In the paper, the authors designed a distributed fusion rules with security scheme FRSM to prevent the eavesdropping during the data transmission in an open WSN. To make the enemy fusion center totally ignorant the true fusion result, the sensor data is randomly flipped by an random function with known probability density function, while the ally fusion center can properly detect an unknown target by performs the LLR fusion rules based on the known probability density function. The theory analysis and comparison result demonstrated that good fusion result can be got by the AFC, and the EFC is prevent to detect target even under high signal to noise ratio or with lots of sensors, which guarantees the confidentiality of sensor data.
