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Remotely-fielded unattended sensor networks generally must operate at very low power -in the milliwatt or microwatt range -and thus have extremely limited communications bandwidth. Such sensors might be asleep most of the time to conserve power, waking only occasionally to transmit a few bits. RFID tags for tracking or material control have similarly tight bandwidth constraints, and emerging nanotechnology devices will be even more limited. Since transmitted data is subject to spoofing, anddoi:10.2172/920442 fatcat:yyue7au3qfdslj25c763pv4o3q