Digital steganography and digital extraction methods with compressed audio as masking carrier

一种以压缩音频为掩蔽载体的数字隐写及提取方法

Abstract

本发明公开了一种以压缩音频为掩蔽载体的数字隐写及提取方法,在数字隐写方法中,选择音频颗粒数据的窗口形状作为隐写对象,且通过音频颗粒数据的窗口形状的切换实现秘密信息比特位的隐藏,含秘密信息的压缩音频的码流长度与未含秘密信息的压缩音频码流长度不变,从而避免了由于隐写操作导致整个压缩音频的编码比特率增加和文件长度改变等问题,有效保证了秘密信息的安全性;在数字提取方法中,由解码得到的帧信息确定其对应的音频颗粒数据的窗口形状,再根据窗口形状直接获得秘密信息比特位,由于窗口形状可以在解码音频颗粒数据的帧信息时从帧信息中提取得到,因此无需再对音频颗粒数据进行解码,从而有效提高了提取秘密信息过程的实时性。
The invention discloses digital steganography and digital extraction methods with compressed audio as a masking carrier. In a digital steganography method, the window shape of audio particle data is selected to be used as a steganography object and is switched to realize hiding of bits of secret information, and the code stream length of the compressed audio containing the secret information and the code stream length of the compressed audio containing no secret information are constant, thus the problems of code bit rate increment, document length variation and the like of the whole compressed audio due to steganography operation are avoided, and the safety of the secret information is effectively ensured; and in a digital extraction method, the window shape of the audio particle data corresponding to frame information obtained through decoding is determined, then the bits of the secret information are directly obtained according to the window shape, and because the window shape can be obtained through extraction from the frame information when the frame information of the audio particle data is decoded, the audio particle data does not require to be decoded, thus the real-time property of a secret information extraction process is effectively improved.

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Cited By (1)

    Publication numberPublication dateAssigneeTitle
    CN-104867496-AAugust 26, 2015合肥工业大学MDCT quantization coefficient small value region-based advanced audio coding (AAC) audio steganography and extraction method