The expansion of key infection model for dynamic sensor network

The establishment of shared cryptography keys is one of the challenging problems in the sensor networks. Key infection (R. Anderson et al., 2004) is a promising model to solve this problem without complex mechanism on the commodity sensor networks. This model, however, does not consider the mobility of sensor, so it can not support dynamic sensor network fields. Therefore, key infection model has to be extended to handle the mobility of sensor, and then an extended key infection model can be used on the dynamic sensor network. In this paper, we propose a scheme to extend the key infection model for supporting dynamic sensor networks and explain how the proposed scheme is operated in detail. Also we prove that the proposed scheme is secure.