Adaptive Audio Steganography Scheme Based on Wavelet Packet Energy

This paper proposes an adaptive audio steganography scheme based on wavelet packet energy which can be used to hide secret messages in digital audio. The major contribution of the proposed scheme is that the wavelet packet sub-bands of the host audio can be selected adaptively to embed the secret messages according to the masking effect of human auditory system (HAS) and weighted energy concentration . First, the host audio is divided into many segments which are then decomposed by wavelet packet to calculate the wavelet packet energy feature. Second, the covert data are embedded into each segment through adjusting the relationship among wavelet packet sub-bands by modifying or exchanging the coefficients of wavelet packet sub-bands. Finally, the experimental results and comparison with existing technique show that the proposed scheme has larger hiding capacity while maintaining imperceptibility and strong robustness.