Where's Wally?
Iasonas Polakis, George Argyros, Theofilos Petsios, Suphannee Sivakorn, Angelos D. Keromytis · 2015
Location proximity schemes have been adopted by social networks and other smartphone apps as a means of balancing user privacy with utility. However, misconceptions about the privacy offered by proximity services have rendered users vulnerable to trilateration attacks that can expose their location. Such attacks have received major publicity. and, as a result, popular service providers have deployed countermeasures for preventing user discovery attacks.