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Audio digital steganography and extraction method in compressed domain based on index values

A technology of index value and compressed domain, which is applied in speech analysis, instruments, etc., to achieve the effect of ensuring the security of steganography, improving real-time performance, and reducing computational complexity

Inactive Publication Date: 2013-05-15
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although some digital steganographic methods using compressed domain audio as a masking carrier have appeared, there is still room for improvement in terms of steganographic capacity and undetectability.

Method used

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  • Audio digital steganography and extraction method in compressed domain based on index values
  • Audio digital steganography and extraction method in compressed domain based on index values
  • Audio digital steganography and extraction method in compressed domain based on index values

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In the MP3 compressed-domain audio coding process, there is some flexibility in the number of bits (indicated by the index value) required to encode the scale factors of the two sets of scale factor bands for each audio granule, so that secret Steganography of information. figure 1 It is a standard process of compressed domain audio compression coding. After processing an audio granular data of uncompressed audio through a filter bank, it undergoes modified discrete cosine transform, and the index value is determined before quantization and entropy coding.

[0043] This example is in figure 1 On the basis of the compression domain audio compression coding standard process shown, a compression domain audio digital steganography method based on the index value is proposed, and its flow chart is as follows figure 2 As shown, it specifically includes the following steps:

[0044] ① At the digital steganographic end, the uncompressed audio to be processed is regarded as t...

Embodiment 2

[0065] This embodiment aims at an index value-based steganography method for compressed domain audio numbers proposed in Embodiment 1, and at the same time proposes an index value-based compression domain audio number extraction method, the flow chart of which is as follows Figure 4 As shown, it specifically includes the following steps:

[0066] 1) The digital extraction terminal receives the compressed audio containing secret information sent by the digital steganography terminal.

[0067] 2) At the digital extraction end, the compressed audio containing secret information is decoded in units of audio granules, an audio granule to be processed is taken out from the compressed audio containing secret information, and the audio granule to be processed is used as the current audio particles.

[0068] 3) Decode the current audio grain, and then extract the index value corresponding to the current audio grain from the decoded side information.

[0069] 4) According to the inde...

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Abstract

The invention discloses an audio digital steganography and extraction method in a compressed domain based on index values. A steganography operation of the digital steganography method is carried out in the processes of quantization and entropy encoding, so distortion caused by steganography can be controlled effectively with the help of a distortion adjustment mechanism, therefore, steganography safety of secret information is guaranteed effectively, and undetectability and transparency of the secret information are guaranteed. By means of the audio digital extraction method, bits of the secret information are extracted directly through index values of audio particles, and the extraction process is simple and effective. Due to the fact that the index values of the audio particles can be extracted from side information of the audio particles, the audio particles need not to be decoded, namely, such complex procedures as anti-entropy decoding, inverse quantization, inverse modified discrete cosine transform (MDCT) and inverse filtering, and thus timeliness of secret information extraction is improved effectively and computation complexity is reduced greatly.

Description

technical field [0001] The invention relates to a multimedia covert communication security technology, in particular to a compression domain audio digital steganography and extraction method based on an index value. Background technique [0002] With the rapid development of multimedia technology and Internet technology, multimedia communication has become an important means for people to exchange information, and information security and confidentiality are becoming more and more important. Digital steganography is one of the important topics in the field of information security at present. It uses digital multimedia as a masking carrier, embeds the secret information to be sent into the carrier, and transmits it through an open channel in a way that does not attract the attention of the outside world. [0003] From the requirements of steganographic technology on the masking carrier, compressed domain audio such as MPEG-1 Layer III (hereinafter referred to as MP3) is a kin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/018
Inventor 王让定严迪群余先敏金超郭洪刚
Owner NINGBO UNIV