Point-mode sensing encryption method and system based on random fiber laser

Abstract

The invention relates to a point-mode sensing encryption method and system based on a random fiber laser, which is applied to the field of fiber lasers, and comprises the following steps: generating original pump light through a pump light source in the random fiber laser; adjusting the power of the original pump light to exceed a preset threshold value, and outputting a chaotic signal; collecting the chaotic signal through an oscilloscope, and calculating and obtaining a random bit stream according to the collected chaotic signal; sensing data are detected and collected through a Bragg grating and a spectrograph, and the sensing data comprise but not limited to speed, temperature and strain data; and encrypting the sensing data by adopting the random bit stream to generate ciphertext data, and transmitting the ciphertext data to a preset receiving end. The technical effect of the invention is that the security of data encryption is improved.

Description

Technical Field

[0001] This application relates to the technical field of fiber lasers, and particularly to a point-type sensing encryption method and system based on a random fiber laser. Background Art

[0002] With the popularization of the Internet of Things (IoT) and intelligent devices, sensing technology has been increasingly widely used in fields such as environmental monitoring, industrial control, and medical health. The security of sensing data has become a key issue, especially in scenarios involving sensitive information (such as personal privacy and military data). Traditional encryption technologies usually rely on a pseudo-random number generator (PRNG), which uses an algorithm to generate a seed source. The pseudo-random number generator (PRNG) generates a key stream based on the seed source to achieve encryption.

[0003] The method of encrypting by relying on a pseudo-random number generator has a high generation rate. However, there is a risk that the pseudo-random number generator encryption can be cracked, resulting in low security of data transmission. Summary of the Invention

[0004] To help solve the problem that there is a risk that the pseudo-random number generator can be cracked, resulting in low security of data transmission, this application provides a point-type sensing encryption method and system based on a random fiber laser.

[0005] In a first aspect, this application provides a point-type sensing encryption method based on a random fiber laser, adopting the following technical solution: The method includes:

[0006] Generating original pump light through a pump light source in a random fiber laser;

[0007] Adjusting the power of the original pump light to exceed a preset threshold to output a chaotic signal;

[0008] Collecting the chaotic signal through an oscilloscope, and calculating and obtaining a random bit stream according to the collected chaotic signal;

[0009] Detecting and collecting sensing data through a Bragg grating and a spectrometer, where the sensing data includes but is not limited to velocity, temperature, and strain data;

[0010] Using the random bit stream to encrypt the sensing data to generate ciphertext data, and transmitting the ciphertext data to a preset receiving end.

[0011] In a specific feasible implementation, the step of collecting the chaotic signal through an oscilloscope and calculating and obtaining a random bit stream according to the collected chaotic signal includes:

[0012] Collecting the chaotic signal through an oscilloscope at a preset time interval, and obtaining a current chaotic signal and a delayed chaotic signal;

[0013] Perform analog-to-digital conversion on the current chaotic signal and the delayed chaotic signal, and generate a current bit matrix and a delayed bit matrix;

[0014] Perform exclusive-OR calculation on the current bit matrix and the delayed bit matrix, and generate random bits;

[0015] Set the random bits calculated within a preset time period as a random bit stream.

[0016] In a specific feasible implementation, the encrypting the sensing data using the random bit stream to generate ciphertext data includes:

[0017] Perform exclusive-OR calculation on the random bit stream and the sensing data to generate ciphertext data.

[0018] In a specific feasible implementation, the wavelength of the original pump light is 1455 nm.

[0019] In a specific feasible implementation, the bandwidth of the chaotic signal is 38 GHz.

[0020] In a specific feasible implementation, the generation rate of the random bit stream is 570 Gbps / s.

[0021] In a second aspect, the present application provides a point-type sensing encryption system based on a random fiber laser, adopting the following technical solution: The system includes: a chaotic signal generation module, a signal acquisition module, and a data processing module;

[0022] The chaotic signal generation module is used to generate original pump light, and adjust the power of the original pump light to exceed a preset threshold to generate a chaotic signal;

[0023] The signal acquisition module is used to collect the sensing data and the time series of the chaotic signal, and transmit the collected sensing data and the time series of the chaotic signal to the data processing module;

[0024] The data processing module is used to receive the sensing data and the time series of the chaotic signal, calculate and generate a random bit stream, and encrypt the sensing data using the random bit stream to generate ciphertext data.

[0025] In a specific feasible implementation, the chaotic signal generation module includes a pump light source, an optical isolator, a wavelength division multiplexer, a Bragg grating, a first single-mode fiber, a second single-mode fiber, an erbium-doped fiber, and a photodetector;

[0026] The pump light source is used to generate original pump light;

[0027] The optical isolator is connected to the pump light source, and is used to receive the original pump light and control the direction of optical transmission;

[0028] The wavelength division multiplexer is connected to the optical isolator, and is used to distinguish different optical signals according to the wavelength of light;

[0029] The Bragg grating is connected to the wavelength division multiplexer, and is used to reflect light of a specific wavelength;

[0030] The first single-mode optical fiber is connected to the wavelength division multiplexer, and is used to receive the light output by the wavelength division multiplexer and stimulate stimulated Raman scattering;

[0031] The erbium-doped optical fiber is connected to the first single-mode optical fiber, and is used to provide gain;

[0032] The second single-mode optical fiber is connected to the erbium-doped optical fiber, and is used to stimulate Rayleigh scattering to provide random feedback;

[0033] The optical detector is connected to the second single-mode optical fiber, and is used to convert the laser signal finally output by the second single-mode optical fiber into a corresponding electrical signal, and the converted electrical signal is a chaotic signal.

[0034] In a specific feasible embodiment, the first single-mode optical fiber is a 20-km single-mode optical fiber, and the second single-mode optical fiber is a 10-km single-mode optical fiber.

[0035] In a specific feasible embodiment, the signal acquisition module includes a spectrometer and an oscilloscope;

[0036] The spectrometer is used to receive the chaotic signal, detect the change in the central wavelength of the optical signal in the chaotic signal, and convert it into corresponding sensing data;

[0037] The oscilloscope is used to receive and acquire the time series of the chaotic signal.

[0038] In summary, the present application has the following beneficial technical effects:

[0039] 1. A chaotic signal is generated by a random fiber laser. The chaotic signal has unpredictability and non-replicability. Encrypting the sensing data with the chaotic signal can improve the security during the transmission of the sensing data, and the encrypted data is difficult to be cracked;

[0040] 2. The generation rate of the random bit stream in the present application is 570 Gbps / s, which is suitable for the scenario of real-time encryption of large amounts of data;

[0041] 3. The designed system architecture in the present application does not involve complex cavity design, is easy to implement and is easy to integrate into the existing communication system;

[0042] 4. In the system of the present application, the combination of random number generation and fiber Bragg grating sensing can achieve the functional integration of detection, encryption, transmission, and decryption. Description of the Drawings

[0043] Figure 1 is a schematic diagram of a point-type sensing encryption system based on a random fiber laser in an embodiment of the present application;

[0044] Figure 2 is a flowchart of a point-type sensing encryption method based on a random fiber laser in an embodiment of the present application;

[0045] Figure 3 are the time-domain diagram and statistical distribution diagram of the chaotic signal generated in an embodiment of the present application. Detailed Description of the Embodiment

[0046] The following is a further detailed description of the present application in conjunction with Figures 1 - 3 to further illustrate the present application in detail.

[0047] An embodiment of the present application discloses a point-type sensing encryption method based on a random fiber laser. By using this method, a chaotic signal can be generated through the random distributed feedback of Rayleigh scattering by a random fiber laser (RFL), which has high randomness and non-replicability, and it can also achieve high-precision point-type measurement of multiple physical quantities (such as velocity, temperature, strain, etc.) through a fiber Bragg grating.

[0048] With the popularization of the Internet of Things (IoT) and intelligent devices, sensing technology is increasingly widely used in fields such as environmental monitoring, industrial control, and medical health. The security of sensing data has become a key issue, especially in scenarios involving sensitive information (such as personal privacy, military data). Traditional encryption technologies usually rely on a pseudo-random number generator (PRNG), which uses an algorithm to generate a seed source, and the pseudo-random number generator (PRNG) generates a key stream based on the seed source to achieve encryption. The encryption method relying on the pseudo-random number generator has a high generation rate. However, the pseudo-random number generator has the risk of being cracked, resulting in low security of data transmission; in addition, traditional encryption algorithms may face challenges in terms of computational complexity and energy consumption in resource-constrained IoT devices.

[0049] To address the risk of being cracked in pseudo-random number generator encryption, users may choose a true random number generator (TRNG) for encryption. The true random number generator (TRNG) usually relies on physical entropy sources (such as thermal noise, chaotic circuits). However, TRNG encryption is usually limited by a low generation rate or a complex structure and is difficult to be widely applied in practical applications. Therefore, to solve the problem that the pseudo-random number generator encryption method is easily cracked and has low security, the present application provides a point-type sensing encryption method based on a random fiber laser.

[0050] Referring toFigure 1 , which is a schematic diagram of a point - type sensing and encryption system based on a random fiber laser in an embodiment of the present application. The point - type sensing and encryption system based on a random fiber laser includes a chaotic signal generation module, a signal acquisition module, and a data processing module.

[0051] The chaotic signal generation module is used to generate an original pump light and adjust the power of the original pump light to exceed a preset threshold to generate a chaotic signal. Among them, the chaotic signal generation module can be understood as a random fiber laser. Referring to Figure 1 , it specifically includes a pump light source, an optical isolator, a wavelength division multiplexer, a Bragg grating, a first single - mode fiber, a second single - mode fiber, an erbium - doped fiber, and a photodetector. The pump light source is used to generate the original pump light; the optical isolator is connected to the pump light source and is used to receive the original pump light and control the direction of light transmission; the wavelength division multiplexer is connected to the optical isolator and is used to distinguish different optical signals according to the wavelength of light; the Bragg grating is connected to the wavelength division multiplexer and is used to reflect light of a specific wavelength; the first single - mode fiber is connected to the wavelength division multiplexer and is used to receive the light output by the wavelength division multiplexer and stimulate stimulated Raman scattering. Among them, the first single - mode fiber is a 20 - km single - mode fiber; the erbium - doped fiber is connected to the first single - mode fiber and is used to provide gain; the second single - mode fiber is connected to the erbium - doped fiber and is used to provide random feedback. Among them, the second single - mode fiber is a 10 - km single - mode fiber; the photodetector is connected to the second single - mode fiber and is used to convert the laser signal finally output by the second single - mode fiber into a corresponding electrical signal, and the converted electrical signal is a chaotic signal.

[0052] Specifically, the chaotic signal is generated by a random fiber laser, which mainly includes three parts: a pump light source, gain, and a resonator. In the embodiment of the present application, a 10-km single-mode fiber and a Bragg grating form the resonator, and a 20-km single-mode fiber and an erbium-doped fiber provide the gain. The principle of generating the chaotic signal is that the pump light source generates an original pump light of 1455 nm, which is injected into the 20-km single-mode fiber through an optical isolator and a wavelength division multiplexer to excite stimulated Raman scattering. The function of the optical isolator is to control the unidirectional transmission of the pump light and prevent the reflection or propagation of the reverse light, thereby protecting the light source and the system stability. The laser output from the 20-km single-mode fiber is injected into the erbium-doped fiber, and the erbium ions in the erbium-doped fiber provide gain amplification. The laser after gain amplification is injected into the 10-km single-mode fiber, and the 10-km single-mode fiber excites Rayleigh scattering to provide random feedback. After the laser is reflected, it is transmitted through the erbium-doped fiber and the 20-km single-mode fiber to the wavelength division multiplexer, and then transmitted through the wavelength division multiplexer to the Bragg grating. The Bragg grating selectively reflects the laser of a specific wavelength, and then circulates and repeats injecting into the 20-km single-mode fiber and the erbium-doped fiber to excite stimulated Raman scattering and erbium ion gain, and injecting into the 10-km single-mode fiber to excite Rayleigh scattering to provide random feedback; when the gain in the resonator is greater than the total loss, random laser is generated. Since the pump light power is greater than the preset threshold, the strong self-chaotic state of the random fiber laser is excited. It can also be understood that the generated random laser interacts in the resonator and then outputs through the 10-km single-mode fiber. After passing through a photodetector, the laser signal is converted into a corresponding electrical signal to generate the final chaotic signal.

[0053] The signal acquisition module is used to collect the time series of the sensing data and the chaotic signal, and transmit the time series of the collected sensing data and the chaotic signal to the data processing module. Specifically, the signal acquisition module includes a spectrometer and an oscilloscope. The spectrometer is used to receive the chaotic signal, detect the change of the central wavelength of the optical signal in the chaotic signal, and convert it into corresponding sensing data; the oscilloscope is used to receive and collect the time series of the chaotic signal. It should be noted that the spectrometer can detect the change of the central wavelength in real time, so as to monitor the sensing data; the detection point is the Bragg grating, and the output random laser appears as an output optical signal with a central wavelength of 1550 nm on the spectrum. Taking the Bragg grating as the detection device, taking the detection of temperature as an example, when the Bragg grating senses a change in the external temperature, for example, it will cause a linear drift of the central wavelength on the spectrum, thereby realizing the acquisition of temperature sensing data. The speed data and strain data are the same.

[0054] The data processing module is used to receive the time series of the sensing data and the chaotic signal, calculate and generate a random bit stream, and use the random bit stream to encrypt the sensing data to generate ciphertext data. It should be noted that the data processing module mainly runs on the upper computer side. Figure 1Not shown in the figure, the signal acquisition module transmits the acquired data to the host computer, and the host computer performs corresponding random number generation operations and encryption operations upon receiving the data.

[0055] Refer to Figure 2 , the point - type sensing encryption method based on a random fiber laser includes the following steps:

[0056] S10, generating an original pump light through a pump light source in the random fiber laser.

[0057] Specifically, the embodiment of the present application is implemented based on a random fiber laser. In the embodiment of the present application, an erbium - Raman hybrid gain random fiber laser (ERRFL) is adopted. The random fiber laser contains a pump light source, and an original pump light of 1455 nm is generated through the pump light source.

[0058] S20, adjusting the power of the original pump light to exceed a preset threshold to output a chaotic signal.

[0059] Specifically, adjusting the output power of the original pump light to reach above the preset threshold to stimulate the strong self - chaotic state of the random fiber laser, and finally output a chaotic signal of 38 GHz. The chaotic signal has high randomness, unpredictability, and non - reproducibility, thereby improving the security of data and being difficult to be cracked. Refer to Figure 3 , which is the time - domain and statistical distribution diagram of the chaotic signal generated in the embodiment of the present application.

[0060] S30, collecting the chaotic signal through an oscilloscope and calculating and obtaining a random bit stream based on the collected chaotic signal.

[0061] Specifically, collecting the time series of the chaotic signal through an oscilloscope and converting the time series into a random bit stream through calculation to generate true random numbers. Among them, the generation rate of the random bit stream is 570 Gbps / s.

[0062] S40, detecting and collecting sensing data through a Bragg grating and a spectrometer. The sensing data includes but is not limited to velocity, temperature, and strain data.

[0063] Specifically, using a Bragg grating as a detection device, the sensing data to be measured can be detected. The sensing data can include but is not limited to velocity, temperature, and strain data. Taking temperature as an example, when the Bragg grating senses the change in the external temperature, it will cause a linear drift in the central wavelength on the spectrum, thereby realizing the detection of temperature sensing data. The change in the central wavelength can be detected in real - time through a spectrometer. In the embodiment of the present application, point - type sensing is adopted, which can also be understood as only using a Bragg grating (FBG) as a sensing component.

[0064] S50 encrypts the sensing data with a random bit stream to generate ciphertext data, and transmits the ciphertext data to a preset receiving end.

[0065] Specifically, the collected sensing data is encrypted with the generated random bit stream to generate ciphertext data, and the generated ciphertext data is transmitted to a preset receiving end. The specific encryption method can perform an exclusive-or calculation on the random bit stream and the sensing data to generate ciphertext data. After receiving the ciphertext data, the receiving end can perform an exclusive-or decryption on the transmitted ciphertext with the same random number to restore the original information.

[0066] In one embodiment, the method of collecting a chaotic signal by an oscilloscope and calculating and obtaining a random bit stream based on the collected chaotic signal can be specifically implemented as follows:

[0067] First, the oscilloscope is used to collect the chaotic signal at a preset time interval, and the current chaotic signal and the delayed chaotic signal are obtained; the current chaotic signal and the delayed chaotic signal are subjected to analog-to-digital conversion to generate a current bit matrix and a delayed bit matrix. Specifically, 8-bit analog-to-digital conversion can be performed. Then, an exclusive-or calculation is performed on the current bit matrix and the delayed bit matrix to generate a random bit; finally, the random bits calculated within a preset time period are set as the random bit stream.

[0068] In the embodiment of the present application, a chaotic signal is generated by a random fiber laser. The chaotic signal has unpredictability and non-replicability. Encrypting the sensing data with the chaotic signal can improve the security of the sensing data during transmission, and the encrypted data is difficult to be cracked. Secondly, in the present application, the generation rate of the random bit stream is 570 Gbps / s, which is suitable for the scenario of real-time encryption of a large amount of data. In addition, the system architecture designed in the present application does not involve complex cavity design, is easy to implement and is easy to integrate into the existing communication system; at the same time, in the system of the present application, the random number generation is combined with the fiber Bragg grating sensing, and the functions of detection, encryption, and transmission can be integrated.

[0069] Figure 2 It is a schematic flow chart of a point-type sensing encryption method based on a random fiber laser in an embodiment. It should be understood that although Figure 2 each step in the flow chart is shown in sequence according to the indication of the arrow, these steps are not necessarily executed in the order indicated by the arrow; unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders; and Figure 2At least some of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed and completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least some of the other steps or the sub-steps or stages of the other steps.

[0070] This specific embodiment is only an interpretation of the present invention and does not limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A point-type sensing encryption method based on a random fiber laser, characterized in that: The method includes: generating original pump light through a pump light source in a random fiber laser; adjusting the power of the original pump light to exceed a preset threshold to output a chaotic signal; collecting the chaotic signal through an oscilloscope and calculating and obtaining a random bit stream based on the collected chaotic signal; detecting and collecting sensing data through a Bragg grating and a spectrometer, where the sensing data includes but is not limited to velocity, temperature, and strain data; encrypting the sensing data with the random bit stream to generate ciphertext data and transmitting the ciphertext data to a preset receiving end.

2. The method according to claim 1, wherein: The collecting the chaotic signal through an oscilloscope and calculating and obtaining a random bit stream based on the collected chaotic signal includes: using the oscilloscope to collect the chaotic signal at a preset time interval and obtaining the current chaotic signal and the delayed chaotic signal; performing analog-to-digital conversion on the current chaotic signal and the delayed chaotic signal and generating a current bit matrix and a delayed bit matrix; performing exclusive-OR calculation on the current bit matrix and the delayed bit matrix and generating a random bit; setting the random bits calculated within a preset time period as the random bit stream.

3. The method according to claim 1, wherein: The encrypting the sensing data with the random bit stream to generate ciphertext data includes: performing exclusive-OR calculation on the random bit stream and the sensing data to generate ciphertext data.

4. The method according to claim 1, wherein: The wavelength of the original pump light is 1455 nm.

5. The method according to claim 1, wherein: The bandwidth of the chaotic signal is 38 GHz.

6. The method according to claim 1, wherein: The generation rate of the random bit stream is 570 Gbps / s.

7. A point-type sensing encryption system based on a random fiber laser, which is used to implement the point-type sensing encryption method based on a random fiber laser according to any one of claims 1-6, and is characterized in that: The system includes: a chaotic signal generation module, a signal acquisition module, and a data processing module; The chaotic signal generation module is used to generate original pump light and adjust the power of the original pump light to exceed a preset threshold to generate a chaotic signal; The signal acquisition module is used to collect the sensing data and the time series of the chaotic signal and transmit the collected sensing data and the time series of the chaotic signal to the data processing module; The data processing module is used to receive the sensing data and the time series of the chaotic signal, calculate and generate a random bit stream, and encrypt the sensing data with the random bit stream to generate ciphertext data.

8. The system according to claim 7, wherein: The chaotic signal generation module includes a pump light source, an optical isolator, a wavelength division multiplexer, a Bragg grating, a first single-mode fiber, a second single-mode fiber, an erbium-doped fiber, and a photodetector; The pump light source is used to generate original pump light; The optical isolator is connected to the pump light source and is used to receive the original pump light and control the direction of light transmission; The wavelength division multiplexer is connected to the optical isolator and is used to distinguish different optical signals according to the wavelength of light; The Bragg grating is connected to the wavelength division multiplexer and is used to reflect light of a specific wavelength; The first single-mode fiber is connected to the wavelength division multiplexer and is used to receive the light output by the wavelength division multiplexer and stimulate stimulated Raman scattering; The erbium-doped fiber is connected to the first single-mode fiber and is used to provide gain; The second single-mode fiber is connected to the erbium-doped fiber and is used to stimulate Rayleigh scattering to provide random feedback; The photodetector is connected to the second single-mode optical fiber and is used to convert the laser signal finally output by the second single-mode optical fiber into a corresponding electrical signal, and the converted electrical signal is a chaotic signal.

9. The system according to claim 7, wherein: The first single-mode optical fiber is a 20-km single-mode optical fiber, and the second single-mode optical fiber is a 10-km single-mode optical fiber.

10. The system according to claim 7, characterized in that: The signal acquisition module includes a spectrometer and an oscilloscope; The spectrometer is used to receive the chaotic signal, detect the change in the central wavelength of the optical signal in the chaotic signal, and convert it into corresponding sensing data; The oscilloscope is used to receive and collect the time series of the chaotic signal.

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