Cell tower based contact tracking is already used to infer someone's social graph and pattern-of-life. Bluetooth association data - even with opaque tokens - ca

Cell tower based contact tracking is already used to infer someone's social graph and pattern-of-life. Bluetooth association data - even with opaque tokens - can easily be correlated with cell tower movement to refine CO-TRAVELER style analysis. Cell-tower-resolution analysis is already very powerful - it can trivially reveal someone's associations and overall behavior. When correlated with short-range proximity data, I suspect the same analysis might reveal behavioral details within a organization ("which meetings you attend" instead of merely "what address you work at"). https://www.washingtonpost.com/world/national-security/nsa-tracking-cellphone-locations-worldwide-snowden-documents-show/2013/12/04/5492873a-5cf2-11e3-bc56-c6ca94801fac_story.html https://www.washingtonpost.com/world/national-security/nsa-t... https://www.eff.org/deeplinks/2013/12/meet-co-traveler-nsas-cell-phone-location-tracking-program https://www.eff.org/deeplinks/2013/12/meet-co-traveler-nsas-...