Apple and Google have developed a standard API that authorities can use to create coronavirus contact tracing apps for specific countries or communities. These apps rely on a phone’s Bluetooth connectivity to ping nearby devices and create local records of that handshake.
When one of those users reports they have been diagnosed COVID-19 positive, a database will record that event. The phones enrolled in the tracing program will check that database with some regularity, and that’s how they’ll discover a record that one of their contacts tested positive in the past 14 days.
That’s when the user of the phone is notified that he or she may have been exposed to a coronavirus patient at some point in the past couple of weeks. Everything happens anonymously, with randomized ID numbers being assigned to phones and end-to-end encryption protecting data transmission.
Hit the link for much more.