CN113179149B - Secret optical communication system based on double-chaos phase encoding encryption - Google Patents
Secret optical communication system based on double-chaos phase encoding encryption Download PDFInfo
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- 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
Abstract
The invention discloses a secret optical communication system based on double-chaotic phase coding encryption, which realizes high-speed and safe secret transmission of secret information through an internal and external two-stage optical chaotic system. On an optical-electrical feedback chaotic synchronization system based on a Mach-Zehnder modulator structure, a nonlinear phase-intensity conversion is formed at a sending end and a receiving end by using a phase modulator and a dispersion component which are driven by outer-level optical chaos, secondary disturbance is realized on chaotic signals in a feedback loop, a phase coding encryption system is formed, and the problem that the chaotic signals cannot be directly stolen and cracked in transmission is solved. The key parameters of the phase modulator and the dispersion component introduced by the system become key parameters for determining the synchronization quality of the chaotic system, and the introduction of the key parameters greatly expands the security key space of the system, so that the security of the system is enhanced, the difficulty of breaking by an eavesdropper is further increased, and the security of secret communication is improved.
Description
Technical Field
The invention relates to the technical field of chaotic secure communication, in particular to a secure optical communication system based on double chaotic phase coding encryption.
Background
The chaotic secure communication uses a highly random noise-like optical chaotic signal as a carrier or an encryption device driving signal to realize encryption of transmission information on a physical layer, and a legal receiving end generates a highly similar chaotic optical signal in a chaotic synchronization mode so as to extract the secure information. The chaotic secure communication has the advantages of high transmission rate, long distance, high reliability and the like, and is easily compatible with the current optical communication system. The chaotic communication achieves the synchronization of chaotic signals by using lasers with highly similar structures and working parameters and a symmetrical system structure at the transmitting end and the receiving end, and the synchronization effect influences the correct recovery degree of secret information. Therefore, in the chaotic communication system, the security of key parameter information, the increase of transmission bandwidth, and the stability of the synchronous system have been the focus of research.
Key parameter information such as structural parameters and working parameters of the laser, feedback time delay of the chaotic system and the like jointly form a group of key space. When the eavesdropper does not know specific parameters, blind selection can be performed only in an 'exhaustive' manner, and secret information cannot be extracted correctly under the condition that correct parameters are not found to achieve chaotic synchronization. The key space is made sufficiently large to ensure the security of the communication system. However, many studies show that feedback delay information is exposed when the output intensity and the phase of the chaotic output signal are subjected to autocorrelation and mutual information calculation, and the output spectrum of the chaotic output signal also shows the modulation of the inverse of the delay magnitude on the relaxation oscillation frequency. The key information can be obtained by the eavesdropper through the method, so that the size of the key space is greatly reduced, and the safety information of the communication system is seriously threatened. Aiming at the problem, many scholars conduct research on hiding the time delay information, some researches fail to realize hiding the time delay information on output intensity, phase and frequency spectrum, and some researches weaken the time delay information, greatly increase complexity of a system and reduce synchronization quality of the system. Therefore, the key of research is to ensure the robustness of the chaotic system while effectively ensuring the elimination of the time delay information. In addition, two ways are available for realizing higher-speed chaotic communication, one is to study through a modulation mode, and load more information in a limited bandwidth through a high-order modulation or other leading-edge modulation modes, but many of them have the problem of low information recovery quality. Secondly, the chaotic bandwidth is expanded to meet the requirement of bearing a higher-speed signal, a great deal of research of broad scholars is carried out in this direction, various modes for expanding the chaotic bandwidth are generated, but a lot of research increases the complexity of the system structure while expanding the bandwidth, is difficult to be compatible with the current optical communication system, and improves the commercial cost of chaotic secret communication.
In the prior art, a chinese invention patent with publication number CN111245595a discloses an optical secret communication system based on chaotic random key distribution in 5.6.2020, a chaotic synchronization key distribution module in a transmitting end extracts a true random key from a chaotic signal and uses the true random key to drive an optical coding secret communication module to work, the optical coding secret communication module performs optical coding on secret data to be transmitted to convert the secret data into a secret communication signal, and a wavelength division multiplexer multiplexes the chaotic signal and the secret communication signal and transmits the secret communication signal to a receiving end through a transmission optical fiber; the wavelength division multiplexing demultiplexer in the receiving end demultiplexes the received multiplexing signal to obtain a chaotic signal and a secret communication signal, the chaotic synchronization key receiving module enables the chaotic synchronization key to be matched with a parameter corresponding to the transmitting end by adjusting the parameter, chaotic synchronization of the receiving end and the transmitting end is achieved, a true random key is obtained and used for driving the optical decoding secret communication module to work, and the optical decoding secret communication module decodes the received time domain random noise signal to obtain original secret data. The scheme does not realize double-double chaos confidentiality.
Disclosure of Invention
The invention provides a secret optical communication system based on double chaotic phase coding encryption, aiming at overcoming the defect of low security of the existing secret communication system.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
a secret optical communication system based on double chaotic phase coding encryption comprises: a sending end and a receiving end;
the transmitting end comprises: the optical feedback chaos unit comprises an optical feedback chaos unit, a first coupler, a first photoelectric detector, a first phase modulator, a first dispersion part, a first adjustable gain, a second photoelectric detector, a second CW laser, a first Mach-Zehnder modulator, an intensity modulator, a second coupler and a wavelength division multiplexer, wherein the output end of the optical feedback chaos unit is connected to the input end of the first coupler, the first output end of the first coupler is connected to the input end of the wavelength division multiplexer, the second output end of the coupler is connected to the input end of the first photoelectric detector, the output end of the first photoelectric detector is connected to the first input end of the first phase modulator, the first output end of the first phase modulator is connected to the input end of the first dispersion part, the output end of the first dispersion part is connected to the input end of a second photoelectric detector, the output end of the second photoelectric detector is connected to the input end of a second adjustable gain, the output end of the second adjustable gain is connected to the first input end of a first Mach-Zehnder modulator, the output end of a second CW laser is connected to the second input end of the first Mach-Zehnder modulator, the output end of the first Mach-Zehnder modulator is connected to the input end of an intensity modulator, the output end of the intensity modulator is connected to the input end of a second coupler, the first output end of the second coupler is connected to the input end of a wavelength division multiplexer, and the second output end of the second coupler is connected to the second input end of a first phase modulator;
the receiving end includes: the third photoelectric detector, the wavelength division demultiplexer, the second phase modulator, the second dispersive component, the fourth photoelectric detector, the second adjustable gain, the third CW laser, the second Mach-Zehnder modulator, and the third coupler have the following specific connection relations: the output end of the wavelength division multiplexer at the sending end is connected to the input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is respectively connected to the input end of a third photoelectric detector and the input end of a third coupler, the output end of the third photoelectric detector and the first output end of the third coupler are both connected to the input end of a second phase modulator, the output end of the second phase modulator is connected to the input end of a second dispersion component, the output end of the second dispersion component is connected to the input end of a fourth photoelectric detector, the output end of the fourth photoelectric detector is connected to the input end of a second adjustable gain, the output end of the second adjustable gain is connected to the first input end of a second Mach-Zehnder modulator, the output end of a third CW laser is connected to the second input end of the second Mach-Zehnder modulator, and the output ends of the second Zehnder modulator and the third coupler are both connected to the input end of a subtraction unit.
Further, the optical feedback chaotic unit comprises a reflector and a first CW laser, and the specific connection relationship is as follows: the output of the mirror is connected to the input of a first CW laser, the output of which is connected to the input of a first coupler.
Further, the optical chaotic signal output by the optical feedback chaotic unit is an external optical chaotic signal.
Further, the two optical chaotic signals output by the first coupler are the same.
Further, an optical chaotic signal sent by the optical feedback chaotic unit at the sending end is sent to the first phase modulator through the first coupler and the first photoelectric detector to be used as a driving key.
Furthermore, the first adjustable gain, the second photoelectric detector, the second CW laser and the first mach-zehnder modulator constitute a transmitting-end photoelectric feedback loop chaotic unit.
Further, the chaotic signal received by the receiving end is sent to a third photoelectric detector after being subjected to wavelength division multiplexing, and is sent to a second phase modulator as a driving secret key through the third photoelectric detector.
Furthermore, the first phase modulator introduces a new phase-frequency component into a loop of the photoelectric feedback loop chaotic unit, and then completes nonlinear conversion from phase change to intensity change through the first dispersion component, so that secondary disturbance is performed on the optical chaotic signal, and phase encoding encryption is realized.
Further, the optical chaotic signal after the phase coding encryption is sent to the intensity modulator through the photoelectric feedback loop chaotic unit, the intensity modulator modulates the secret information to be sent to the chaotic carrier wave in a chaotic modulation mode, and then the optical chaotic signal is sent to the receiving side through the second coupler and the wavelength division multiplexer together with the optical chaotic signal output by the first coupler.
Furthermore, the second phase modulator, the second dispersive component, the fourth photoelectric detector, the second adjustable gain, the third CW laser and the second mach-zehnder modulator together form a receiving-end chaotic synchronization system, the receiving-end chaotic synchronization system performs nonlinear phase-intensity conversion on the optical chaotic signal output by the first output end of the third coupler, chaotic synchronization is completed under the set parameter condition, meanwhile, the optical chaotic signal and the chaotic synchronization signal after wavelength division multiplexing demodulation output by the second output end of the third coupler are input to a subtraction demodulation unit, and subtraction demodulation is performed to obtain confidential information.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the phase modulator and the dispersion component are introduced into the sending end and the receiving end to form a phase coding encryption system, the nonlinear phase-intensity conversion characteristic of the phase modulator and the dispersion component is utilized to realize secondary scrambling encryption of the chaotic synchronization system, when an eavesdropper cannot know the driving keys and device parameters of the key components such as the phase modulator and the dispersion component, the same secondary conversion cannot be carried out on the obtained inner-level optical chaotic signal, so that chaotic synchronization cannot be realized and secret information can be stolen, the photoelectric feedback loop chaotic unit completes the generation and remote distribution of the driving keys of the phase modulator, the phase modulator has truly random physical characteristics, the eavesdropper can hardly decode the chaotic signal by means such as an algorithm, and the safety of the system is further improved.
Drawings
Fig. 1 is a block diagram of a secure optical communication system based on dual chaotic phase encoding encryption according to the present invention.
Fig. 2 is a schematic block diagram of an optical feedback chaotic unit according to the present invention.
Fig. 3 is a schematic block diagram of an opto-electronic feedback loop chaotic unit according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, a secure optical communication system based on dual chaotic phase encoded encryption comprises: a sending end and a receiving end;
the transmitting end comprises: the optical feedback chaos unit comprises an optical feedback chaos unit, a first coupler, a first photoelectric detector, a first phase modulator, a first dispersion part, a first adjustable gain, a second photoelectric detector, a second CW laser, a first Mach-Zehnder modulator, an intensity modulator, a second coupler and a wavelength division multiplexer, wherein the output end of the optical feedback chaos unit is connected to the input end of the first coupler, the first output end of the first coupler is connected to the input end of the wavelength division multiplexer, the second output end of the coupler is connected to the input end of the first photoelectric detector, the output end of the first photoelectric detector is connected to the first input end of the first phase modulator, the first output end of the first phase modulator is connected to the input end of the first dispersion part, the output end of the first dispersion part is connected to the input end of a second photoelectric detector, the output end of the second photoelectric detector is connected to the input end of a second adjustable gain, the output end of the second adjustable gain is connected to the first input end of a first Mach-Zehnder modulator, the output end of a second CW laser is connected to the second input end of the first Mach-Zehnder modulator, the output end of the first Mach-Zehnder modulator is connected to the input end of an intensity modulator, the output end of the intensity modulator is connected to the input end of a second coupler, the first output end of the second coupler is connected to the input end of a wavelength division multiplexer, and the second output end of the second coupler is connected to the second input end of a first phase modulator;
the receiving end includes: the third photoelectric detector, the wavelength division demultiplexer, the second phase modulator, the second dispersive component, the fourth photoelectric detector, the second adjustable gain, the third CW laser, the second Mach-Zehnder modulator, and the third coupler have the following specific connection relations: the output end of the wavelength division multiplexer at the sending end is connected to the input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is respectively connected to the input end of a third photoelectric detector and the input end of a third coupler, the output end of the third photoelectric detector and the first output end of the third coupler are both connected to the input end of a second phase modulator, the output end of the second phase modulator is connected to the input end of a second dispersion component, the output end of the second dispersion component is connected to the input end of a fourth photoelectric detector, the output end of the fourth photoelectric detector is connected to the input end of a second adjustable gain, the output end of the second adjustable gain is connected to the first input end of a second Mach-Zehnder modulator, the output end of a third CW laser is connected to the second input end of the second Mach-Zehnder modulator, and the output ends of the second Zehnder modulator and the third coupler are both connected to the input end of a subtraction unit.
It should be noted that, in the present invention, the optical feedback chaotic unit is used as an outer-stage optical feedback chaotic unit of the transmitting end, the first adjustable gain, the second photodetector, the second CW laser, and the first mach-zehnder modulator constitute a transmitting-end photoelectric feedback loop chaotic unit (as shown in fig. 3), the photoelectric feedback loop chaotic unit is used as an inner-stage optical chaotic unit of the transmitting end, as shown in fig. 2, the optical feedback chaotic unit includes a mirror and a first CW laser, and the specific connection relationship is as follows: the output of the mirror is connected to the input of a first CW laser, the output of which is connected to the input of a first coupler. The optical chaotic signal output by the optical feedback chaotic unit is an external optical chaotic signal.
It should be noted that the two optical chaotic signals output by the first coupler are the same.
In a specific embodiment, an optical signal output by a first CW laser is fed back to the first CW laser through a reflector under appropriate time delay and intensity to form an optical chaotic signal, the optical chaotic signal is input to a first coupler, the output of the first coupler is divided into two paths, one path is sent to a first phase modulator through a first photoelectric detector to serve as a driving key of the first phase modulator, and the other path is sent to a wavelength division multiplexer and a modulated optical chaotic signal output by a second coupler and sent to a receiving end;
in the internal-level optical chaos, a chaotic signal is formed by utilizing the nonlinear modulation characteristic of a first Mach-Zehnder modulator and under a proper feedback intensity, compared with an optical chaotic signal formed by the traditional optical feedback, the chaotic signal realized by the method has the characteristics of large bandwidth, flat power spectrum and the like, and is more favorable for realizing high-speed chaotic communication.
The chaotic signal received by the receiving end is sent to a third photoelectric detector after wavelength division multiplexing is removed, and the chaotic signal is sent to a second phase modulator as a driving secret key through the third photoelectric detector. Furthermore, the second phase modulator, the second dispersive component, the fourth photodetector, the second adjustable gain, the third CW laser and the second mach-zehnder modulator jointly form a receiving-end chaotic synchronization system, the receiving-end chaotic synchronization system performs nonlinear phase-intensity conversion on the optical chaotic signal output by the first output end of the third coupler, chaotic synchronization is completed under the set parameter condition, meanwhile, the optical chaotic signal subjected to wavelength division multiplexing removal and the chaotic synchronization signal output by the second output end of the third coupler are input to a subtraction demodulation unit, and subtraction demodulation is performed to obtain confidential information.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A secure optical communication system based on double chaotic phase coding encryption is characterized by comprising: a sending end and a receiving end;
the transmitting end comprises: the optical feedback chaos unit comprises an optical feedback chaos unit, a first coupler, a first photoelectric detector, a first phase modulator, a first dispersion part, a first adjustable gain, a second photoelectric detector, a second CW laser, a first Mach-Zehnder modulator, an intensity modulator, a second coupler and a wavelength division multiplexer, wherein the output end of the optical feedback chaos unit is connected to the input end of the first coupler, the first output end of the first coupler is connected to the input end of the wavelength division multiplexer, the second output end of the first coupler is connected to the input end of the first photoelectric detector, the output end of the first photoelectric detector is connected to the first input end of the first phase modulator, the first output end of the first phase modulator is connected to the input end of the first dispersion part, the output end of the first dispersion part is connected to the input end of a second photoelectric detector, the output end of the second photoelectric detector is connected to the input end of a second adjustable gain, the output end of the second adjustable gain is connected to the first input end of a first Mach-Zehnder modulator, the output end of a second CW laser is connected to the second input end of the first Mach-Zehnder modulator, the output end of the first Mach-Zehnder modulator is connected to the input end of an intensity modulator, the output end of the intensity modulator is connected to the input end of a second coupler, the first output end of the second coupler is connected to the input end of a wavelength division multiplexer, and the second output end of the second coupler is connected to the second input end of a first phase modulator;
the receiving end includes: the third photoelectric detector, the wavelength division demultiplexer, the second phase modulator, the second dispersive component, the fourth photoelectric detector, the second adjustable gain, the third CW laser, the second Mach-Zehnder modulator, and the third coupler have the following specific connection relations: the output end of the wavelength division multiplexer at the sending end is connected to the input end of a wavelength division multiplexer, the output end of the wavelength division multiplexer is respectively connected to the input end of a third photoelectric detector and the input end of a third coupler, the output end of the third photoelectric detector and the first output end of the third coupler are both connected to the input end of a second phase modulator, the output end of the second phase modulator is connected to the input end of a second dispersion component, the output end of the second dispersion component is connected to the input end of a fourth photoelectric detector, the output end of the fourth photoelectric detector is connected to the input end of a second adjustable gain, the output end of the second adjustable gain is connected to the first input end of a second Mach-Zehnder modulator, the output end of a third CW laser is connected to the second input end of the second Mach-Zehnder modulator, and the second output end of the second Mach-Zehnder modulator and the second output end of the third coupler are both connected to the input end of a subtraction demodulation unit; the optical chaotic signal output by the optical feedback chaotic unit is an external optical chaotic signal; the first adjustable gain, the second photoelectric detector, the second CW laser and the first Mach-Zehnder modulator form a transmitting end photoelectric feedback loop chaotic unit.
2. A secret optical communication system based on double chaotic phase coding encryption according to claim 1, wherein the optical feedback chaotic unit comprises a reflector and a first CW laser, and the specific connection relationship is as follows: the output of the mirror is connected to the input of a first CW laser, the output of which is connected to the input of a first coupler.
3. A secret optical communication system based on double chaotic phase coding encryption according to claim 1, characterized in that the two optical chaotic signals output by the first coupler are the same.
4. A secret optical communication system based on double chaotic phase coding encryption according to claim 1, characterized in that the optical chaotic signal sent by the optical feedback chaotic unit at the sending end is sent to the first phase modulator as a driving key through the first coupler and the first photodetector.
5. The secret optical communication system based on the double-chaotic phase coding encryption as claimed in claim 1, wherein the chaotic signal received by the receiving end is sent to a third photoelectric detector after being subjected to wavelength division multiplexing, and is sent to a second phase modulator as a driving key through the third photoelectric detector.
6. The secret optical communication system based on the double-chaotic phase coding encryption as claimed in claim 1, wherein the first phase modulator introduces a new phase-frequency component in a loop of the photoelectric feedback loop chaotic unit, and then completes nonlinear transformation from phase change to intensity change through the first dispersion component, thereby performing secondary scrambling on the optical chaotic signal and realizing the phase coding encryption.
7. The secret optical communication system based on the double-chaotic phase coding encryption as claimed in claim 6, wherein the optical chaotic signal after the phase coding encryption is sent to the intensity modulator through the chaotic unit of the photoelectric feedback loop, the intensity modulator modulates the secret information to be sent to the chaotic carrier wave in a chaotic modulation mode, and then the secret information is sent to the receiving party through the second coupler and the wavelength division multiplexer together with the optical chaotic signal output by the first coupler.
8. The secret optical communication system based on the double-chaotic-phase-coding encryption according to claim 1, wherein the second phase modulator, the second dispersive component, the fourth photodetector, the second adjustable gain, the third CW laser, and the second mach-zehnder modulator jointly form a receiving-end chaotic synchronization system, the receiving-end chaotic synchronization system performs nonlinear phase-intensity conversion on the optical chaotic signal output from the first output end of the third coupler, and outputs the chaotic synchronization signal under the set parameter condition, and meanwhile, the optical chaotic signal subjected to wavelength division multiplexing removal and the chaotic synchronization signal output from the second output end of the third coupler are input to the subtraction demodulation unit, and the secret information is subjected to subtraction demodulation.
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| CN113794559A (en) * | 2021-10-11 | 2021-12-14 | 广东工业大学 | Physical layer secret communication system and method based on dispersion-phase encryption |
| CN114928411A (en) * | 2021-11-15 | 2022-08-19 | 广东工业大学 | Physical layer secret communication system based on chromatic dispersion-phase feedback loop encryption |
| CN114268368B (en) * | 2021-12-01 | 2023-09-19 | 重庆邮电大学 | Design method of unmanned aerial vehicle high-capacity chaotic space laser safety emergency communication system |
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Inventor after: Gao Zhensen Inventor after: Li Qihua Inventor after: Wang Yuncai Inventor after: Qin Yuwen Inventor before: Li Qihua Inventor before: Gao Zhensen Inventor before: Wang Yuncai Inventor before: Qin Yuwen |
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