S_Firewall: A Firewall in Wireless Sensor Networks

Wireless sensor networks (WSNs) have wide applications both in military and civil fields. However, when deployed in untended/hostile area, WSNs may suffer all kinds of attacks like flooding, sinkhole, etc. To apply WSNs more practically and wildly, some secure countermeasures must be deployed in WSNs. In this paper, we design a kind of firewall scheme, which is based on mobile agent, to isolate the intruder with less communication overhead and memory cost. The S_Firewall can be generated automatically, distributively and in real time when network-wide attacks happen. The paper also proposes a route restoring scheme by local repair and makes a performance analysis by prototype implementation of S_Firewall