CN112821960A - Secure communication device and secure communication method thereof - Google Patents
Secure communication device and secure communication method thereof Download PDFInfo
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- CN112821960A CN112821960A CN202011643719.9A CN202011643719A CN112821960A CN 112821960 A CN112821960 A CN 112821960A CN 202011643719 A CN202011643719 A CN 202011643719A CN 112821960 A CN112821960 A CN 112821960A
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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
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
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Abstract
The present disclosure provides a secure communication apparatus including: the first communication module is used for generating and carrying modulated laser of a security signal; the second communication module is used for generating a broadband optical signal carrying a broadband random signal; the second communication module is also used for dividing the broadband optical signal into a first optical signal and a second optical signal which carry broadband random signals, transmitting the first optical signal to the processing module and transmitting the second optical signal to the first communication module; the first communication module is further used for receiving the second optical signal, coupling and modulating the laser and the second optical signal, generating a third optical signal, and transmitting the third optical signal to the processing module, wherein the third optical signal carries a mixed signal formed by mixing a secret signal and a broadband random signal; and the processing module is used for receiving and detecting the broadband random signal carried by the first optical signal, receiving and detecting the mixed signal carried by the third optical signal, and carrying out differential processing on the broadband random signal and the mixed signal to obtain the secret signal. The present disclosure provides a secure communication method.
Description
Technical Field
The disclosure relates to the field of secure communication, and in particular relates to a secure communication device and a secure communication method thereof.
Background
Optical fiber communication is a communication mode in which light waves are used as information carriers and optical fibers are used as transmission media. Optical fiber communication has been widely used in various layers of network transmission due to its advantages of large communication capacity, long transmission distance, and small signal interference. The safety problem of optical fiber transmission has become an important research topic.
The encryption of the confidential signals can be realized by adopting the microwave signals generated by the photoelectric oscillator, but the traditional photoelectric oscillator only has a single cavity length and can only generate the microwave signals with specific frequency, and the microwave signals with specific frequency cannot completely cover the confidential signals, so that certain potential safety hazards exist in optical fiber communication.
Disclosure of Invention
In view of the above, in order to overcome at least one aspect of the above problems, the present disclosure provides a secure communication apparatus including: the system comprises a first communication module, a second communication module and a processing module;
the first communication module is used for generating modulated laser carrying a preset security signal;
the second communication module is used for generating a broadband optical signal carrying a broadband random signal;
the second communication module is further configured to divide the broadband optical signal into a first optical signal and a second optical signal, transmit the first optical signal to the processing module, and transmit the second optical signal to the first communication module, where the first optical signal and the second optical signal both carry the broadband random signal;
the first communication module is further configured to receive the second optical signal, couple the modulated laser and the second optical signal, generate a third optical signal, and transmit the third optical signal to the processing module, where the third optical signal carries a mixed signal, and the mixed signal is a signal formed by mixing the preset secret signal and the broadband random signal;
the processing module is configured to receive and detect a broadband random signal carried by the first optical signal, receive and detect a mixed signal carried by the third optical signal, and perform differential processing on the broadband random signal and the mixed signal to obtain the preset secret signal.
Optionally, the frequency of the preset secret signal is within a wideband range of the wideband random signal, and the wideband range of the wideband random signal is tunable.
Optionally, the first communication module comprises a laser, a modulator and a first optical coupler;
the laser is used for generating laser;
the modulator is used for modulating a preset security signal onto the laser to generate modulated laser;
the first optical coupler is configured to receive the modulated laser and the second optical signal, couple the modulated laser and the second optical signal, generate a third optical signal, and transmit the third optical signal to the processing module, where the third optical signal carries a mixed signal, and the mixed signal is an electrical signal formed by mixing the preset secret signal and the broadband random signal.
Optionally, the second communication module comprises a broadband random optoelectronic oscillator and a second optical coupler;
the broadband random photoelectric oscillator is used for generating a broadband optical signal carrying a broadband random signal;
the second optical coupler is used for receiving the broadband optical signal, dividing the broadband optical signal into a first optical signal and a second optical signal, transmitting the first optical signal to the processing module, and transmitting the second optical signal to the first communication module, wherein the first optical signal and the second optical signal both carry the broadband random signal.
Optionally, the broadband random optoelectronic oscillator is specifically configured to generate a broadband optical signal carrying a broadband random signal according to the frequency of the preset security signal, so that the frequency of the preset security signal is within a broadband range of the broadband random signal.
Optionally, the processing module comprises a first photodetector, a second photodetector and an analysis unit;
the first optical detector is connected with the first communication module through an optical fiber channel and is used for receiving and detecting the mixed signal carried by the third optical signal;
the second optical detector is connected with the second communication module through an optical fiber channel and used for receiving and detecting the broadband random signal carried by the first optical signal;
the analysis unit is configured to receive the mixed signal detected by the first optical detector, receive the broadband random signal detected by the second optical detector, and perform differential processing on the mixed signal and the broadband random signal to obtain the preset security signal
Optionally, the first communication module further includes a first erbium-doped fiber amplifier and a first variable optical attenuator, and the second communication module further includes a second erbium-doped fiber amplifier and a second variable optical attenuator;
the first erbium-doped fiber amplifier and the first variable optical attenuator are used for adjusting the power of the third optical signal;
and the second erbium-doped fiber amplifier and the second variable optical attenuator are used for adjusting the power of the first optical signal.
Optionally, the first optical coupler has a splitting ratio of 50% to 50%.
Optionally, the second optical coupler has a splitting ratio of 50% to 50%.
The present disclosure also provides a secure communication method, based on any one of the above secure communication apparatuses, the method including:
generating modulated laser carrying a preset security signal through a first communication module;
generating a broadband optical signal carrying a broadband random signal by a second communication module;
dividing the broadband optical signal into a first optical signal and a second optical signal through a second communication module, transmitting the first optical signal to the processing module, and transmitting the second optical signal to the first communication module;
receiving the second optical signal through a first communication module, coupling the modulated laser and the second optical signal to generate a third optical signal, and transmitting the third optical signal to the processing module, wherein the third optical signal carries the mixed signal;
and receiving and detecting a broadband random signal carried by the first optical signal through a processing module, receiving and detecting a mixed signal carried by the third optical signal, and carrying out differential processing on the broadband random signal and the mixed signal to obtain the preset secret signal.
Compared with the prior art, the method has the following beneficial effects:
1. the broadband random photoelectric oscillator can realize continuous change of the cavity length of the photoelectric oscillator by using Rayleigh scattering of the optical fiber as random distribution feedback, so that a broadband random signal without longitudinal mode interval is generated, and the center frequency and the bandwidth of the broadband random signal can be tuned.
2. Since the frequency of the security signal is within the wideband range of the wideband random signal, the random signal may overlay the security signal, making it difficult to detect the security signal in the coupled optical signal.
3. After beat frequency and difference processing are carried out on the broadband random signal and the mixed signal, a secret signal can be extracted from the mixed signal, and encryption transmission of the secret signal is realized.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic diagram of a secure communications apparatus of an embodiment of the present disclosure;
FIG. 2 schematically illustrates a schematic diagram of a secure communications apparatus according to another embodiment of the present disclosure;
FIG. 3 schematically illustrates a schematic diagram of a secure communications apparatus according to another embodiment of the present disclosure;
fig. 4 schematically illustrates a flow chart of a secure communication method of an embodiment of the present disclosure.
Detailed Description
In order to more clearly illustrate the embodiments or prior art solutions of the present disclosure, reference will now be made briefly to the drawings that are used in the description of the embodiments or prior art, and it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present disclosure. For a person skilled in the art, without inventive effort, further figures can be derived from these figures. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
Fig. 1 schematically illustrates a schematic diagram of a secure communication device according to an embodiment of the present disclosure. As shown in fig. 1, the present disclosure provides a secure communication device 100 comprising:
the system comprises a first communication module 1, a second communication module 2 and a processing module 3;
the first communication module 1 is used for generating modulated laser carrying a preset security signal;
the second communication module 2 is used for generating a broadband optical signal carrying a broadband random signal;
the second communication module 2 is further configured to divide the broadband optical signal into a first optical signal and a second optical signal, transmit the first optical signal to the processing module 3, and transmit the second optical signal to the first communication module 1, where the first optical signal and the second optical signal both carry broadband random signals;
the first communication module 1 is further configured to receive the second optical signal, couple and modulate the laser and the second optical signal, generate a third optical signal, and transmit the third optical signal to the processing module 3, where the third optical signal carries a mixed signal, and the mixed signal is a signal formed by mixing a preset secret signal and a broadband random signal;
and the processing module 3 is configured to receive and detect a broadband random signal carried by the first optical signal, receive and detect a mixed signal carried by the third optical signal, and perform differential processing on the broadband random signal and the mixed signal to obtain a preset secret signal.
In the disclosed embodiment, the frequency of the predetermined secret signal is within a wideband range of the wideband random signal, and the wideband range of the wideband random signal is tunable. The second communication module 2 generates a broadband random signal based on the frequency of the known secret signal. In particular, the wideband range of the wideband random signal may cover the secret signal frequency. The broadband random signal does not carry any displayable information, and after the broadband random signal covers the secret signal, the secret signal is not displayed any more. Therefore, after the first communication module 1 couples the second optical signal and the modulated laser, when a third party intercepts the third optical signal, no information can be detected from the third optical signal.
And after receiving the third light beam carrying the mixed signal and the first light beam carrying the broadband random signal, the specific receiving party performs differential processing on the mixed signal and the broadband random signal, so that the secret signal can be extracted from the mixed signal. The broadband random signal, the secret signal and the mixed signal are all electric signals, and the laser and the broadband optical signal are used as optical carriers to transmit information carried by the electric signals.
By the implementation of the method, the confidential signals are subjected to coverage encryption through the broadband random signals, so that except for the sending end and the target receiving end, a third party cannot detect related information from the signals intercepted from one independent communication module, and the security of the confidential information is enhanced.
Fig. 2 schematically shows a schematic diagram of a secure communication apparatus according to another embodiment of the present disclosure, and as shown in fig. 2, the first communication module 1 includes a laser 11, a modulator 12, and a first optical coupler 13. The laser 11 is used for generating laser; the modulator 12 is configured to modulate a preset security signal onto the laser to generate a modulated laser; the first optical coupler 13 is configured to receive the modulated laser and the second optical signal, couple the modulated laser and the second optical signal, generate a third optical signal, and transmit the third optical signal to the processing module 3, where the third optical signal carries a mixed signal, and the mixed signal is an electrical signal formed by mixing a preset secret signal and a broadband random signal.
The second communication module 2 comprises a broadband random optoelectronic oscillator 21 and a second optical coupler 22. A broadband random optoelectronic oscillator 21 for generating a broadband optical signal carrying a broadband random signal; the second optical coupler 22 is configured to receive the broadband optical signal, divide the broadband optical signal into a first optical signal and a second optical signal, transmit the first optical signal to the processing module 3, and transmit the second optical signal to the first communication module 1, where the first optical signal and the second optical signal both carry broadband random signals.
The processing module 3 comprises a first light detector 31, a second light detector 32 and an analyzing unit 33. The first optical detector 31 is connected to the first communication module 1 through an optical fiber channel 41, and is configured to receive and detect a broadband random signal carried by the first optical signal; the second optical detector 32 is connected to the second communication module 2 through an optical fiber channel 42, and is configured to receive and detect the mixed signal carried by the third optical signal; and the analysis unit 33 is configured to synchronously receive the mixed signal and the broadband random signal detected by the first optical detector 31 and the second optical detector 32, and perform differential processing on the mixed signal and the broadband random signal to obtain a preset security signal.
In the embodiment of the present disclosure, the broadband random optoelectronic oscillator 21 may realize continuous cavity length variation of the optoelectronic oscillator by using rayleigh scattering in the optical fiber as random distribution feedback, and a loop of the broadband random optoelectronic oscillator 21 may be regarded as a set of a plurality of ring cavities with different lengths. Compared with the traditional photoelectric oscillator, the broadband random photoelectric oscillator 21 can generate broadband random signals without longitudinal mode intervals through self-excited oscillation, and the center frequency and the bandwidth of the broadband random signals can be tunable.
Specifically, on the premise that the frequency of the secret signal is known, the broadband random optoelectronic oscillator 21 generates a broadband optical signal carrying a broadband random signal according to the frequency of the secret signal, wherein the frequency of the secret signal is preset within the broadband range of the broadband random signal. Thus, after coupling the second optical signal carrying the broadband random signal with the modulated laser carrying the security signal, the broadband random signal will overwrite the security signal. Because the broadband random signal does not carry any displayable information, the security signal is not displayed any more after the security signal is covered by the broadband random signal. When a third party intercepts the third optical signal, no information can be detected from the third optical signal.
The first optical coupler 13 is connected to the first optical detector 31 through the optical fiber channel 41, and the first optical detector 31 receives the third optical signal. The second optical coupler 22 is connected to the second optical detector 32 through the optical fiber channel 42, and the second optical detector 32 receives the first optical signal. In order to ensure that the secure communications can be accurately extracted from the mixed signal, the analysis unit 33 needs to receive the mixed signal and the broadband random signal at the same time. Therefore, the time delay of the third optical signal and the first optical signal can be controlled by designing the lengths of the optical fiber channels 41 and 42, so that the first optical detector 31 and the second optical detector 32 can simultaneously receive the third optical signal and the first optical signal, respectively, and simultaneously transmit the mixed signal and the broadband random signal to the analysis unit 33. The splitting ratio of the first optical coupler 13 is 50% to 50%, and the splitting ratio of the second optical coupler 22 is 50% to 50%. The lengths of the optical fiber channels 41 and 42 and the splitting ratios of the first optical coupler 13 and the second optical coupler 22 can be set by those skilled in the art according to actual needs, and the present disclosure does not limit the lengths of the optical fiber channels and the splitting ratios of the optical couplers.
Fig. 3 schematically shows a schematic diagram of a secure communication apparatus according to another embodiment of the present disclosure. As shown in fig. 3, the first communication module 1 further includes a first erbium-doped fiber amplifier 14 and a first variable optical attenuator 15, and the second communication module 2 further includes a second erbium-doped fiber amplifier 23 and a second variable optical attenuator 24. A first erbium-doped fiber amplifier 14 and a first variable optical attenuator 15 for adjusting the power of the third optical signal; a second erbium-doped fiber amplifier 23 and a second variable optical attenuator 24 for adjusting the power of the first optical signal.
In the embodiment of the present disclosure, the laser 11, the modulator 12, the first optical coupler 13, the first erbium-doped fiber amplifier 14, the first variable optical attenuator 15, and the first photodetector 31 are connected in sequence by optical fiber jumpers. The broadband random optoelectronic oscillator 21, the second optical coupler 22, the second erbium-doped fiber amplifier 23, the second variable optical attenuator 24 and the second optical detector 32 are connected in sequence through optical fiber jumpers. The first light detector 31 and the second light detector 32 are connected to the analysis unit 33 by cables, respectively.
Because there is a loss phenomenon in the optical signal in the actual optical fiber transmission process, in order to enable the first optical detector 31 and the second optical detector 32 to accurately detect the optical signal, the first communication module 1 and the second communication module 2 are respectively provided with the erbium-doped optical fiber amplifier and the adjustable optical attenuator, and the erbium-doped optical fiber amplifier and the adjustable optical attenuator adjust the optical power of the optical signal, so that the first optical detector 31 and the second optical detector 32 respectively receive the first optical signal and the third optical signal stably and accurately, and the optical powers of the first optical signal and the third optical signal are consistent.
The present disclosure provides a detailed secret communication method, which is suitable for the secret communication device, and fig. 4 is a flow chart schematically illustrating the secret communication method according to the embodiment of the present disclosure.
As shown in fig. 4, the secure communication method at least includes the following steps:
s1, generating modulated laser carrying preset security signals through a first communication module;
s2, generating a broadband optical signal carrying a broadband random signal through a second communication module;
s3, dividing the broadband optical signal into a first optical signal and a second optical signal through a second communication module, transmitting the first optical signal to a processing module, and transmitting the second optical signal to a first communication module;
s4, receiving the second optical signal through the first communication module, coupling and modulating the laser and the second optical signal, generating a third optical signal, and transmitting the third optical signal to the processing module, wherein the third optical signal carries a mixed signal;
and S5, receiving and detecting the broadband random signal carried by the first optical signal through the processing module, receiving and detecting the mixed signal carried by the third optical signal, and carrying out differential processing on the broadband random signal and the mixed signal to obtain a preset secret signal.
It should be noted that the secret communication method in the embodiment of the present disclosure corresponds to the secret communication apparatus in the embodiment of the present disclosure, and the description of the communication method specifically refers to the secret communication apparatus, which is not described herein again.
It should also be noted that, in case of conflict, the embodiments and features of the embodiments of the present disclosure may be combined with each other to obtain new embodiments.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present disclosure and not for limiting, and although the present disclosure is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present disclosure without departing from the spirit and scope of the technical solutions of the present disclosure.
Claims (10)
1. A secure communications device, comprising:
the system comprises a first communication module, a second communication module and a processing module;
the first communication module is used for generating modulated laser carrying a preset security signal;
the second communication module is used for generating a broadband optical signal carrying a broadband random signal;
the second communication module is further configured to divide the broadband optical signal into a first optical signal and a second optical signal, transmit the first optical signal to the processing module, and transmit the second optical signal to the first communication module, where the first optical signal and the second optical signal both carry the broadband random signal;
the first communication module is further configured to receive the second optical signal, couple the modulated laser and the second optical signal, generate a third optical signal, and transmit the third optical signal to the processing module, where the third optical signal carries a mixed signal, and the mixed signal is a signal formed by mixing the preset secret signal and the broadband random signal;
the processing module is configured to receive and detect a broadband random signal carried by the first optical signal, receive and detect a mixed signal carried by the third optical signal, and perform differential processing on the broadband random signal and the mixed signal to obtain the preset secret signal.
2. The apparatus of claim 1, wherein the preset secret signal has a frequency within a wideband range of the wideband random signal, and wherein the wideband range of the wideband random signal is tunable.
3. The apparatus of claim 1, wherein the first communication module comprises a laser, a modulator, and a first optical coupler;
the laser is used for generating laser;
the modulator is used for modulating a preset security signal onto the laser to generate modulated laser;
the first optical coupler is configured to receive the modulated laser and the second optical signal, couple the modulated laser and the second optical signal, generate a third optical signal, and transmit the third optical signal to the processing module, where the third optical signal carries a mixed signal, and the mixed signal is an electrical signal formed by mixing the preset secret signal and the broadband random signal.
4. The apparatus of claim 1, wherein the second communication module comprises a broadband random optoelectronic oscillator and a second optical coupler;
the broadband random photoelectric oscillator is used for generating a broadband optical signal carrying a broadband random signal;
the second optical coupler is used for receiving the broadband optical signal, dividing the broadband optical signal into a first optical signal and a second optical signal, transmitting the first optical signal to the processing module, and transmitting the second optical signal to the first communication module, wherein the first optical signal and the second optical signal both carry the broadband random signal.
5. The apparatus of claim 4, wherein the broadband random optoelectronic oscillator is configured to generate a broadband optical signal carrying a broadband random signal according to a frequency of the predetermined security signal, such that the frequency of the predetermined security signal is within a broadband range of the broadband random signal.
6. The apparatus of claim 1, wherein the processing module comprises a first light detector, a second light detector, and an analysis unit;
the first optical detector is connected with the first communication module through an optical fiber channel and is used for receiving and detecting the mixed signal carried by the third optical signal;
the second optical detector is connected with the second communication module through an optical fiber channel and used for receiving and detecting the broadband random signal carried by the first optical signal;
the analysis unit is configured to receive the mixed signal detected by the first optical detector, receive the broadband random signal detected by the second optical detector, and perform differential processing on the mixed signal and the broadband random signal to obtain the preset security signal.
7. The apparatus of claim 1, wherein said first communication module further comprises a first erbium-doped fiber amplifier and a first variable optical attenuator, and said second communication module further comprises a second erbium-doped fiber amplifier and a second variable optical attenuator;
the first erbium-doped fiber amplifier and the first variable optical attenuator are used for adjusting the power of the third optical signal;
and the second erbium-doped fiber amplifier and the second variable optical attenuator are used for adjusting the power of the first optical signal.
8. The apparatus of claim 3 wherein the first optical coupler has a splitting ratio of 50% to 50%.
9. The apparatus of claim 4, wherein the second optical coupler has a splitting ratio of 50% to 50%.
10. A secure communication method, based on the secure communication apparatus of any one of claims 1 to 9, the method comprising:
generating modulated laser carrying a preset security signal through a first communication module;
generating a broadband optical signal carrying a broadband random signal by a second communication module;
dividing the broadband optical signal into a first optical signal and a second optical signal through a second communication module, transmitting the first optical signal to the processing module, and transmitting the second optical signal to the first communication module;
receiving the second optical signal through a first communication module, coupling the modulated laser and the second optical signal to generate a third optical signal, and transmitting the third optical signal to the processing module, wherein the third optical signal carries the mixed signal;
and receiving and detecting a broadband random signal carried by the first optical signal through a processing module, receiving and detecting a mixed signal carried by the third optical signal, and carrying out differential processing on the broadband random signal and the mixed signal to obtain the preset secret signal.
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