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Sensors 2015, 15(5), 11928-11952; doi:10.3390/s150511928

A Lightweight White-Box Symmetric Encryption Algorithm against Node Capture for WSNs

School of Software Engineering, Tongji University, No.4800 Cao'An Highway, Shanghai 201804, China
This paper is an extended version of the paper entitled “A Lightweight White-box Symmetric Encryption Algorithm against Node Capture for WSNs”, presented at IEEE WCNC 2014, Istanbul, Turkey, 6–9 April 2014.
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Academic Editor: Leonhard M. Reindl
Received: 26 February 2015 / Accepted: 8 May 2015 / Published: 21 May 2015
(This article belongs to the Section Sensor Networks)
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Abstract

Wireless Sensor Networks (WSNs) are often deployed in hostile environments and, thus, nodes can be potentially captured by an adversary. This is a typical white-box attack context, i.e., the adversary may have total visibility of the implementation of the build-in cryptosystem and full control over its execution platform. Handling white-box attacks in a WSN scenario is a challenging task. Existing encryption algorithms for white-box attack contexts require large memory footprint and, hence, are not applicable for wireless sensor networks scenarios. As a countermeasure against the threat in this context, in this paper, we propose a class of lightweight secure implementations of the symmetric encryption algorithm SMS4. The basic idea of our approach is to merge several steps of the round function of SMS4 into table lookups, blended by randomly generated mixing bijections. Therefore, the size of the implementations are significantly reduced while keeping the same security efficiency. The security and efficiency of the proposed solutions are theoretically analyzed. Evaluation shows our solutions satisfy the requirement of sensor nodes in terms of limited memory size and low computational costs. View Full-Text
Keywords: wireless sensor networks; white-box attack contexts; node capture; symmetric encryption algorithms wireless sensor networks; white-box attack contexts; node capture; symmetric encryption algorithms
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Shi, Y.; Wei, W.; He, Z. A Lightweight White-Box Symmetric Encryption Algorithm against Node Capture for WSNs. Sensors 2015, 15, 11928-11952.

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