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Sensors 2011, 11(4), 4118-4136; doi:10.3390/s110404118

A Lightweight Data Integrity Scheme for Sensor Networks

1,*  and 2
1 Department of Electrical and Computer Engineering, University of Sharjah, P.O. Box 2727, Sharjah, UAE 2 Dubai World, P.O. Box 4399, Dubai, UAE
* Author to whom correspondence should be addressed.
Received: 10 March 2011 / Accepted: 6 April 2011 / Published: 7 April 2011
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Limited energy is the most critical constraint that limits the capabilities of wireless sensor networks (WSNs). Most sensors operate on batteries with limited power. Battery recharging or replacement may be impossible. Security mechanisms that are based on public key cryptographic algorithms such as RSA and digital signatures are prohibitively expensive in terms of energy consumption and storage requirements, and thus unsuitable for WSN applications. This paper proposes a new fragile watermarking technique to detect unauthorized alterations in WSN data streams. We propose the FWC-D scheme, which uses group delimiters to keep the sender and receivers synchronized and help them to avoid ambiguity in the event of data insertion or deletion. The watermark, which is computed using a hash function, is stored in the previous group in a linked-list fashion to ensure data freshness and mitigate replay attacks, FWC-D generates a serial number SN that is attached to each group to help the receiver determines how many group insertions or deletions occurred. Detailed security analysis that compares the proposed FWC-D scheme with SGW, one of the latest integrity schemes for WSNs, shows that FWC-D is more robust than SGW. Simulation results further show that the proposed scheme is much faster than SGW.
Keywords: wireless sensor network; security; data integrity; watermarking wireless sensor network; security; data integrity; watermarking
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kamel, I.; Juma, H. A Lightweight Data Integrity Scheme for Sensor Networks. Sensors 2011, 11, 4118-4136.

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