A key management for non-uniform security environment

Key management is very important for Wireless Sensor Networks´ (WSNs) security. Many key management protocols have been proposed recently. However, most of them assume that the area which nodes monitored is equal security, and the probability of nodes being compromised to be the same for every node. In some application environments(e.g. in battle field), the probability of nodes being compromised in an enemy controlled area is larger than in our controlled area. In this paper, a key management method for such application environment which the security is non-uniform is proposed. The optimization for the tradeoff between storage and calculation overhead for Blom Matrix is taken into account; the secret symmetric matrix is generated by conjugate chaotic sequence, it is easy to implemented in physical circuit and more secure.