Digital audio camouflage and reconstruction method based on segmented sequences

A digital audio and sequence technology, applied to encryption devices with shift registers/memory, serial/continuous modification of data streams, key distribution, and can solve the problem of low visual quality of camouflaged images

Active Publication Date: 2015-08-19
SHAANXI NORMAL UNIV
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Problems solved by technology

But the proposed strategy is the same as the traditional Tangram method, only 8 equidistant transformations, resulting in low visual quality of the camouflage image in the channel

Method used

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  • Digital audio camouflage and reconstruction method based on segmented sequences
  • Digital audio camouflage and reconstruction method based on segmented sequences
  • Digital audio camouflage and reconstruction method based on segmented sequences

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Embodiment

[0168] Taking JAVA jdk1.7.0_09 as the case implementation environment, the implementation of the present invention will be described in detail in conjunction with the accompanying drawings, but not limited to this implementation case, where figure 1 is a fake flow chart, figure 2 is the recovery flow chart.

[0169] Masquerading process:

[0170] Step 1: Select secret audio such as image 3 As shown, it is monophonic 16-bit audio, the sampling frequency is 44100Hz, the waveform data transmission rate is 705kbps, and the total data length is 302400 bytes. Select meaningful audio that has nothing to do with secret audio as public audio, such as Figure 4 As shown, it is mono 16bit audio, the sampling frequency is 44100Hz, the waveform data transmission rate is 705kbps, and the total data length is 302400 bytes;

[0171] Step 2: The secret audio and the public audio are grouped with 8 sampling values, which can be divided into 18,900 small segments in total, and the small seg...

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Abstract

The present invention discloses a digital audio camouflage and reconstruction method based on segmented sequences. The method comprises the steps of taking sub segment sequences obtained by dividing a published audio and a secret audio as a secret sequence and a published sequence, adding random perturbations to the sequences with the same element value, directly carrying out least squares matching on an equidistant transformation sequence obtained by the rotate right of the secret sequence and a corresponding position published sequence, finding a rotate right step length with a minimum residual error and a matched parameter, and thus camouflaging the secret audio as the published audio and further reconstructing the camouflaged audio as the secret audio. The method is easy to realize, since only the corresponding position equidistant transformation sequence matching is carried out, while the encoding time is reduced, the equidistant transformation number is raised, the matching precision is improved, the detail loss and overflow problems brought by the deformation from a smooth block to a complex block and the restoration from the smooth block to a complex texture block can be effectively avoided, and thus the auditory quality of camouflaged and reconstructed audios is improved further.

Description

technical field [0001] The invention belongs to the field of information security and audio technology, and relates to an audio camouflage method, in particular to a segmented sequence-based digital audio camouflage and reconstruction method. Background technique [0002] In recent years, with the development of computer and network technology, more and more digital audio is transmitted in public channels. Unrestricted access to and use of secret audio not only involves personal privacy, media credibility, and government integrity, but also leads to social unrest and military conflicts. [0003] How to effectively protect the secret audio transmitted in the public channel has become a research hotspot at present. To address this problem, various audio protection methods have been proposed. Compared with digital audio encryption technology, digital audio camouflage is to disguise confidential audio as meaningful non-confidential audio, so that it is difficult to attract the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04L9/06
CPCH04L9/065
Inventor 邵利平谢贤文李苑梦
Owner SHAANXI NORMAL UNIV
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