MDCT quantization coefficient small value region-based advanced audio coding (AAC) audio steganography and extraction method

A technology for quantizing coefficients and audio, applied in the field of information hiding, which can solve the problems of inconvenient communication transmission, inability to meet real-time performance, and low hidden capacity.

Active Publication Date: 2015-08-26
合肥庐阳科技创新集团有限公司
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AI Technical Summary

Problems solved by technology

At present, the research on audio steganography mainly uses uncompressed audio as the carrier, but there are problems in the steganographic method using uncompressed audio as the carrier: the uncompressed audio is large in size, it is not convenient for communication transmission, and it is not available on the network. Uncommon, it is easy to arouse the suspicion of the monitor, thus affecting the security of steganography
[0004] One is the information hiding method based on the time domain, that is, the secret information is embedded in the uncompressed time domain signal and then compressed into AAC format audio. Meet real-time requirements, so this method is currently rarely used in information hiding of compressed domain audio
[0005] T

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  • MDCT quantization coefficient small value region-based advanced audio coding (AAC) audio steganography and extraction method
  • MDCT quantization coefficient small value region-based advanced audio coding (AAC) audio steganography and extraction method
  • MDCT quantization coefficient small value region-based advanced audio coding (AAC) audio steganography and extraction method

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Embodiment Construction

[0042] In this embodiment, an AAC audio steganography method based on the small-value area of ​​the MDCT quantization coefficient is used to compress and encrypt the steganographic information to be transmitted to form secret information, and embed it in the AAC audio; specifically, It is carried out as follows:

[0043] Step 1, according to the 2nd and the 3rd codebook in the AAC audio codebook, establish the mapping table that contains index pair and code length as shown in table 1 and table 2 respectively, index pair is by the index value on the left and the right The index value consists of:

[0044] figure 1 It is an absolute value distribution map of quantized MDCT coefficients of a certain frame of AAC audio, wherein the horizontal axis represents the serial number of MDCT quantized coefficients, and the vertical axis represents the absolute value of MDCT quantized coefficients. fromfigure 1 As can be seen from , the quantization coefficient can be divided into a larg...

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Abstract

The invention discloses an MDCT quantization coefficient small value region-based advanced audio coding (AAC) audio steganography and extraction method. The method includes the following steps that: 1, a mapping table containing index pairs and code length is established according to an AAC audio codebook; steganography rules are established according to the mapping table; and 3, insertion and extraction of secret information can be realized through utilizing the mapping table and the steganography rules. With the method of the invention adopted, computational complexity in steganography and extraction processes can be decreased, and imperceptibility and anti-steganalysis of steganography can be improved, and therefore, information can be hidden in and extracted from AAC audios safely and efficiently.

Description

technical field [0001] The invention belongs to the field of information hiding in information security, and in particular relates to an AAC steganography and extraction method based on a small-value area of ​​MDCT quantization coefficients. Background technique [0002] Steganography is a technology that embeds secret information with a certain algorithm in public digital media, and can use public channels to realize secret communication. At present, the research on audio steganography mainly uses uncompressed audio as the carrier, but there are problems in the steganographic method using uncompressed audio as the carrier: the uncompressed audio is large in size, it is not convenient for communication transmission, and it is not available on the network. Uncommon, it is easy to arouse the suspicion of the monitor, thus affecting the security of steganography. At present, most of the audio on the Internet is stored and transmitted by compression coding represented by MP3. A...

Claims

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Application Information

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IPC IPC(8): G10L19/018
Inventor 王昱洁蒋薇薇翟琰
Owner 合肥庐阳科技创新集团有限公司
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