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Digital information anti-interference soft encrypted method and system based on Turbo code-encode

A technology of digital information and soft encryption, which is applied in the direction of interference to communication, usage of multiple keys/algorithms, secure communication, etc. It can solve the problems of information encryption without considering information noise or electronic attack, etc., and achieve superior error correction performance And the effect of anti-interference ability, good encryption effect and good scrambling effect

Inactive Publication Date: 2005-02-23
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of encryption technology in the existing wireless communication system, it mainly focuses on the encryption of information without considering how to prevent information from being attacked by noise or electronic attacks.

Method used

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  • Digital information anti-interference soft encrypted method and system based on Turbo code-encode
  • Digital information anti-interference soft encrypted method and system based on Turbo code-encode
  • Digital information anti-interference soft encrypted method and system based on Turbo code-encode

Examples

Experimental program
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Embodiment 1

[0060] The general framework of the present invention is as figure 1 As shown in the figure, the digital information source can be a digital voice signal, a digital image signal or a data signal, that is, a series of letters, numbers and symbols representing concepts, commands and other texts or other forms of information. The sender forms an encrypted file with the digital information through the encryption module, and realizes the transmission of the information on the network through the communication interface. After the channel transmission, the receiver realizes the reception of the encrypted data through the communication interface, and then decrypts the information by the decryption module of the receiver. .

[0061] The structure of the encryption module is attached figure 2 shown. It consists of three parts: an external interleaving and scrambling submodule, a Turbo encryptor and a key management software interface submodule. The binary digital information is inp...

Embodiment 2

[0121] The present invention introduces an example of the effect after encrypting a section of voice signal and a digital image, and performs a performance simulation on the effect of encryption.

[0122] 1. Voice signal

[0123] A section of voice signal has been selected in the example of the present invention, and its amplitude sampling is as attached Figure 8 shown.

[0124] The encrypted signal is attached as Figure 9 shown. Figure 9 In the experiment, because the code rate is 1 / 2 in the experiment, the number of sampling points is doubled after Turbo encoding (from 128 to 256); the source encoding adopts PCM quantization encoding; and because the experiment uses BPSK Modulation, so the encoded data values ​​are +1 / -1.

[0125] What needs to be declared is that the original voice signal is not interleaved and scrambled for the voice signal, and the encryption effect after scrambling will be explained in the image information.

[0126] The decrypted signal is attac...

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Abstract

The invention uses software encryption, the interleaver and recursive system code submodule in Turbo coding structure to make up cipher key that can encrypt the information source. Its system consists of an encryption module, an anti-interference decryption module and a cipher management software interface module. The encryption module is composed of the external interleaving scramble submodule, the Turbo encipher and cipher management submodule. Turbo encoder is adopted in the encryption module. The noise and other interference are reduced in the transmission of the encrypted information. The invention can be applied in secret information encryption like military intelligence.

Description

Technical field [0001] The invention relates to a digital information anti-interference soft encryption method and system based on Turbo codec. Background technique [0002] Because Turbo code has superior error correction and anti-interference performance, it is widely used in various technical fields. For example, in wireless communication systems, it is applied to channel estimation and decoding, multi-user detection, Turbo equalization, OFDM (orthogonal frequency division multiplexing) and space-time processing, etc.; in the field of information hiding, it is applied for digital watermarking; Turbo codes are also widely used in deep space communications, satellite communications, optical fiber communications, and multimedia communications, etc. [Reference: Liu Donghua. "Turbo Code Principles and Application Technology", Electronic Industry Press, January 2004] . The application field of Turbo code has not been extended to the application in the field of information sec...

Claims

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Application Information

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IPC IPC(8): H03M13/29H04K1/00H04K3/00H04L9/14
Inventor 肖扬谢玉明
Owner BEIJING JIAOTONG UNIV
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