A Scheme of Transparent Speech Information Hiding Based on Fractional Fourier Transform

With the rapid development of network and multimedia techniques, speech information hiding has been given extensive attentions. In this paper, a novel scheme of speech information hiding based on the fractional Fourier transform is proposed, which combines the characteristics of fractional Fourier transform and time-frequency masking effect of human auditory system. Theoretical analysis and experimental results show that the proposed scheme improves the security of traditional scheme through mapping a security key to the transforming factor a of fractional Fourier transform. At the same time, the robustness against noise is slightly better than traditional echo hiding scheme.