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A Method of Compressed Domain Audio Digital Extraction Based on Index Value

An extraction method and index value technology, which are applied in speech analysis, instruments, etc., to reduce computational complexity, ensure undetectability and perceptual transparency, and ensure steganographic security.

Active Publication Date: 2017-09-29
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although some digital steganographic methods using compressed domain audio as the masking carrier have appeared, there is still room for improvement in terms of steganographic capacity and undetectability.

Method used

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  • A Method of Compressed Domain Audio Digital Extraction Based on Index Value
  • A Method of Compressed Domain Audio Digital Extraction Based on Index Value
  • A Method of Compressed Domain Audio Digital Extraction Based on Index Value

Examples

Experimental program
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Embodiment 1

[0043] 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.

[0044] 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:

[0045] ① At the digital steganographic end, the uncompressed audio to be processed is regarded as t...

Embodiment 2

[0066] 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:

[0067] 1) The digital extraction terminal receives the compressed audio containing secret information sent by the digital steganography terminal.

[0068] 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.

[0069] 3) Decode the current audio grain, and then extract the index value corresponding to the current audio grain from the decoded side information.

[0070] 4) According to the inde...

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Abstract

The invention discloses a method for extracting audio numbers in compressed domain based on index values. The digital extraction method directly extracts bits of secret information through the index values ​​of audio granules. The extraction process is simple and effective, and because the index values ​​of audio granules can be obtained from It is extracted from the side information of the particles, so there is no need to decode the audio particles, that is, there is no need to go through complex links such as anti-entropy coding, inverse quantization, inverse MDCT transformation, and inverse filtering, which effectively improves the real-time performance of the process of extracting secret information. At the same time, the computational complexity is greatly reduced.

Description

[0001] This application is a divisional application of the original application number 201310025148.6 of the invention patent application. Its application date is January 22, 2013. The title of the invention is "A method for audio digital steganography and extraction based on index value". technical field [0002] The invention relates to a multimedia covert communication security technology, in particular to an index value-based compression domain audio digital extraction method. Background technique [0003] 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/018
Inventor 王让定金超严迪群余先敏郭洪刚
Owner NINGBO UNIV