Novel Reversible Acoustic Steganography Based on Carrier Orthogonality

A well-known technology called steganography is a strategy of hiding secrets that nobody will suspect the existence of secrets in cover medium. This paper indicates a novel and reversible steganographic protocol based on transformation of secrets to be transmitted covertly in high-frequencies waves carried by a public audio. In principle: a secret is first turned into a digital wave, and then lifted to a radio frequency. The radio-frequency signal is out of the threshold corresponding to human beings’ awareness and will be put onto an audio that could be downloaded by receivers legally. A receiver can lift down the radio-frequency wave and drain out the secret. The proposed technology decreases the risk greatly about preventing secrets from explosion during a transition. Experiments, comparisons and analyses are also performed to investigate practicability and superior performance compared with state-of-the-art steganographic schemes.