CN112600661B - Secret communication system based on double chaotic modulation - Google Patents
Secret communication system based on double chaotic modulation Download PDFInfo
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- CN112600661B CN112600661B CN202011433232.8A CN202011433232A CN112600661B CN 112600661 B CN112600661 B CN 112600661B CN 202011433232 A CN202011433232 A CN 202011433232A CN 112600661 B CN112600661 B CN 112600661B
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
Abstract
The invention relates to a secret communication system based on double chaotic modulation, comprising: the transmitting end comprises a first chaotic laser connected with a coupler, the coupler is connected with a first isolator, the first isolator is connected with a photoelectric switch, a second chaotic laser is connected with a second isolator, and the second isolator is connected with the photoelectric switch; the receiving end comprises a third chaotic laser and a circulator which are in communication connection, the circulator is in communication connection with a second photoelectric detector, the second photoelectric detector is in communication connection with a cross correlator, the cross correlator is in communication connection with a first radio frequency amplifier and a decision device respectively, and the first radio frequency amplifier is in communication connection with the first photoelectric detector; the circulator is in communication connection with the coupler, and the photoelectric switch is in communication connection with the first photoelectric detector. The invention uses double chaos to spread spectrum for digital information, synchronously generates completely same chaos sequence, after the sending end receives information modulation, the receiving end uses synchronous local signal to demodulate information, and realizes secret communication.
Description
Technical Field
The invention belongs to the technical field of secret communication and information security, and particularly relates to a secret communication system based on double chaotic modulation.
Background
The chaos is a deterministic random-like process, the chaos sequence is used as the carrier wave for communication, and the chaos sequence has the characteristics of noise-like, wide band, good correlation, unpredictable long-term behavior and the like, so the chaos sequence has a good application prospect in the field of secret communication.
When the energy of the chaotic spread spectrum energy signal is spread to the chaotic carrier with a wide frequency band, the power spectral density of the chaotic spread spectrum energy signal is low and difficult to detect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a secret communication system based on double chaotic modulation.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a secure communication system based on dual chaotic modulation, comprising:
the transmitting terminal comprises a first chaotic laser, a second chaotic laser, a first isolator, a second isolator, a photoelectric switch and a coupler, wherein the first chaotic laser is in communication connection with the coupler;
the receiving end comprises a third chaotic laser, a circulator, a first photoelectric detector, a second photoelectric detector, a first radio frequency amplifier, a second radio frequency amplifier, a cross correlator and a decision device, wherein the third chaotic laser is in communication connection with the circulator, the circulator is in communication connection with the second photoelectric detector, the second photoelectric detector is in communication connection with the cross correlator, the cross correlator is in communication connection with the first radio frequency amplifier and the decision device respectively, and the first radio frequency amplifier is in communication connection with the first photoelectric detector;
the circulator is in communication connection with the coupler, and the photoelectric switch is in communication connection with the first photoelectric detector.
Preferably, the coupler and the circulator are connected through an optical fiber to form a chaotic synchronization link between the first chaotic laser and the third chaotic laser.
Preferably, the wavelengths of the signals generated by the first chaotic laser, the second chaotic laser and the third chaotic laser are all 1550nm, and the power is 10 mW.
As a preferred scheme, the external cavity feedback delay time of the first chaotic laser and the external cavity feedback delay time of the third chaotic laser are both 2.67ns, and the external cavity feedback delay time of the second chaotic laser is 3.67 ns.
Preferably, the threshold current of the first chaotic laser and the threshold current of the third chaotic laser are 32mA, and the threshold current of the second chaotic laser is 37 mA.
Preferably, the number of transparent carriers of the first chaotic laser, the second chaotic laser and the third chaotic laser is 1.6633 multiplied by 108。
Preferably, when the maximum cross-correlation of the cross-correlator is 1, the transmission is 1; otherwise, the transmission is 0.
Preferably, the quantum efficiency of the first photodetector and the quantum efficiency of the second photodetector are both 10%.
Preferably, the threshold voltage of the photoelectric switch is 5.4V.
Compared with the prior art, the invention has the beneficial effects that:
the invention is different from the existing chaotic communication system in that the double chaos is used for spreading the digital information, the sending end and the receiving end synchronously generate a chaos sequence which is completely the same as one chaos sequence, and after the sending end is modulated by the information, the receiving end carries out convolution operation by utilizing the synchronous local signal, thereby finally realizing the demodulation of the information and realizing the secret communication.
The invention not only realizes chaotic synchronous communication, but also has the characteristics of low cost, stable performance, strong confidentiality and the like.
Drawings
Fig. 1 is a frame diagram of a secure communication system based on dual chaotic modulation according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a chaotic signal generated by a first chaotic laser at a transmitting end according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a chaotic signal generated by a second chaotic laser at a transmitting end according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a chaotic signal generated by a third chaotic laser at a receiving end according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a binary signal sent by a sending end according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a binary signal recovered by a receiving end according to an embodiment of the present invention.
Wherein: 1-1. a first chaotic laser; 1-2. a second chaotic laser; 1-3, a third chaotic laser; 2. is a coupler; 3-1. a first isolator; 3-2. a second isolator; 4. a photoelectric switch; 5-1. a first photodetector; 5-2. a second photodetector; 6-1. a first radio frequency amplifier; 6-2. a second radio frequency amplifier; 7. a cross correlator; 8. a decision device; 9. a circulator.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain specific embodiments of the present invention with reference to the accompanying drawings.
The secret communication system of the embodiment of the invention adopts double chaotic modulation and utilizes an electro-optical switch to synthesize two different chaotic signals into one signal. At a receiving end, the photoelectric detector is used for converting the combined chaotic signal into an electric signal, and the electric signal is amplified by the radio frequency amplifier. Meanwhile, the third chaotic laser is synchronous with the first chaotic laser, and a chaotic signal generated by the third chaotic laser is converted into an electric signal and amplified by a radio frequency amplifier; and then performing convolution operation on the signal in one bit time slot by using a cross correlator, wherein if the signal is close to 1, the signal is judged to be 1, and otherwise, the signal is 0.
As shown in fig. 1, the secure communication system according to the embodiment of the present invention includes a transmitting end and a receiving end.
The transmitting end comprises a first chaotic laser 1-1, a second chaotic laser 1-2, a coupler 2, a first isolator 3-1, a second isolator 3-2 and a photoelectric switch 4.
The receiving end comprises a third chaotic laser 1-3, a first photoelectric detector 5-1, a second photoelectric detector 5-2, a first radio frequency amplifier 6-1, a second radio frequency amplifier 6-2, a cross correlator 7, a decision device 8 and a circulator 9.
The coupler 2 and the circulator 9 are connected through optical fibers to form a chaotic synchronization link between the first chaotic laser 1-1 and the third chaotic laser 1-3.
The transmitting end and the receiving end are connected through an optical fiber, specifically, a port a1 of a first chaotic laser 1-1 of the transmitting end is connected with a port b1 of a first coupler 2, a port b3 of the first coupler 2 is connected with a port c1 of a first isolator 3-1, and a port c2 of the first isolator 3-1 is connected with a port d1 of a photoelectric switch 4; the port a2 of the second chaotic laser 1-2 is connected with the port c3 of the second isolator 3-2, and the port c4 of the second isolator 3-2 is connected with the port d2 of the photoelectric switch 4, so that two paths of information are combined into one path and the modulation of the information is realized.
A port k1 of the circulator 9 at the receiving end is connected with a port b2 of the coupler 2 at the transmitting end through an optical fiber, a port k2 of the circulator 9 is connected with a port a3 of the third chaotic laser 1-3, a port k3 of the circulator 9 is connected with a port h3 of the second photodetector 5-2, a port h4 of the second photodetector 5-2 is connected with a port i3 of the second radio frequency amplifier 6-2, and a port i4 of the second radio frequency amplifier 6-2 is connected with a port j3 of the cross correlator 7. The port h1 of the first photodetector 5-1 at the receiving end is connected with the d3 port of the optoelectronic switch 4 at the transmitting end through an optical fiber, the port h2 of the first photodetector 5-1 is connected with the port i1 of the first radio-frequency amplifier 6-1, and the port i2 of the first radio-frequency amplifier 6-1 is connected with the port j1 of the cross correlator 7. The port j2 of the cross correlator 7 is connected to the port l1 of the decision device 8, and demodulation of the received signal is performed by the decision device 8.
The signal wavelengths generated by the first chaotic laser, the second chaotic laser and the third chaotic laser are all 1550nm, and the power is 10 mW; the external cavity feedback delay time of the first chaotic laser and the external cavity feedback delay time of the third chaotic laser are both 2.67ns, and the external cavity feedback delay time of the second chaotic laser is 3.67 ns; the threshold current of the first chaotic laser and the third chaotic laser is 32mA, and the threshold current of the second chaotic laser is 37 mA; the number of transparent carriers of the first chaotic laser, the second chaotic laser and the third chaotic laser is 1.6633 multiplied by 108。
When the maximum cross-correlation of the cross-correlator is 1, the transmission is 1; otherwise, the transmission is 0.
The quantum efficiency of the first photodetector and the second photodetector are both 10%.
The threshold voltage of the photoelectric switch is 5.4V.
The secret communication system with chaotic synchronization of the embodiment of the invention carries out chaotic communication on transmission signals by the following method:
generating a chaotic signal as a driving signal according to a first chaotic laser 1-1 at a sending end, and sending the chaotic signal to a third chaotic laser 1-3 at a receiving end to generate a synchronous chaotic signal; the chaotic synchronization has strong robustness. The second laser 1-2 at the transmitting end is irrelevant to the first chaotic laser 1-1 due to the fact that feedback delay and bias current are different. When the information of the sending end is 1, the chaotic signal generated by the first chaotic laser 1-1 is output through the through arm of the photoelectric switch; when the information of the sending end is '0', the chaotic signal generated by the first chaotic laser is output through the cross arm of the photoelectric switch, and the two chaotic signals are synthesized and then output at the d3 port of the photoelectric switch. Due to the switching effect of the photoelectric switch, information is encrypted onto the chaotic carrier. At a receiving end, a third chaotic signal locally synchronous with the first chaotic laser 1-1 is converted into an electric chaotic signal, the modulated chaotic signal is also converted into an electric signal, two paths of electric signals are transmitted to a cross correlator for convolution operation, and the transmitted signal can be recovered after judgment by a decision device.
As shown in fig. 2 and 4, the chaotic signals generated by the transmitting end and the receiving end are completely synchronized.
As shown in fig. 3, the chaotic signal generated by the second chaotic laser is uncorrelated with the chaotic signals generated by the first and third chaotic lasers.
As shown in fig. 5 and 6, the original signal transmitted by the transmitting end is identical to the signal decrypted by the receiving end, which indicates that the system can be applied to secure communication.
The process of implementing communication is briefly summarized as follows:
1. the sending end respectively generates two chaotic signals which have good randomness but are irrelevant.
2. The receiving end generates a chaotic signal which is completely synchronous with one laser of the transmitting end.
3. And modulating digital information to the chaotic signal by using an electro-optical switch, and encrypting the signal. In this example: when the information of the sending end is '1', the chaotic signal generated by the first chaotic laser 1-1 is output through the through arm of the first photoelectric switch, and when the information of the sending end is '0', the chaotic signal generated by the first chaotic laser is output through the cross arm of the first photoelectric switch, so that the two chaotic signals are synthesized and then output at the d3 port of the first photoelectric switch.
4. The received signal is convolved with a cross correlator.
5. The transmitted information can be recovered using a decision taker.
The chaotic communication method and the chaotic communication device realize chaotic communication by utilizing common devices, and have the characteristics of low cost, stable performance, low error rate, strong confidentiality and the like.
While the preferred embodiments and principles of this invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments based on the teachings of the invention and such variations are considered to be within the scope of the invention.
Claims (9)
1. A secure communication system based on dual chaotic modulation, comprising:
the transmitting terminal comprises a first chaotic laser, a second chaotic laser, a first isolator, a second isolator, a photoelectric switch and a coupler, wherein the first chaotic laser is in communication connection with the coupler;
the receiving end comprises a third chaotic laser, a circulator, a first photoelectric detector, a second photoelectric detector, a first radio frequency amplifier, a second radio frequency amplifier, a cross correlator and a decision device, wherein the third chaotic laser is in communication connection with the circulator, the circulator is in communication connection with the second photoelectric detector, the second photoelectric detector is in communication connection with the cross correlator, the cross correlator is in communication connection with the first radio frequency amplifier and the decision device respectively, and the first radio frequency amplifier is in communication connection with the first photoelectric detector;
the circulator is in communication connection with the coupler, and the photoelectric switch is in communication connection with the first photoelectric detector.
2. A secret communication system based on double chaotic modulation according to claim 1, characterized in that the coupler and the circulator are connected through an optical fiber to form a chaotic synchronization link between the first chaotic laser and the third chaotic laser.
3. A secret communication system based on dual chaotic modulation according to claim 1, wherein the first chaotic laser, the second chaotic laser and the third chaotic laser generate signals with wavelength of 1550nm and power of 10 mW.
4. A secret communication system based on double chaotic modulation according to claim 1, wherein the external cavity feedback delay time of the first chaotic laser and the external cavity feedback delay time of the third chaotic laser are both 2.67ns, and the external cavity feedback delay time of the second chaotic laser is 3.67 ns.
5. A secret communication system based on dual chaotic modulation according to claim 1, wherein the threshold current of the first chaotic laser and the third chaotic laser is 32mA, and the threshold current of the second chaotic laser is 37 mA.
6. A secret communication system based on double chaotic modulation according to claim 1, characterized in that the number of transparent carriers of the first chaotic laser, the second chaotic laser and the third chaotic laser is 1.6633 x 108。
7. A dual chaotic modulation based secure communication system according to claim 1, wherein when the maximum cross-correlation of the cross-correlator is 1, the transmission is 1; otherwise, the transmission is 0.
8. A secret communication system based on double chaotic modulation according to claim 1, characterized in that the quantum efficiency of the first photodetector and the quantum efficiency of the second photodetector are both 10%.
9. A secret communication system based on dual chaotic modulation according to claim 1, characterized in that the threshold voltage of the photoelectric switch is 5.4V.
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