In recent years, the reversible data hiding (RDH) based on dual stego cover is developing rapidly because of its high capacity and low distortion. For image case, however, two consecutive images of the same image will draw the attention of adversaries during transmission. In this paper, we propose a high-capacity RDH scheme using dual-channel audio, by exploiting the natural dual-channel property of the stereo audio. Specifically, we first convert secret message into novenary digits, which could increase the embedding capacity. Then, the magic matrix is used to embed the secret digit into a single-channel audio to generate two single-channel stego-audio. Finally, the two single-channel stego-audio is combined as a convention dual-channel audio. Extensive experiments have demonstrated that our proposed method could significantly boost the stego quality (the SNR is improved by 16% on average), when comparing with the state-of-the-art methods.

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