In data encryption, recently commonly used schemes are chaos-based due to their properties of sensitivity to initial conditions, control parameters, and pseudo-randomness. The chaotic crypto-algorithms are appropriate for extensive data encryption for images, audio or videos. In this paper, a novel audio encryption algorithm based on substitution and permutation network is proposed. In this study, Mobius transformation is used as a source to generate strong S-boxes for the substitution network and the Hénon chaotic map that performs pixel-wise permutation as employed for the permutation network. The proposed algorithm is tested several times with different sizes of audio files; the experimental outcomes show that the proposed algorithm has effective complexity and suitable for audio encryption and hence for secure audio communication.

中文翻译：

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通过莫比乌斯变换和 Hénon 映射对数字音频信号进行加密

在数据加密中，最近常用的方案是基于混沌的，因为它们对初始条件、控制参数和伪随机性敏感。混沌加密算法适用于图像、音频或视频的广泛数据加密。本文提出了一种新的基于置换和置换网络的音频加密算法。在这项研究中，莫比乌斯变换被用作为替代网络和 Hénon 混沌图生成强 S 盒的源，该图执行置换网络所采用的逐像素置换。所提出的算法在不同大小的音频文件中进行了多次测试；实验结果表明，所提出的算法具有有效的复杂度，适用于音频加密，因此适用于安全的音频通信。