For example (from the paper) in a decentralised approach how would you protect against: The targeted false alerts problem Assume an attacker wishes to target

For example (from the paper) in a decentralised approach how would you protect against: The targeted false alerts problem Assume an attacker wishes to target a particular user and cause them to self-isolate. They can get sufficiently close to the target to create a proximity event that will score as high risk. If the attacker self-decalres symptoms, in the process submitting this contact event, the target will be notified to self-isolate The mass notification problem Consider a malicious user, who can collect broadcast identities from around a particular area, such as a hospital, and record them all. They can register a malicious pseudo-device and generate realistic-looking but entirely fake contact events for all the BroadcastValues it has observed.