Audio steganography is the process of hiding a message inside an audio container. This study aims to present a systematic review of audio steganography methods. Existing reviews of audio steganography suffer from a high overlap or a low segregation level among the methods reviewed due to poor classification criteria. These articles are also lacking in terms of depth of analysis and the number of articles reviewed. The data collection method includes surveying five databases, namely, Web of Science, IEEE Explore, ScienceDirect, Scopus, and Springer, resulting in a total of 134 articles. The review focuses on the embedding process of each method. The methods can be classified into several categories based on the most prominent idea in the embedding process; hence, a new classification is proposed. The proposed classification provides a scope for summarizing and understanding the most followed approaches in audio steganography. This study then critically reviews the strengths and weaknesses of each method on the basis of its embedding behavior. Other issues on the domain of embedding, carrier types, and evaluation environments are also discussed.

音频隐秘术是将消息隐藏在音频容器内的过程。这项研究旨在提出音频隐写术方法的系统综述。由于分类标准不佳，音频隐匿术的现有评论在所审查的方法中存在较高的重叠或较低的隔离度。这些文章在分析的深度和评论的数量方面也缺乏。数据收集方法包括调查五个数据库，即Web of Science，IEEE Explore，ScienceDirect，Scopus和Springer，总共有134篇文章。本文重点介绍了每种方法的嵌入过程。根据嵌入过程中最突出的想法，可以将这些方法分为几类。因此，提出了一种新的分类方法。拟议的分类为总结和理解音频隐秘术中最常用的方法提供了一个范围。然后，本研究根据其嵌入行为对每个方法的优缺点进行了严格的审查。还讨论了有关嵌入，载体类型和评估环境的其他问题。