Abstract: Recent advances in ambient, FM backscatter radio showed the feasibility of piggybacking an audio signal on top of a broadcast FM radio transmission. In conjunction with the weak transmission power inherent in backscatter radio systems, this work exploits FM ambient backscatter to achieve covert communication. Information in the form of plain text is converted to a wideband audio signal using Direct Sequence Spread Spectrum (DSSS) modulation, resulting in a noise-like audio signal undergoing Frequency Modulation (FM) before being backscattered to a conventional smart phone equipped with FM radio, acting as the receiver. A Linear Feedback Shift Register (LFSR), provided with a key completely determining its output, generates the pseudo-random symbol sequences that serve as spreading sequences in DSSS, thus adding a Private-Key Encryption layer to enhance the cryptosystem's robustness. A Repetition Code is utilized as a way of error correction to increase the performance. Besides simulations, a prototype was implemented to verify the feasibility of the proposed concept.