Re:NSA “precomputed contact chaining” enhances phone-record ...
by walterbell on Sunday May 24, 2020 @03:51PM
(#23294171)
> when a phone downloads that list
After exposure, a time-bounded (?) graph of proximity contact data can join the central list, via the state health app using the local data. This can be cross-referenced with other metadata.
Once a human contact tracer establishes communication with the owner of a phone's random identifier, the identifier can be de-anonymized.
Even without the new APIs, each phone's location can be collected and shared by telcos, at the granularity of cell tower triangulation.
After exposure, a time-bounded (?) graph of proximity contact data can join the central list, via the state health app using the local data. This can be cross-referenced with other metadata.
Once a human contact tracer establishes communication with the owner of a phone's random identifier, the identifier can be de-anonymized.
Even without the new APIs, each phone's location can be collected and shared by telcos, at the granularity of cell tower triangulation.