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Smartphones in a Microwave: Formal and Experimental Feasibility Study on Fingerprinting the Corona-Warn-App. (arXiv:2307.02931v1 [cs.CR])
cs.CR updates on arXiv.org arxiv.org
Contact Tracing Apps (CTAs) have been developed to contain the coronavirus
disease 19 (COVID-19) spread. By design, such apps invade their users' privacy
by recording data about their health, contacts, and partially location. Many
CTAs frequently broadcast pseudorandom numbers via Bluetooth to detect
encounters. These numbers are changed regularly to prevent individual
smartphones from being trivially trackable. However, the effectiveness of this
procedure has been little studied. We measured real smartphones and observed
that the German Corona-Warn-App (CWA) exhibits a …
app apps bluetooth broadcast contacts contact tracing corona coronavirus covid data design detect disease fingerprinting health location numbers privacy recording smartphones study tracing