Research on key management scheme for WSN based on elliptic curve cryptosystem

Wireless Sensor Network has been applied in many areas successfully. Because it is often deployed in special areas or remote areas, the nodes are captured easily. Therefore, the security of WSN has become present research focus. Key management is the foundation and core of the WSN security. Aiming at the character that WSN has no incredible nodes, we propose a feasible key management scheme based on clustering model. In this scheme, we introduce elliptic curve cryptosystem and identity-based authentication mechanism. Because of the difficulty of solving the elliptic curve discrete logarithm problem, our scheme improves the capacity of anticapture. Moreover, our scheme has WSN nodes updating mechanism. When the nodes are added or revoked from WSN, our scheme is still effective. Compared with some classical schemes, E-G and q-composite scheme, our scheme can make any two nodes communicate with each other secretly, support dynamic network topology and meet the requirements of forward and backward secrecy. Furthermore, the computational complexity and energy cost of the scheme are feasible.