research-article

Implementing public-key infrastructure for sensor networks

Authors:

David J. Malan,

Michael D. SmithAuthors Info & Claims

ACM Transactions on Sensor Networks (TOSN), Volume 4, Issue 4

Article No.: 22, Pages 1 - 23

https://doi.org/10.1145/1387663.1387668

Published: 04 September 2008 Publication History

Abstract

We present a critical evaluation of the first known implementation of elliptic curve cryptography over F_2p for sensor networks based on the 8-bit, 7.3828-MHz MICA2 mote. We offer, along the way, a primer for those interested in the field of cryptography for sensor networks. We discuss, in particular, the decisions underlying our design and alternatives thereto. And we elaborate on the methodologies underlying our evaluation.

Through instrumentation of UC Berkeley's TinySec module, we argue that, although symmetric cryptography has been tractable in this domain for some time, there has remained a need, unfulfilled until recently, for an efficient, secure mechanism for distribution of secret keys among nodes. Although public-key infrastructure has been thought impractical, we show, through analysis of our original implementation for TinyOS of point multiplication on elliptic curves, that public-key infrastructure is indeed viable for TinySec keys' distribution, even on the MICA2. We demonstrate that public keys can be generated within 34 seconds and that shared secrets can be distributed among nodes in a sensor network within the same time, using just over 1 kilobyte of SRAM and 34 kilobytes of ROM. We demonstrate that communication costs are minimal, with only 2 packets required for transmission of a public key among nodes. We make available all of our source code for other researchers to download and use. And we discuss recent results based on our work that corroborate and improve upon our conclusions.

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cover image ACM Transactions on Sensor Networks

ACM Transactions on Sensor Networks Volume 4, Issue 4

August 2008

295 pages

ISSN:1550-4859

EISSN:1550-4867

DOI:10.1145/1387663

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Copyright © 2008 ACM.

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Publication History

Published: 04 September 2008

Accepted: 01 November 2007

Revised: 01 July 2007

Received: 01 August 2006

Published in TOSN Volume 4, Issue 4

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