Bagci, Ibrahim Ethem and Roedig, Utz (2013) Node identification using clock skew. In: Real-World Wireless Sensor Networks : Proceedings of the 5th International Workshop, REALWSN 2013, Como (Italy), September 19-20, 2013. Lecture Notes in Electrical Engineering . Springer Verlag, Berlin, pp. 111-123. ISBN 9783319030708
Node_Identification_Using_Clock_Skew.pdf - Accepted Version
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Abstract
Clocks on wireless sensor nodes experience a natural drift. This clock skew is unique for each node as it depends on the clocks manufacturing characteristics. Clock skew can be used as unique node identifier which is, among other applications, useful for node authentication. We describe how clock skew of a node’s clock can be measured directly on a node by utilising the available high precision radio transceiver clock. We detail an implementation of this proposed local clock skew tracking method for the Zolertia Z1 platform. We determine the required sampling effort to accurately determine clock skew. We also discuss how clock skew measurements can be aligned with existing transceiver operations in order to avoid an increase in energy consumption.