If you ever test positive for COVID-19, you can choose to share your anonymous keys with other app users to notify them of a possible exposure.
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If you receive a notification, you will be directed to instructions on what to do next and how to keep yourself and the people around you safe. You will be notified of an exposure only if the calculation meets the risk threshold. If you have a matching key, the app runs a mathematical calculation developed by epidemiologists using the date, duration, and signal strength to assess your level of risk. Several times a day, your phone downloads a list of all the anonymous keys associated with positive COVID-19 cases, and checks them against the list of anonymous keys it has encountered in the last 14 days. These keys are stored on your phone for 14 days, then automatically deleted.
Your phone will record the day that the anonymous keys were received, the duration of the signal, and the distance between the two phones (using Bluetooth signal strength as an approximation). It does not drain your battery or use data. This is a passive process that begins once you opt in and functions without the app open. Whenever you carry your phone with you and are near other people, your phone and theirs will work in the background, exchanging these privacy-preserving anonymous keys. Keys change every 10-20 minutes to further preserve your identity and privacy. These keys can’t be used to identify your location. When you opt in and the Bluetooth is on, your smartphone will generate and transmit anonymous keys (long strings of random characters).
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