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This concerned me because we have a huge amount of product function dedicated to Exposure Notifications: Safe Places Redaction & Publishing, Health Authority config in Safe Paths, and the Exposure Notification processing itself. Betwene Betweeb them these add up to about 50% of the product. Is it really not needed?
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Update Safe Paths App to log a minimum number of points of concern before generating a notification (value TBD > 75% over > N points = 30 mins?) - Specify in HA JSON file as a global settingsuggested default: > 66% of points over a 30 min period)
These parameters to be specfied by the HA in their HA JSON file (as a global setting), with guidance provided on what we believe are suitable settings.
Reduce default exposure time for a point of concern from (0 mins to 4 hours) to (-5 mins to +5 mins). This reflects the fact that we believe that trying to capture fomite transmission will yield too many false positives, so we are only focussing on person-to-person transmission.
Hashing Details
Published data points should be geohashes (less-precise than specific GPS points), and stored as a SHA-256 hash of (geohash, time-bin) (where time-bin is a 5 minute rounded-down time interval in UTC).
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