Localized Flooding Backbone Construction for Location Privacy in Sensor Networks

Source and destination location privacy is a challenging and important problem in sensor networks. Nevertheless, privacy preserving communication in sensor networks is still a virgin land. In this paper, we propose to protect location privacy via a flooding backbone, which is modeled by a minimum connected dominating set (MCDS) in unit-disk graphs. We design an efficient and localized algorithm to compute an approximate MCDS. Theoretical analysis indicates that our algorithm generates a connected dominating set(CDS)withasizeatmost148 · opt +37, where opt is the cardinality of a MCDS. To our best knowledge, this algorithm is the first localized algorithm with a constant performance ratio for CDS construction in unit-disk graphs.