SDL Technical Report SRI-SDL-04-02 • April 6, 2004 Lightweight Key Management in Wireless Sensor Networks by Leveraging Initial Trust Bruno Dutertre Steven Cheung Joshua Levy This research is sponsored by DARPA under contract number F30602-02-C-0212. The views herein are those of the authors and do not necessarily reflect the views of the supporting agency. System Design Laboratory • 333 Ravenswood Ave. • Menlo Park, CA 94025 • (650) 326-6200 • Facsimile: (650) 859-2844