Channel Aware Encryption and Decision Fusion for Wireless Sensor Networks
Channel Aware Encryption and Decision Fusion for Wireless Sensor Networks
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DOI：
10.1109/tifs.2013.2243145
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发表时间：
2013-04-01
影响因子：
6.8
通讯作者：
Ha, Jeongseok
中科院分区：
文献类型：
--
作者：
Jeon, Hyoungsuk;Choi, Jinho;Ha, Jeongseok
在无线传感器网络(WSNs)中，由于传感器通常受到复杂性和能量限制，安全性和能耗一直被认为是长期存在的技术挑战。在本文中，我们研究了一种简单而高效的物理层安全机制，以在分布式检测场景中提供数据机密性。特别是，为了防止被动窃听数据从传感器传输到盟军融合中心(AFC)，我们提出了一种新的加密方案和并行接入信道模型的判决融合规则。该方案利用无线信道的随机性这一免费的自然资源，对每个传感器的二进制局部判决进行加密，根据传感器和AFC之间的瞬时信道增益对二进制局部判决进行翻转。无线信道的位置特定和相互作用的属性使传感器和AFC能够共享无线信道固有的随机性，这是窃听者所不能获得的。此外，该方案非常适合于一种低复杂度、高能量效率的调制技术--非相干二进制频移键控。为了评估该方案的性能，分析了AFC中基于对数似然比的决策融合策略，并对决策性能进行了比较。此外，我们还证明了该方案具有完全保密性，且结构简单，适用于复杂度有限的传感器。
In wireless sensor networks (WSNs), security and energy consumption have been considered as long-lasting technical challenges as sensors usually suffer from complexity and energy constraints. In this paper, we study a simple and efficient physical-layer security to provide data confidentiality in a distributed detection scenario. In particular, to prevent passive eavesdropping on transmitting data from sensors to an ally fusion center (AFC), we propose a novel encryption scheme and decision fusion rules for a parallel access channel model. The proposed scheme takes advantage of a free natural resource, i.e., randomness of wireless channels, to encrypt the binary local decision of each sensor in such a way that the binary local decision is flipped according to instantaneous channel gain between the sensor and AFC. The location-specific and reciprocal properties of wireless channels enable the sensor and AFC to share the inherent randomness of wireless channels which are not available to an eavesdropper. Furthermore, it is shown that the scheme is well-suited to a low complexity and energy efficient modulation technique, noncoherent binary frequency shift keying. To evaluate performances of the proposed scheme, log-likelihood-ratio-based decision fusion strategies at the AFC are analyzed, and comparisons of decision performances are carried out. In addition, we prove that the proposed scheme achieves perfect secrecy with a simple structure that is suited for sensors of limited complexity.