Source location privacy against laptop-class attacks in sensor networks
Proceedings of the 4th international conference on Security and privacy in communication netowrks
Achieving Better Privacy Protection in Wireless Sensor Networks Using Trusted Computing
ISPEC '09 Proceedings of the 5th International Conference on Information Security Practice and Experience
Privacy-aware mobile services over road networks
Proceedings of the VLDB Endowment
Protecting location privacy in large-scale wireless sensor networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Towards statistically strong source anonymity for sensor networks
ACM Transactions on Sensor Networks (TOSN)
Privacy Provisioning in Wireless Sensor Networks
Wireless Personal Communications: An International Journal
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Although the content of sensor messages describing "events of interest" may be encrypted to provide confidentiality, the context surrounding these events may also be sensitive and therefore should be protected from eavesdroppers. An adversary armed with knowledge of the network deployment, routing algorithms, and the base-station (data sink) location can infer the temporal patterns of interesting events by merely monitoring the arrival of packets at the sink, thereby allowing the adversary to remotely track the spatio-temporal evolution of a sensed event. In this paper, we introduce the problem of temporal privacy for delaytolerant sensor networks and propose adaptive buffering at intermediate nodes on the source-sink routing path to obfuscate temporal information from an adversary. We first present the effect of buffering on temporal privacy using an information-theoretic formulation and then examine the effect that delaying packets has on buffer occupancy. We evaluate our privacy enhancement strategies using simulations, where privacy is quantified in terms of the adversary's estimation error.