A method includes generating, by a transmit digital to analog circuit of a low voltage drive circuit (LVDC), analog outbound data. The analog outbound data includes a direct current (DC) component and an oscillating component at a first frequency. The method further includes generating, by an analog transmit encryption signal generator of a transmit encrypt module of the LVDC, an analog transmit encryption signal having at least one frequency component, multiplying, by a mixer of the transmit encrypt module, the analog outbound data with the analog transmit encryption signal to produce an encrypted transmit signal having frequency components that differ from the first frequency. The method further includes generating, by a power source circuit of a drive-sense circuit of the LVDC, the encrypted analog outbound data as an analog transmit signal of a bus signal based on analog inbound data.