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Since the beegining of the Covid-19 crisis, states and private company work on App to track the people who can be infected because they were more than 15minutes at less than 2 meters in the last 2 weeks close to someone with a positive test.

They are using Bluetooth to communicate between the devices which “comply” to the UE policy but …

You have here 2 documents one in French simple and easy to read that explain simply how it work and clear privacy/security issue. The next document is about SwissCovid and issues this article is a real scientific publication a bit moure complex to understand.

French  :

English :

Take care.