Institute of Electrical & Electronic Engineers
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, the authors 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), they 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.