Information theoretically secure, enhanced Johnson noise based key distribution over the smart grid with switched filters

We introduce a protocol with a reconfigurable filter system to create non-overlapping single loops in the smart power grid for the realization of the Kirchhoff-Law-Johnson-(like)-Noise secure key distribution system. The protocol is valid for one-dimensional grids (chain-like power line). The speed of the protocol (the number of steps needed) versus grid size is analyzed. When fully developed such system has the potential to achieve unconditionally secure key distribution over the smart power grid of arbitrary dimensions.