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This article introduces the novel concept of Spatiotemporal Multicast (STM),which is the issue of sending a message to mobile devices that have beenresiding at a specific area during a certain time span in the past. A widevariety of applications can be envisioned for this concept, including crimeinvestigation, disease control, and social applications. An important aspect ofthese applications is the need to protect the privacy of its users. In thisarticle, we present an extensive overview of applications and objectives to befulfilled by an STM service. Furthermore, we propose a first Cluster-basedSpatiotemporal Multicast (CSTM) approach and provide a detailed discussion ofits privacy features. Finally, we evaluate the performance of our scheme in alarge-scale simulation setup.

Geocast into the Past: Towards a Privacy-Preserving Spatiotemporal Multicast for Cellular Networks