MUN SU KIM
School of Information and Communication Engineering, Sungkyunkwan University, 300 Cheoncheon-Dong, Jangan-Gu, Suwon 440-746, Korea
TAE HO CHO
School of Information and Communication Engineering, Sungkyunkwan University, 300 Cheoncheon-Dong, Jangan-Gu, Suwon 440-746, Korea

Received 5 September 2007
Accepted 15 November 2007

Security in sensor networks is a major issue. Sensor networks use symmetric cryptography protocol since sensor nodes have resource constrained hardware. Such netowrks are also deployed in hostile environments. Therefore, an attacker can get all information after any nodes get compromised. The adversary can inject false sensing reports or false Message Authentication Codes into real reports. A probabilistic voting-based filtering scheme is proposed but in several cases it is inefficient in terms of energy consumption and filtering effectiveness. We proposed a new method that uses a decision function regardless of whether each forwarding node executes a verification process. Through performance analysis and simulation, our result shows that the proposed method is much more efficient than the probabilistic voting-based scheme in many cases.

Compromised node; en-route filtering; security; sensor networks