Identifying People from Their Metadata
Jonathan Mayer, Patrick Mutchler, and John C. Mitchell, “Evaluating the privacy properties of telephone metadata“:
Abstract: Since 2013, a stream of disclosures has prompted reconsideration of surveillance law and policy. One of the most controversial principles, both in the United States and abroad, is that communications metadata receives substantially less protection than communications content. Several nations currently collect telephone metadata in bulk, including on their own citizens. In this paper, we attempt to shed light on the privacy properties of telephone metadata. Using a crowdsourcing methodology, we demonstrate that telephone metadata is densely interconnected, can trivially be reidentified, and can be used to draw sensitive inferences.
New research, but not a new result. There have been several similar studies over the years. This one uses only anonymized call and SMS metadata to identify people who volunteered for the study.
Rolf Weber • May 19, 2016 10:17 AM
I think few people will deny the results of this study, that metadata can be very telling.
But the point is, there is not only the technical possibility, there is also the law. So even if we realize that the metadata can be abused, we can anyway reasonably decide that democratic governments should have the data, because we trust that it will only be used lawfully, and we think that the data will help to prevent and investigate crimes. Nothing else we already do today for example with the police, we give them guns and jails, and we trust that they use it only lawfully — and we trust that those who abuse their power are punished.