Key distribution method, device and equipment based on all-optical concealment and storage medium

Abstract

The application discloses a key distribution method based on full-optical hiding, which comprises the following steps: generating a sinusoidal microwave signal, processing the sinusoidal microwave signal through a microwave amplifier, modulating the sinusoidal microwave signal into a laser by combining a preset bias current, and outputting the modulated sinusoidal microwave signal in the form of an optical pulse signal; after filtering the optical pulse signal based on an optical filter, sending the optical pulse signal processed by an optical coupler to a receiving end; filtering and suppressing the noise in the received optical pulse signal by the receiving end, extracting the phase information of the filtered and suppressed optical pulse signal, converting the phase difference into an amplitude difference of an electric pulse signal, filtering and analog-digital converting the electric pulse signal, and obtaining a key waveform. The application further discloses a key distribution device based on full-optical hiding, a corresponding equipment and a storage medium. The key distribution method based on full-optical hiding provided by the application can improve the efficiency of key distribution and reduce the risk of key theft.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication technology, and more particularly, to a key distribution method and device based on all-optical concealment, equipment and storage medium. BACKGROUND

[0002] With the rapid development of information technology, information security problems are increasingly prominent. Traditional key distribution methods, such as encryption methods based on cryptography, can protect the security of information transmission to some extent, but still have the risk of being cracked. In particular, in some sensitive fields, the demand for information security is more urgent. Therefore, it is necessary to find a more secure and reliable key distribution method.

[0003] With the continuous development of optical communication technology, optical communication means has the characteristics of fast transmission speed, long transmission distance, and strong anti-interference ability. Therefore, there is an urgent need for a method of key distribution using optical communication technology. SUMMARY

[0004] In view of at least one defect or improvement demand of the prior art, the present application provides a key distribution method and device based on all-optical concealment, equipment and storage medium, which can solve at least one of the technical problems in the background art.

[0005] To achieve the above-mentioned purpose, according to the first aspect of the present application, a key distribution method based on all-optical concealment is provided, which comprises:

[0006] generating a sinusoidal microwave signal, processing the sinusoidal microwave signal through a microwave amplifier, modulating the processed sinusoidal microwave signal into a laser by combining a preset bias current, and outputting the modulated sinusoidal microwave signal in the form of an optical pulse signal;

[0007] After filtering and processing the optical pulse signal based on an optical filter, the coupled and processed optical pulse signal is sent to a receiving end via an optical coupler;

[0008] The receiving end filters and suppresses the noise in the received optical pulse signal, extracts the phase information of the filtered and suppressed optical pulse signal, converts the phase difference of the optical pulse signal into the amplitude difference of an electrical pulse signal, obtains the corresponding electrical pulse signal, filters and digitizes the electrical pulse signal, and obtains a key waveform.

[0009] Further, the above-mentioned key distribution method based on all-optical concealment has two receiving ends, wherein the first receiving end directly receives the coupled and processed optical pulse signal, and the second receiving end receives the coupled and processed optical pulse signal via a transmission link.

[0010] Further, the key distribution method based on full-optical concealment, the coupled processed optical pulse signal is sent to the receiving end, before transmission via the transmission link, the coupled processed optical pulse signal is dispersed by the dispersion module;

[0011] The dispersion processing includes processing the processed optical pulse signal into a noise-like signal in the time domain, and changing the frequency domain into a noise-like spectrum by controlling the laser parameter;

[0012] After receiving the dispersed processed optical pulse signal at the receiving end, the dispersed processed optical pulse signal is obtained by the dispersion compensation module.

[0013] Further, the key distribution method based on full-optical concealment, the coupled processed optical pulse signal is sent to the receiving end, before transmission via the transmission link, the coupled processed optical pulse signal is dispersed by the dispersion module;

[0014] Further, the key distribution method based on full-optical concealment, the transmission link is a 25km transmission link.

[0015] Further, the key distribution method based on full-optical concealment, the receiving end filters and suppresses the noise in the received optical pulse signal, extracts the phase information of the filtered and suppressed optical pulse signal, specifically including filtering and suppressing the common signal and noise in the link by the optical filter, and extracting the phase information in the received optical pulse signal by the AMZI module.

[0016] According to the second aspect of the present application, a key distribution device based on full-optical concealment is also provided, which comprises:

[0017] The microwave signal source module is used for generating a sinusoidal microwave signal, and processing the sinusoidal microwave signal by a microwave amplifier;

[0018] The laser module is used for modulating the processed sinusoidal microwave signal into a laser by combining a preset bias current, and outputting the modulated sinusoidal microwave signal in the form of an optical pulse signal;

[0019] The optical coupler module is used for sending the coupled processed optical pulse signal to the receiving end via the optical coupler after filtering processing the optical pulse signal based on the optical filter;

[0020] The band-pass filter module is used for filtering and suppressing the noise in the received optical pulse signal by the receiving end;

[0021] An AMZI module is configured to extract phase information of the filtered and suppressed optical pulse signal, convert a phase difference of the optical pulse signal into an amplitude difference of an electrical pulse signal, and obtain a corresponding electrical pulse signal.

[0022] An analog-digital conversion module is configured to filter and analog-digital convert the electrical pulse signal, and obtain a key waveform.

[0023] According to a third aspect of the present application, there is also provided a key distribution device based on all-optical hiding, comprising at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program which, when executed by the processing unit, causes the processing unit to perform the steps of any of the above methods.

[0024] According to a fourth aspect of the present application, there is also provided a storage medium storing a computer program executable by a key distribution device based on all-optical hiding, which, when running on the key distribution device based on all-optical hiding, causes the key distribution device based on all-optical hiding to perform the steps of any of the above methods.

[0025] According to a fifth aspect of the present application, there is also provided a computer program product comprising a computer program which, when executed by a processor, implements the steps of any of the above methods.

[0026] Overall, the above technical solutions conceived by the present application can achieve the following beneficial effects compared with the prior art:

[0027] The key distribution method based on all-optical hiding provided by the present application uses all-optical hiding for key distribution, which can realize high-speed and long-distance key distribution while ensuring the security of the key, not only improving the efficiency of key distribution, but also reducing the risk of key theft. The protection of both parties to the communication is high performance, and the high-speed anti-interference characteristics of optical communication are combined with each other, meeting the increasing demand for information security and high concealment of current communication. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 A flowchart of the key distribution method based on all-optical hiding provided by the embodiments of the present application is shown in the figure.

[0030] Figure 2The structure schematic diagram of the full-optical hidden key distribution device provided by the embodiment of the present application is shown in the figure;

[0031] Figure 3 The structure schematic diagram of the receiving end of the full-optical hidden key distribution device provided by the embodiment of the present application is shown in the figure;

[0032] Figure 4 The key waveform schematic diagram extracted by the first receiving end provided by the embodiment of the present application is shown in the figure;

[0033] Figure 5 The key waveform schematic diagram extracted by the second receiving end provided by the embodiment of the present application is shown in the figure;

[0034] Figure 6 The cross-correlation function schematic diagram of the output waveforms of the first receiving end and the second receiving end provided by the embodiment of the present application is shown in the figure;

[0035] Figure 7 The signal spectrum schematic diagram of the signal intercepted by the third party provided by the embodiment of the present application is shown in the figure;

[0036] Figure 8 The signal waveform schematic diagram of the signal intercepted by the third party provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0038] The terms "first", "second", "third" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed or can optionally include other steps or units inherent to the process, method, product or device.

[0039] Figure 1 The flowchart schematic diagram of the full-optical hidden key distribution method provided by the embodiment of the present application is shown in the figure, Figure 1 The full-optical hidden key distribution method provided by the embodiment of the present application includes:

[0040] The sinusoidal microwave signal is generated, processed by a microwave amplifier, combined with a preset bias current, and modulated into a laser, and the modulated sinusoidal microwave signal is output in the form of an optical pulse signal.

[0041] After the optical filter filters the optical pulse signal, the optical pulse signal is processed by an optical coupler and sent to a receiving end.

[0042] The receiving end filters and suppresses the noise in the received optical pulse signal, extracts the phase information of the filtered and suppressed optical pulse signal, converts the phase difference of the optical pulse signal into the amplitude difference of an electrical pulse signal, obtains the corresponding electrical pulse signal, filters and digitizes the electrical pulse signal, and obtains a key waveform.

[0043] Specifically, Figure 2 The full-optical hidden key distribution device structure provided by the embodiment of the application is described below Figure 2 The process of the full-optical hidden key distribution method provided by the embodiment of the application is described.

[0044] The sinusoidal microwave signal is generated and transmitted by a microwave signal source, amplified by a microwave amplifier, combined with a preset bias current, and modulated into a laser, and the modulated amplified sinusoidal microwave signal is output in the form of an optical pulse. The phase difference between different optical pulses has randomness. The bias current is pre-selected according to actual working requirements.

[0045] After the output optical pulse signal is filtered by an optical filter to filter the optical noise in the pulse, it is input into an optical coupler. On the other hand, an ASE (amplified spontaneous emission) light source generates an optical signal, which is processed by an attenuator and a band trap filter and then input into the optical coupler. The optical coupler couples and processes the above signals and sends them to a receiving end.

[0046] In the receiving end, the common signal and noise signal in the link are first filtered and suppressed by an optical filter, and then the optical pulse phase information is extracted by an MZI module, and the phase difference of the optical pulse signal is converted into the amplitude difference of an electrical pulse signal. Because the generated optical pulse signal has true randomness, the amplitude difference of the generated electrical pulse signal is also true random, that is, an amplitude random electrical pulse signal is obtained. The electrical pulse signal is filtered and digitized, and after the digitization processing, a key waveform diagram is obtained. The random difference of the phase of the optical signal is converted into the random difference of the amplitude of the electrical signal, and a true random number, that is, a key, is obtained through analog-digital conversion.

[0047] The key distribution method based on full-optical hiding provided by the embodiments of the present application uses full-optical hiding for key distribution, can realize high-speed and long-distance key distribution, guarantees the security of the key, improves the efficiency of key distribution, and reduces the risk of key theft, and combines the high performance of protection of the two communication parties and the high-speed anti-interference characteristics of optical communication to meet the increasing demand for information security and the demand for high concealment of current communication.

[0048] Optionally, the key distribution method based on full-optical hiding provided by the embodiments of the present application has two receiving ends, wherein the first receiving end directly receives the coupled and processed optical pulse signal, and the second receiving end receives the coupled and processed optical pulse signal via a transmission link.

[0049] Optionally, the key distribution method based on full-optical hiding provided by the embodiments of the present application has two receiving ends, wherein the first receiving end directly receives the coupled and processed optical pulse signal, and the second receiving end receives the coupled and processed optical pulse signal via a transmission link.

[0050] The dispersion processing includes processing the processed optical pulse signal into a noise-like signal in the time domain, and changing the frequency domain of the noise-like signal into a noise-like spectrum by controlling the laser parameters.

[0051] After the receiving end receives the dispersion-processed optical pulse signal, the dispersion-processed optical pulse signal is obtained by a dispersion compensation module.

[0052] Specifically, the receiving end can have two receiving ends, wherein the first receiving end directly receives the coupled and processed optical pulse signal and performs extraction processing on the signal, and the second receiving end is connected to the optical coupler through a transmission link, and the transmission link can be eavesdropped by a third party during transmission. Therefore, after the optical coupler generates the coupled and processed optical pulse signal, the optical pulse is widened by a dispersion module, and the widened signal is transmitted through the transmission link. The dispersion processing includes processing the processed optical pulse signal into a noise-like signal in the time domain, and changing the frequency domain of the noise-like signal into a noise-like spectrum by controlling the laser parameters. Thus, a noise-like signal is formed, and the key distribution process is hidden by this method. During the transmission process, the transmission signal is similar to the noise signal, and the third-party eavesdropper cannot notice the transmission signal, and the signal hiding is completed. When the signal reaches the second receiving end, the signal is first restored into the coupled and processed optical pulse signal by a dispersion compensation module. The subsequent processing steps are the same as the processing process after the first receiving end receives the signal.

[0053] Optionally, the key distribution method based on all-optical concealment provided in the embodiment of the present application modulates the processed sinusoidal microwave signal into a laser, and outputs the modulated sinusoidal microwave signal in the form of optical pulses, and the phase difference between the output optical pulses is random.

[0054] Optionally, the key distribution method based on all-optical concealment provided in the embodiment of the present application has a transmission link of 25 km.

[0055] Specifically, the distance of the transmission link can be determined according to actual engineering needs, and is not fixed as 25 km.

[0056] Optionally, the key distribution method based on all-optical concealment provided in the embodiment of the present application filters and suppresses the noise in the received optical pulse signal at the receiving end, extracts the phase information of the filtered and suppressed optical pulse signal, specifically including filtering and suppressing the common signal and noise in the link through an optical filter, and extracting the phase information in the received optical pulse signal through an AMZI module.

[0057] Specifically, Figure 3 The receiving end structure schematic diagram of the all-optical concealment key distribution device provided in the embodiment of the present application is shown in FIG. 2. Figure 3 As shown in FIG. 2, at the receiving end, the optical signal output from the optical coupler is filtered and suppressed through an optical filter to filter and suppress the common signal and noise signal, and then transmitted to an AMZI module for restoration. The AMZI module is an asymmetric MZI module, and then the optical pulse phase information is extracted and balanced through a balanced detection module. In the extraction process, first, an amplitude random electric pulse signal is obtained, and the amplitude random electric pulse signal is filtered and analog-digital converted in an optoelectronic detection device to convert the optical signal into an electric signal and then into a digital signal. Finally, the transmitted digital key distributed by the all-optical concealment is obtained in a key extraction module.

[0058] In one embodiment, the key distribution method based on all-optical concealment provided in the present application is used for key transmission, and the transmission link of the second receiving end is a 25 km transmission link. The key waveform extracted in the key by the first receiving end is shown in FIG. 3. Figure 4 The key waveform extracted in the key by the second receiving end is shown in FIG. 4. Figure 5 After the correlation analysis of the key waveform extracted in the key by the first receiving end and the key waveform extracted in the key by the second receiving end, the cross-correlation function schematic diagram of the output waveforms of the first receiving end and the second receiving end is shown in FIG. 5. Figure 6 As shown in FIG. 5, the signal transmitted by the key distribution method based on all-optical concealment provided in the present application is still not distorted after long-distance transmission, and has good anti-interference performance.

[0059] A third party intercepts the spectrum signal on the transmission link, such as Figure 7 As shown in the figure, the signal waveform obtained according to the intercepted spectrum signal is as shown in the figure Figure 8 It can be seen that it is completely irrelevant to the waveform analyzed by the second receiving end, and the intercepted signal is covered by the optical signal due to the concealment performance of the all-optical hiding device. The concealment performance of the all-optical hiding device is embodied. The current communication demand for information security and high concealment is met.

[0060] The application also provides a key distribution device based on all-optical hiding, comprising:

[0061] A microwave signal source module is configured to generate a sinusoidal microwave signal and process the sinusoidal microwave signal through a microwave amplifier;

[0062] A laser module is configured to modulate the processed sinusoidal microwave signal into a laser by combining a preset bias current, and output the modulated sinusoidal microwave signal in the form of an optical pulse signal;

[0063] An optical coupler module is configured to filter the optical pulse signal based on an optical filter, process the filtered optical pulse signal through an optical coupler, and send the processed optical pulse signal to a receiving end;

[0064] A band-pass filter module is configured to filter and suppress noise in the received optical pulse signal by the receiving end;

[0065] An AMZI module is configured to extract phase information of the filtered and suppressed optical pulse signal, convert a phase difference of the optical pulse signal into an amplitude difference of an electrical pulse signal, and obtain a corresponding electrical pulse signal;

[0066] An analog-to-digital conversion module is configured to filter and analog-to-digital convert the electrical pulse signal, and obtain a key waveform.

[0067] The application also provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the steps of the above method. The computer-readable storage medium can include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a micro drive, and a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic card or an optical card, a nanosystem (including a molecular memory IC), or any type of medium or device suitable for storing instructions and / or data.

[0068] It should be noted that, for the foregoing method embodiments, the sequences of the described actions are not necessarily required to achieve the objects of the application, and certain steps can be performed in other sequences or even concurrently. Additionally, the described embodiments are merely provided as examples, and not all of the actions described are necessarily required to achieve desired results.

[0069] In the above embodiments, the description of each embodiment is focused on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0070] In several embodiments provided by the present application, it should be understood that the disclosed apparatus can be implemented in other manners. For example, the described embodiments of the apparatus are merely schematic, and the division of the units is merely logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0071] The units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place or distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0072] In addition, each functional unit in the embodiments of the present application can be integrated in a processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of a software functional unit.

[0073] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable memory. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a memory and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The aforementioned memory includes: a U disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0074] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by programs instructing relevant hardware, and the programs can be stored in a computer readable memory, which can include a flash disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, etc.

[0075] The above is only exemplary embodiments of the present disclosure, and cannot limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure are still within the scope of the present disclosure. Those skilled in the art will easily think of embodiments of the present disclosure after considering the specification and practicing the disclosure herein. The present application is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not described in the present disclosure. The specification and examples are only considered as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

[0076] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0077] Those skilled in the art readily understand that the above only describes preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for key distribution based on all-optical concealment, characterized in that, The method comprises the following steps: generating a sinusoidal microwave signal, processing the sinusoidal microwave signal through a microwave amplifier, modulating the processed sinusoidal microwave signal into a laser by combining a preset bias current, and outputting the modulated sinusoidal microwave signal in the form of an optical pulse signal; after filtering the optical pulse signal based on an optical filter, processing the coupled optical pulse signal through an optical coupler, and sending the coupled optical pulse signal to a receiving end; the receiving end filters and suppresses the noise in the received optical pulse signal, extracts the phase information of the filtered and suppressed optical pulse signal, converts the phase difference of the optical pulse signal into the amplitude difference of an electric pulse signal, obtains the corresponding electric pulse signal, filters and digitizes the electric pulse signal, and obtains a key waveform; the receiving end has two receiving ends, one of which directly receives the coupled optical pulse signal, and the other of which receives the coupled optical pulse signal through a transmission link; before being transmitted through the transmission link, the coupled optical pulse signal is dispersed by a dispersion module; the dispersion processing includes processing the processed optical pulse signal into a noise-like signal in the time domain, and changing the frequency domain into a noise-like spectrum by controlling the laser parameters; after the receiving end receives the dispersed optical pulse signal, the dispersed optical pulse signal is obtained through a dispersion compensation module.

2. The all-optical hiding-based key distribution method according to claim 1, wherein, The output optical pulse signal is random.

3. The all-optical hiding-based key distribution method according to claim 1, wherein, The transmission link is a 25km transmission link.

4. The all-optical hiding-based key distribution method according to claim 1, wherein, The receiving end filters and suppresses the noise in the received optical pulse signal, extracts the phase information of the filtered and suppressed optical pulse signal, specifically includes filtering and suppressing the common signal and noise in the link through an optical filter, and extracting the phase information of the received optical pulse signal through an AMZI module.

5. A key distribution apparatus based on all-optical concealment, characterized by, The method comprises the following steps: a microwave signal source module is used to generate a sinusoidal microwave signal, and the sinusoidal microwave signal is processed through a microwave amplifier; a laser module is used to modulate the processed sinusoidal microwave signal into a laser by combining a preset bias current, and output the modulated sinusoidal microwave signal in the form of an optical pulse signal; an optical coupler module is used to filter the optical pulse signal based on an optical filter, process the coupled optical pulse signal through an optical coupler, and send the coupled optical pulse signal to a receiving end; a band-pass filter module is used to filter and suppress the noise in the received optical pulse signal by the receiving end; an AMZI module is used to extract the phase information of the filtered and suppressed optical pulse signal, convert the phase difference of the optical pulse signal into the amplitude difference of an electric pulse signal, and obtain the corresponding electric pulse signal; an analog-to-digital conversion module is used to filter and digitize the electric pulse signal, and obtain a key waveform.

6. A key distribution apparatus based on all-optical concealment, characterized by, A computer program product comprising at least one storage medium to store the computer program readable by a processor and a computer program, which, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 4.

7. A storage medium, characterized by A computer program product comprising at least one storage medium to store the computer program readable by a processor and a computer program, which, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 4.

8. A computer program product comprising a computer program, characterized in that, The computer program, which, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 4.

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