advantage was that the hardware was already deployed and only the software remained to be developed.
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