Huawei Contact Shield is a service that utilizes Bluetooth Low Energy to record nearby people with whom a user has contact with. Developers can implement this technology in Android devices to potentially reduce the spread of COVID-19. If a user is tested positive for COVID-19, the third-party application asks for the user's authorization, obtains the user's shared key, and uploads the key to the diagnosis server. The API returns the risk of getting infected by determining the distance between diagnosed and undiagnosed individuals.
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