무선 센서 네트워크에서의 메모리 공간 삭제를 이용한 선행 코드-검증 기법

Abstract

The authentication in WSN(Wireless Sensor Network) usually means the entity authentication, but owing to the data centric nature of sensor network, much more importance must be put on the authentication(or attestation) for code of sensor nodes. The naive approach to the attestation is for the verifier to compare the previously known memory contents of the target node with the actual memory contents in the target node, but it has a significant drawback. In this paper, we show what the drawback is and propose a countermeasure. This scheme can verify the whole memory space of the target node and provides extremely low probability of malicious code's concealment without depending on accurate timing information unlike SWATT[1]. We provide two modes of this verification method: BS-to-node and node-to-node. The performance estimation in various environments is shown.