Wireless charger capture for electro magnetic radiation attack

Wireless Power Transmission (WPT) has been widely used to replenish energy for various rechargeable devices. The ElectroMagnetic Radiation (EMR) of WPT has attracted great attention of safety concerns. It is possible for the malicious attacker to launch the EMR attack by capturing multiple wireless chargers. Little work has studied the EMR attack itself. In this paper, we propose a realistic EMR hazard model, which outputs the diminishing marginal hazard with EMR, with adjustable parameters to the target entities. We formulate three EMR attack models, termed Cumulative EMR Attack (CEA), Overall EMR Attack (OEA) and Unsafety EMR Attack (UEA), and propose the performance guaranteed algorithm of EMR attack for each model. We conduct extensive simulations and field experiments on a testbed. The results show that the proposed algorithms can output the near-optimal solution with much less running time than the optimal algorithms. The results of field experiments in a small testbed show that the utilities of CEAA and OEAA are increased by 70.5% and 12.9% than the comparison algorithms, respectively. Moreover, the number of captured chargers of UEAA is 5.9% less than the comparison algorithms. Our simulations also show the designed algorithms can perform better in a large-scale charging network.