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A novel code attestation scheme against Sybil Attack in Wireless Sensor Networks

Wireless Sensor Networks (WSN) due to their distributed nature are vulnerable to various external and insider attacks. Classic cryptographic measures do protect against external attacks to some extent but they fail to defend against insider attacks involving node compromise. A compromised node can be used to launch various attacks of which Sybil Attack is the most prominent. In this paper we carryout a detailed review and analysis of various defenses proposed against Sybil Attack. We identify their strengths and weaknesses and also propose a novel One Way Code Attestation Protocol (OWCAP) for wireless sensors networks, which is an economical and a secure code attestation scheme that protects not only against Sybil Attack but also against majority of the insider attacks.