Concealing–restoring system for physical layer data: Based on stochastic filtering theory

We propose a nonlinear concealing–restoring system (CRS) set on the data link layer of the open-systems-interconnection (OSI) reference model to secure the data on physical layer. CRS conceals those data by disturbing them with some random noises, and restores the data from the concealed ones to the original ones by the noise elimination based on a proper stochastic filtering theory.