81. A Low-throughput Wavelet-based Steganography Audio Scheme

A novel method of embedding covert text in an audio signal via the wavelet transform is presented. The two-step steganography approach combines plaintext encryption by a standard cryptosystem   followed by the embedding of the encrypted data in a wav file.
The audio signal is decomposed in twelve levels through a selected discrete wavelet. The stego-key indicates the decomposition level,
the wavelet coefficients, and the decimal positions of coefficients where the secret text will be embedded. This novel stego-tool was fully implemented using MatlabTM, a freeware version of which is available in the Internet.