Secure and self-stabilizing clock synchronization in sensor networks

  • Authors:
  • Jaap-Henk Hoepman;Andreas Larsson;Elad M. Schiller;Philippas Tsigas

  • Affiliations:
  • TNO, ICT and Radboud University Nijmegen;Department of Computer Science and Engineering, Chalmers University of Technology and Göteborg University;Department of Computer Science and Engineering, Chalmers University of Technology and Göteborg University;Department of Computer Science and Engineering, Chalmers University of Technology and Göteborg University

  • Venue:
  • SSS'07 Proceedings of the 9h international conference on Stabilization, safety, and security of distributed systems
  • Year:
  • 2007

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Abstract

In sensor networks, correct clocks have arbitrary starting offsets and nondeterministic fluctuating skews. We consider an adversary that aims at tampering with the clock synchronization by intercepting messages, replaying intercepted messages (after the adversary's choice of delay), and capturing nodes (i.e., revealing their secret keys and impersonating them). We present the first self-stabilizing algorithm for secure clock synchronization in sensor networks that is resilient to such an adversary's attacks. Our algorithm tolerates random media noise, guarantees with high probability efficient communication overheads, and facilitates a variety of masking techniques against pulse-delay attacks in the presence of captured nodes.