Improving robustness against the coordinated attack by removing crashed hub nodes in complex network

Recently, several distributed attacks based on local information have been emerged threating network security. The coordinated attack is one of the most destructive attacks, with an important property to identify the next-step target through coordinating all crashed nodes. It has been ignored in most of existing researches that the crashed nodes network size will become larger and larger along with the coordinated attack, which makes the coordinated attack crash each node in the same time virtually impossible. In this work, we propose R.C.H strategy, which removes a fraction of crashed hub nodes to improve network robustness against the coordinated attack. The simulation shows that R.C.H strategy is highly contribute to degrade efficiency of the coordinated attack by means of the larger cluster diameter of the crashed node network, which provides some insights for the future research on enhancing robustness of complex communication networks.