You may be aware that various apps are being proposed to help track individuals that have tested positive for Coronavirus.
Apple and Google are proposing a "decentralised" system where records of devices interacting with one another are stored on users’ phones. In this article, a coder with an interest in privacy describes how such a "decentralised" app could operate, and why it poses less risk to privacy than a "centralised" one powered by a single large database accessible by health authorities and/or governments.
Of course, will a "decentralised" app be useful if it can't provide some further detail regarding the time, place and circumstances of an encounter with an infected individual? A compromise between privacy and practicality is going to have to be struck.
The first thing that’s worth understanding is that good privacy-respecting apps are simple. In fact, they’re far less complex than the application most people think of when it comes to location tracking and surveillance.