An Audio Based Information Encryption Method and Its Implementation

An audio based information encryption method was proposed along with it's implementation, which hides low rate data into sound by digital modulation of a narrow base band carrier. Because of it's narrow spectrum and robust error control coding and advanced signal detection scheme, data carrier affects the background sound very slightly while encrypted information can be transmitted through variance channels or stored either in digital or analog mode, and restored at the receiver. Experiment result has confirmed the validity of this kind of methed.