Current distributed sensor network platforms lack comprehensive lowpower routing techniques and efficient public key cryptography mechanisms. Reducing power for individual radio transmissions has not been explored sufficiently. Popular sensor node platforms do not include a mechanism for distributing and redistributing shared cryptographic keys among nodes. This paper discusses a technique to tailor node transmit power to the lowest practical level while maintaining reliable network links and presents the first known implementation of elliptic curve cryptography for sensor networks. Results demonstrate that dynamic radio output power scaling is effective in reducing node power consumption by orders of magnitude in certain scenarios. Analysis suggests that secret-key cryptography is already viable on the UC Berkeley MICA2 mote and public-key infrastructure may also be tractable despite the device’s limited memory.
To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.