Enhancing Source-Location Privacy in Sensor Network Routing P.Kamat,
Enhancing Source-Location Privacy in Sensor Network Routing P.Kamat, Y. Zhang, W. Trappe, C. Ozturk In Proceedings of the 25th IEEE International Conference on Distributed Computing Systems Natalia Stakhanova cs610 Sensor networks Security threats concerns with data security necessity to protect content of the data packages transferred through the network
privacy threats associated with sensors devices necessity to secure the transmission of the data, for ex. location of the sensor node providing particular information Presented work addresses this issue Example: pander-hunter game Sensors are monitoring the habitat of pandas
once panda is observed - the information is reported to the base station hunter desires to capture panda Assumptions one panda, one hunter and one base station hunter is equipped with rich memory and power resources and is able to identify the immediate sender knowing signal strength and the angle of the arrived message Privacy metrics
the safety period number of messages initiated by the sensor monitoring the panda. the capture likelihood the probability that hunter can capture panda within a specified time period. Considered routing protocols
Two baseline techniques flooding message is broadcasted to all neighbors single-path routing message is routed to one of the neighbors Improvements for these techniques
each technique is associated with behavioral hunter model Performance: baseline routing protocols The safety period is the same as the length of the shortest routing path. Patient hunter model hunter waits at the base station for message moves to the immediate sender of that message repeats until reaches the source node flooding single-path routing The
capture likelihood is high with single source routing, much lower with probabilistic routing Improvement: routing with fake sources introduce new sources that inject fake messages into the network two challenges: How to chose fake source Rate of fake messaging
Routing with fake sources Fake source source is h hops away, sends message to the sink sink sends a message into opposite direction once message reached node in h hops away from sink it becomes a fake source Rate of fake messaging
Slow rate hunter finds the real source fast At the rate of the real messaging hunter struggles between fake and real source High rate hunter is kept at the fake source real source fake source Performance: routing with fake sources
Fast speed of fake messaging provides good privacy! But it wont work for more sophisticated hunter Perceptive hunter model hunter is able to detect deception for ex. can keep the history of visited nodes Improvement: phantom routing Introduces two phases:
random walk message is routed in random fashion for h hops flooding/single-path routing after h hops message is routed using baseline technique Random walk Flooding Phantom routing: further improvement
Pure random walk might not be efficient directed random walk a sector based directed random walk each node partitions neighbors into two sets S1, S2 (for ex. east/west) if message is sent to node in S1, then every node forwards it to the neighbors in set S1 only a hop-based directed random walk must know the hop count between sink and all nodes partition node into 2 sets: with hop count <
mine and > mine Performance: phantom routing Safety period for phantom single-source routing is higher than for phantom flooding single-path routing flooding Why: probability in single-source routing that message will intersect hunters path is small
in flooding this probability is still large Performance: phantom routing The capture likelihood - number of transmissions per message increases linearly for both techniques flooding However single-path routing Safety period increase is more dramatic So combined -> more
privacy Performance: phantom routing Caution hunter model hunter limits its listening time at node after timeout hunter returns to the previous node However does not provide more benefits hunter does not make much progress towards the real source Safety period is higher, while capture likelihood is lower Privacy in mobile sensor network
Mobility adds privacy Fast moving panda alone is sufficient to provide source privacy using single-source routing In phantom routing the privacy increases Conclusion Majority of the research efforts are focused on data security
There are some works on protecting privacy associated with network devices not appropriate for sensor networks This is one of the first efforts to address sensor location privacy in sensor network ???
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