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Multi-mode encryption and decryption method and device based on voice synchronization and mode transfer

A technology of mode transfer and encryption method, which is applied in the field of communication, can solve the problems of high algorithm complexity and low encryption strength, and achieve the effects of enhancing robustness, high encryption strength, and enhancing diversity

Pending Publication Date: 2022-06-21
SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, commonly used end-to-end voice encryption methods are divided into two categories, one is to experiment voice signal encryption through voice-like modulation, which first compresses and encodes the voice at a low bit rate, and then modulates the compressed and encoded signal , making it a voice-like signal for transmission. This method will have a greater impact on the decrypted voice quality due to low bit rate compression coding, modulation and demodulation, and bit errors in the transmission process, and the algorithm complexity is relatively high.
The other is an analog encryption method, which encrypts the voice signal by scrambling the time domain and frequency domain of the voice information. Compared with the first method, the decrypted voice quality of this method is higher. But it only adopts a single scrambling scheme, and the encryption strength is low

Method used

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  • Multi-mode encryption and decryption method and device based on voice synchronization and mode transfer
  • Multi-mode encryption and decryption method and device based on voice synchronization and mode transfer

Examples

Experimental program
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Effect test

Embodiment 1

[0038] like figure 1 As shown, this embodiment provides a multi-modal encryption method based on voice synchronization and mode transfer, including the following steps:

[0039] S101: obtain the current voice segment to be encrypted;

[0040] S102: adopt the voice endpoint detection algorithm of spectral entropy to judge whether the first frame of the current voice segment to be encrypted is a silent frame, if it is not a silent frame, encrypt through the current encryption mode to obtain the current encrypted voice segment, and set the encrypted silent frame counter to zero at the same time ;

[0041] If it is a silent frame, set the current voice segment to be encrypted to zero, and add one to the encrypted silent frame counter to determine whether the silent frame counter is greater than the threshold. If so, obtain the next voice segment to be encrypted, and switch to the corresponding encryption mode for encryption. , traverse all the speech segments to be encrypted to ...

Embodiment 2

[0075] like figure 2 As shown, this embodiment provides a multi-modal decryption method based on voice synchronization and mode transfer, including the following steps:

[0076] S101: obtain the currently encrypted voice segment;

[0077] S102: the currently encrypted voice segment is decrypted by the current decryption mode to obtain the current decrypted voice segment;

[0078] S103: adopt the voice endpoint detection algorithm of spectral entropy to judge whether the first frame of the current decrypted voice segment is a mute frame, if it is not a mute frame, set the current decrypted voice segment to zero; if the decrypted voice frame is a mute frame, will decrypt the voice frame. Set to zero, at the same time increase the decrypted silence frame counter by one, and determine whether the decrypted silence frame counter is greater than the threshold. If so, obtain the next segment of the voice segment to be decrypted, switch to the corresponding decryption mode for decry...

Embodiment 3

[0086] This embodiment provides a multi-modal encryption device based on voice synchronization and mode transfer, including:

[0087] The to-be-encrypted speech acquisition module is configured to: acquire the current to-be-encrypted speech segment;

[0088] The multi-modal encryption module is configured to: use the voice endpoint detection algorithm of spectral entropy to determine whether the first frame of the current voice segment to be encrypted is a silent frame, and if it is not a silent frame, encrypt through the current encryption mode to obtain the current encrypted voice segment, Also set the encrypted silence frame counter to zero;

[0089] If it is a silent frame, set the current voice segment to be encrypted to zero, and increase the encrypted silence frame counter by one to determine whether the silent frame counter is greater than the threshold. If so, obtain the next voice segment to be encrypted, and switch to the corresponding encryption mode for encryption...

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Abstract

The invention belongs to the technical field of communication, and provides a multi-mode encryption and decryption method and device based on voice synchronization and mode transfer, and the method comprises the steps: carrying out the voice segment detection of an input voice, and employing a one-segment one-pad encryption scheme to achieve higher encryption strength, and at the same time, enhancing the robustness of channel noise and error codes; the average value of the line spectrum frequency parameters of the voice segments is used as the basis of mode selection, so that the diversity of mode selection is enhanced, and compression of various voice compression transmission algorithms can be resisted.

Description

technical field [0001] The invention belongs to the field of communication technology, and in particular relates to a multi-modal encryption and decryption method and device based on voice synchronization and mode transfer. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Voice security is of great significance to the communication, military and other industries. End-to-end voice encryption means that the voice information has completed the encryption process before entering the communication system. The communication process is the process of transmitting encrypted voice. Intrusion, the stolen information is encrypted voice, which ensures the security of voice transmission. [0004] In the prior art, the commonly used end-to-end voice encryption methods are divided into two categories. One is to experiment with voice signal encryption thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L25/87G10L19/00H04L9/40
CPCG10L25/87G10L19/00H04L63/0428
Inventor 李晔冯涛张鹏李姝
Owner SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
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