Key re-dissemination for maintaining detection power in sensor networks

In many wireless sensor network (WSN) applications, sensor nodes are deployed in unattended environments, and hence are vulnerable to physical attacks, potentially compromising the node´s cryptographic keys. Sensor nodes are subject to compromise physically and surreptitious use by an adversary. The adversary can capture them to inject an incorrect data into the sensor field in order to reduce network life time. Ye et al. proposed the statistical en-route filtering scheme to detect and drop such false reports during the forwarding process. However if the number of filtering keys exposed to adversary is larger than or equal to the size of threshold, the forward nodes can not filter out a fabricated report. Also the base station can not filter the report. In this paper, we propose key dissemination method for maintaining detection power in statistical filtering based WSNs. Via simulation; we show the proposed method is better than existing one in terms of remaining energy and the number of fabricated reports which are not filtered out by forwarding nodes and the base station.