Data encryption with chaotic Colpitts oscillators via power supply modulation

In this work we present numerical investigations for a simple data modulating technique employing Colpitts electronic oscillator models operating in the chaotic regime. The procedure includes a low amplitude half-wave rectified sinusoidal function on top of power supply terms, which acts as a message embedded data. We show how the suggested method does not take away the transmitter's chaotic dynamics or the unidirectional complete chaotic synchronisation achieved. Advantages are in form of straightforward implementation that does not require hardware modifications as well as information recovery based on a simple subtraction. The proposed methodology can be applied to either positive or negative power supply. Traces of embedded data in the transmitted chaotic carrier cannot be spotted in time or frequency domain. In consequence the proposed method falls in the category of chaotic inclusion or embedding techniques but without requiring complex and computationally expensive left inversion protocols.