CN114142991A - Linear regular domain voice encryption system based on cascade chaotic modulation - Google Patents
Linear regular domain voice encryption system based on cascade chaotic modulation Download PDFInfo
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- CN114142991A CN114142991A CN202111473912.7A CN202111473912A CN114142991A CN 114142991 A CN114142991 A CN 114142991A CN 202111473912 A CN202111473912 A CN 202111473912A CN 114142991 A CN114142991 A CN 114142991A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
Abstract
The invention provides a linear regular domain voice encryption system based on cascade chaotic modulation, and belongs to the technical field of voice communication encryption. The voice signal encryption and decryption device comprises a voice signal acquisition module (1), a linear regular transformation module (2), a cascade chaotic system module (3), a transform domain encryption module (4), a linear regular inverse transformation module (5) and an encrypted voice storage module (6). The chaotic Lyapunov exponent can be improved by arranging the cascade chaotic system module, the key space is enlarged, and the safety performance is improved; the linear regular transformation is subjected to chaotic modulation of the cascaded chaotic system module, and dynamic change acts on the segmented signals, so that the complexity of an encryption algorithm can be increased, the cracking difficulty of the algorithm is improved, and the safety of voice signals is improved.
Description
Technical Field
The invention relates to the technical field of voice communication encryption, in particular to a linear regular domain voice encryption system based on cascade chaotic modulation.
Background
In recent years, communication technology has been rapidly developed, and voice communication in a communication system is one of the most common ways for people to exchange and transmit information. Although there are many researches on the voice encryption method, the cracking technology is continuously developed, and the research on the voice encryption method which is more convenient and faster and has higher security performance is still one of the important contents in the communication security. The secret communication technology based on the chaos theory is an important research direction in the communication security field, and although the chaos encryption method is easy to realize, the attack of selecting a plain (secret) text cannot be resisted.
Encryption of the speech signal may be implemented in the time domain, frequency domain, or time-frequency hybrid domain. The time domain encryption method usually mainly uses scrambling and pure chaotic encryption, is easily attacked by selected plaintext and has low voice security. The frequency domain encryption method is generally to perform scrambling encryption in the frequency domain after performing fourier transform, wavelet transform, cosine transform, etc. on the signal. Such transform domain encryption is usually a fixed transform, and the role of the transform method in the encryption effect has limitations.
Disclosure of Invention
The invention provides a linear regular domain voice encryption system based on cascade chaotic modulation, which utilizes the cascade chaotic system to modulate linear regular transformation parameters and improves the encryption safety performance.
In order to solve the technical problems, the invention adopts the technical scheme that:
a linear regular domain voice encryption system based on cascade chaotic modulation comprises a voice signal acquisition module, a linear regular transformation module, a cascade chaotic system module, a transformation domain encryption module, a linear regular inverse transformation module and an encrypted voice storage module, wherein: the first signal input end of the linear regular transformation module is connected with the signal output end of the voice signal acquisition module, the first signal input end of the transformation domain encryption module is connected with the signal output end of the linear regular transformation module, the first signal input end of the linear regular inverse transformation module is connected with the signal output end of the transformation domain encryption module, the signal input end of the encryption voice storage module is connected with the signal output end of the linear regular inverse transformation module, and the signal output end of the cascade chaotic system module is connected with the second signal input ends of the linear regular transformation module, the transformation domain encryption module and the linear regular inverse transformation module;
the voice signal acquisition module acquires voice signals and transmits the voice signals to the linear regular transformation module; the linear regular transformation module is used for obtaining the random segment length of the signal from the cascade chaotic system module and modulating the random sequence of the linear regular transformation parameter corresponding to each segmented signal, segmenting the voice signal according to the random segment length of the signal, modulating the linear regular transformation parameter corresponding to each segmented signal through each random sequence, performing linear regular transformation on each segmented signal through the linear regular transformation parameter corresponding to each modulated segmented signal, obtaining a linear regular transformation domain spectrum, and transmitting the linear regular transformation domain spectrum to the transformation domain encryption module; the transformation domain encryption module encrypts a linear regular transformation domain spectrum through a random sequence acquired from the cascade chaotic system module and transmits an encrypted transformation domain signal to the linear regular inverse transformation module; the linear regular inverse transformation module modulates linear regular inverse transformation parameters through random sequences obtained from the cascade chaotic system module and carries out linear regular inverse transformation of corresponding parameters on the encrypted transformation domain signals to obtain encrypted time domain voice signals, and the encrypted voice storage module stores the encrypted time domain voice signals.
Optionally, the cascaded chaotic system module is formed by sequentially connecting five chaotic systems, the output of a front chaotic system is used as the input of a rear chaotic system, and the output of the last chaotic system is used as the input of the first chaotic system; the first chaotic system is used for the sectional processing of the voice signal so as to carry out the sectional encryption in the following; the second chaotic system to the fourth chaotic system are used for generating random sequences to respectively modulate three variable parameters of linear regular transformation so as to perform linear regular transformation on the segmented signals under different parameters; and the fifth chaotic system is used for encrypting the linear regular transform domain spectrum.
Optionally, the transform domain encryption module performs an exclusive or operation on the linear regular transform domain spectrum through a random sequence acquired from the cascaded chaotic system module to implement encryption.
Optionally, the linear regular transformation of the linear regular transformation module and the inverse transformation of the linear regular inverse transformation module use discrete methods that are fast algorithms based on basis decomposition.
The invention has the beneficial effects that:
the chaotic Lyapunov exponent can be improved by arranging the cascade chaotic system module, the key space is enlarged, and the safety performance is improved; the linear regular transformation is subjected to chaotic modulation of the cascaded chaotic system module, and dynamic change acts on the segmented signals, so that the complexity of an encryption algorithm can be increased, the cracking difficulty of the algorithm is improved, and the safety of voice signals is improved.
Drawings
FIG. 1 is a schematic diagram of the system components of the present invention.
Fig. 2 is a schematic diagram of a composition structure of the cascaded chaotic system module in fig. 1.
Fig. 3, a and B, are a time-domain waveform diagram and a linear canonical transform domain spectrogram of an original speech signal, respectively.
Fig. 4 a and B are respectively an encrypted linear canonical transform domain spectrogram and a corresponding time domain waveform.
Fig. 5, a and B, are respectively a linear canonical transform domain spectrogram and a time domain waveform of the decrypted speech signal.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the linear regular domain voice encryption system based on the cascaded chaotic modulation in this embodiment includes a voice signal acquisition module 1, a linear regular transformation module 2, a cascaded chaotic system module 3, a transformation domain encryption module 4, a linear regular inverse transformation module 5, and an encrypted voice storage module 6, where: the first signal input end of the linear regular transformation module 2 is connected with the signal output end of the voice signal acquisition module 1, the first signal input end of the transformation domain encryption module 4 is connected with the signal output end of the linear regular transformation module 2, the first signal input end of the linear regular inverse transformation module 5 is connected with the signal output end of the transformation domain encryption module 4, the signal input end of the encryption voice storage module 6 is connected with the signal output end of the linear regular inverse transformation module 5, and the signal output end of the cascade chaotic system module 3 is connected with the second signal input ends of the linear regular transformation module 2, the transformation domain encryption module 4 and the linear regular inverse transformation module 5;
the voice signal acquisition module 1 acquires voice signals and transmits the voice signals to the linear regular transformation module 2; the linear regular transformation module 2 is used for obtaining the random segment length of the signal from the cascade chaotic system module 3 and modulating the random sequence of the linear regular transformation parameter corresponding to each segmented signal, segmenting the voice signal according to the random segment length of the signal, modulating the linear regular transformation parameter corresponding to each segmented signal through each random sequence, performing linear regular transformation on each segmented signal through the linear regular transformation parameter corresponding to each modulated segmented signal, obtaining a linear regular transformation domain spectrum, and transmitting the linear regular transformation domain spectrum to the transformation domain encryption module 4; as shown in fig. 3, a diagram a and a diagram B in fig. 3 are a time domain waveform diagram and a linear canonical transform domain spectrogram of an original speech signal, respectively. The transform domain encryption module 4 encrypts a linear regular transform domain spectrum through a random sequence acquired from the cascade chaotic system module 3, and transmits an encrypted transform domain signal to the linear regular inverse transform module 5; the linear regular inverse transformation module 5 performs linear regular inverse transformation on the encrypted transformation domain signal through the random sequence obtained from the cascade chaotic system module 3 to obtain an encrypted time domain voice signal; fig. 4 a and B are respectively an encrypted linear canonical transform domain spectrogram and a corresponding time domain waveform. The encrypted voice storage module 6 stores the encrypted time-domain voice signal.
For a voice signal receiving end, a cascade chaotic system with the same key space is utilized, and the recovery of an encrypted voice signal can be realized through the reverse process of an encryption process. The linear canonical transform domain spectrogram and the time domain oscillogram of the restored speech signal are respectively shown as a graph and B graph in fig. 5.
Comparing fig. 3 and fig. 4, the encrypted spectrum has the characteristic of relatively uniform distribution, and no longer has the linear regular transform domain spectrum characteristic of the original speech signal. Correspondingly, the waveform of the encrypted time domain voice signal has a larger difference with the waveform of the original signal, the original signal information remained by the encrypted signal is less, a better confidentiality effect can be achieved, and the voice communication safety can be ensured.
Compared with fig. 3 and fig. 5, the restored speech signal has relatively high consistency intuitively in both the time domain and the linear canonical transform domain; objectively, for the recovered voice signal and the original voice signal, the mean square error is calculated to be 6.30e-08, the signal-to-noise ratio is 29.72, and the MOS value in the PESQ method is 2.66, which shows that the method provided by the invention can recover a better voice signal under the condition of correct decryption.
Optionally, as shown in fig. 2, the cascaded chaotic system module 3 is formed by sequentially connecting five chaotic systems, an output of a front chaotic system is used as an input of a rear chaotic system, and an output of a last chaotic system is used as an input of a first chaotic system; the first chaotic system is used for the sectional processing of the voice signal so as to carry out the sectional encryption in the following; the second chaotic system to the fourth chaotic system are used for generating random sequences to respectively modulate three variable parameters of linear regular transformation so as to perform linear regular transformation on the segmented signals under different parameters; and the fifth chaotic system is used for encrypting the linear regular transform domain spectrum. Specifically, the initial value parameters of the cascaded chaotic system module 3 are set through (input tools such as a keyboard) to obtain the random segment length of the signal and the linear regular transformation parameters corresponding to each segmented signal.
Optionally, the transform domain encryption module 4 performs an exclusive or operation on the linear regular transform domain spectrum through the random sequence acquired from the cascaded chaotic system module 3 to implement encryption.
Optionally, the linear regular transformation of the linear regular transformation module 2 and the inverse transformation of the linear regular inverse transformation module 5 use a discrete method which is a fast algorithm based on basis decomposition, which not only approximates to continuous transformation, but also has a display expression, and at the same time, has a computational complexity equal to that of fast fourier transformation, and improves the complexity and security of the encryption and decryption algorithm, and at the same time, uses the least amount of computation, and improves the algorithm efficiency.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (4)
1. The linear regular domain voice encryption system based on cascade chaotic modulation is characterized by comprising a voice signal acquisition module (1), a linear regular transformation module (2), a cascade chaotic system module (3), a transformation domain encryption module (4), a linear regular inverse transformation module (5) and an encrypted voice storage module (6), wherein: a first signal input end of the linear regular transformation module (2) is connected with a signal output end of the voice signal acquisition module (1), a first signal input end of the transformation domain encryption module (4) is connected with a signal output end of the linear regular transformation module (2), a first signal input end of the linear regular inverse transformation module (5) is connected with a signal output end of the transformation domain encryption module (4), a signal input end of the encryption voice storage module (6) is connected with a signal output end of the linear regular inverse transformation module (5), and a signal output end of the cascade chaotic system module (3) is connected with second signal input ends of the linear regular transformation module (2), the transformation domain encryption module (4) and the linear regular inverse transformation module (5);
the voice signal acquisition module (1) acquires voice signals and transmits the voice signals to the linear regular transformation module (2); the linear regular transformation module (2) is used for obtaining the random segment length of the signal from the cascade chaotic system module (3) and modulating the random sequence of the linear regular transformation parameter corresponding to each segment signal, segmenting the voice signal according to the random segment length of the signal, modulating the linear regular transformation parameter corresponding to each segment signal through each random sequence, performing linear regular transformation on each segment signal through the linear regular transformation parameter corresponding to each modulated segment signal, obtaining a linear regular transformation domain spectrum, and transmitting the linear regular transformation domain spectrum to the transformation domain encryption module (4); the transform domain encryption module (4) encrypts a linear regular transform domain spectrum through a random sequence acquired from the cascade chaotic system module (3), and transmits an encrypted transform domain signal to the linear regular inverse transform module (5); the linear regular inverse transformation module (5) modulates linear regular inverse transformation parameters through random sequences obtained from the cascade chaotic system module (3), and carries out linear regular inverse transformation of corresponding parameters on the encrypted transformation domain signals to obtain encrypted time domain voice signals, and the encrypted voice storage module (6) stores the encrypted time domain voice signals.
2. The system according to claim 1, wherein the cascaded chaotic system module (3) is composed of five chaotic systems connected in sequence, the output of a front chaotic system is used as the input of a rear chaotic system, and the output of the last chaotic system is used as the input of the first chaotic system; the first chaotic system is used for the sectional processing of the voice signal so as to carry out the sectional encryption in the following; the second chaotic system to the fourth chaotic system are used for generating random sequences to respectively modulate three variable parameters of linear regular transformation so as to perform linear regular transformation on the segmented signals under different parameters; and the fifth chaotic system is used for encrypting the linear regular transform domain spectrum.
3. The system according to claim 1, wherein the transform domain encryption module (4) encrypts the linear canonical transform domain spectrum by xoring a random sequence obtained from the cascaded chaotic system module (3).
4. The system according to claim 1, characterized in that the linear canonical transform of the linear canonical transform module (2) and the inverse transform of the linear canonical inverse transform module (5) use discrete methods that are fast algorithms based on basis decomposition.
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| US20080063185A1 (en) * | 2006-01-31 | 2008-03-13 | Tansu Alpcan | Symmetric cryptosystem using cascaded chaotic maps |
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