CN117591075B

CN117591075B - Random number generation method, device and equipment based on star light coherence

Info

Publication number: CN117591075B
Application number: CN202410074028.3A
Authority: CN
Inventors: 孙建锋; 李皓然; 郑磊; 徐晓帆
Original assignee: Shanghai Satellite Internet Research Institute Co ltd
Current assignee: Shanghai Satellite Internet Research Institute Co ltd
Priority date: 2024-01-18
Filing date: 2024-01-18
Publication date: 2024-04-09
Anticipated expiration: 2044-01-18
Also published as: CN117591075A

Abstract

The application provides a random number generation method, device and equipment based on star light coherence, which relate to the technical field of information security and are used for improving random number generation efficiency. The method is applied to a random number generation device, and the random number generation device comprises an interferometer and an image processor; the method comprises the following steps: determining that the optical path difference between the first light beam and the second light beam is larger than a preset coherence length, wherein the light sources of the first light beam and the second light beam are starlight; acquiring at least one frame of target image generated by the first light beam and the second light beam through the interferometer by using an image processor, wherein each frame of target image in the at least one frame of target image is related to the phase fluctuation of the light source and the initial phase difference between the first light beam and the second light beam; selecting a first number of target pixel points from each frame of target image of at least one frame of target image, and generating a random sequence corresponding to each frame of target image according to the image information of the target pixel points, wherein the random sequence comprises at least one random number.

Description

Random number generation method, device and equipment based on star light coherence

Technical Field

The present disclosure relates to the field of information security technologies, and in particular, to a method, an apparatus, and a device for generating a random number based on star optical coherence.

Background

Random numbers are widely used in fields such as simulation, data encryption, and statistical sampling based on their unpredictability, unrepeatability, and statistical invasiveness. Current random numbers fall into two categories: pseudo-random numbers and true random numbers. The pseudo-random number is generated by a specific mathematical algorithm, so that under the condition that the current computing capacity is continuously enhanced, the pseudo-random number is possibly broken, and the safety of the pseudo-random number cannot be ensured. Whereas true random numbers are generated based on the randomness of an unpredictable physical system, true random numbers have true unpredictability compared to pseudo random numbers. Therefore, obtaining true random numbers and using true random numbers as key sources have become a current trend.

Currently, various special light sources have been used in the related research for extracting true random numbers, wherein the sun is one of the most readily available light sources, and the sun is also used for generating true random numbers. The current method for generating random numbers by sunlight is as follows: detecting the light intensity of sunlight, converting the light intensity into information in frequency or polarization and the like, and generating random numbers according to the frequency information or the polarization information. In this random number generation method, the process of converting the light intensity into frequency information or polarization information needs a lot of equipment to be realized, and a complex preparation procedure is also needed to be completed, so that the random number generation efficiency is low.

Disclosure of Invention

The application provides a random number generation method, device and equipment based on star light coherence, which are used for improving random number generation efficiency.

In a first aspect, an embodiment of the present application provides a method for generating a random number based on star light coherence, which is applied to a random number generating device, where the random number generating device includes an interferometer and an image processor; the method comprises the following steps: determining that the optical path difference between a first light beam and a second light beam is larger than a preset coherence length, wherein the light sources of the first light beam and the second light beam are starlight; acquiring, with the image processor, at least one frame of target images generated by the first and second beams through the interferometer, each frame of target image in the at least one frame of target images being related to a phase fluctuation of the light source and an initial phase difference between the first and second beams; selecting a first number of target pixel points from each frame of target image of the at least one frame of target image, and generating a random sequence corresponding to each frame of target image according to the image information of the target pixel points, wherein the random sequence comprises at least one random number.

In this embodiment of the present application, when the random number generating device determines that the optical path difference between the first beam and the second beam is greater than the coherence length, it may be determined that there is no coherence between the two beams, and since the light sources of the first beam and the second beam are starlight, the phase fluctuation of the starlight and the initial phase difference between the first beam and the second beam are random, at least one frame of target image generated by the first beam and the second beam through the interferometer is an irregular image, and further, the random number generating device may generate a random number with better randomness according to the image information of the irregular image. That is, the embodiment of the present application generates random numbers with better randomness by using randomness of the phase difference between the first light beam and the second light beam when there is no coherence between the first light beam and the second light beam.

Compared with the true random number generation method in the prior art, in the first embodiment of the invention, the light sources of the first light beam and the second light beam are starlight, and the starlight is collected without special device, i.e. the light sources are easy to obtain; second, according to the embodiment of the application, the random number is generated by utilizing the image information of the irregular image generated when the coherence does not exist between the first light beam and the second light beam, the random number is not required to be converted into frequency or amplitude information after light intensity is acquired through a plurality of devices, the random number is regenerated, the random extraction process is simpler, more convenient and faster, and the random number generation efficiency is improved.

In addition, in the embodiment of the application, a plurality of frames of images can be obtained in real time, and each pixel point in each frame of image can generate a random number, so that the random number generation method provided by the application can generate random numbers in batches in real time, and the random number generation efficiency is further improved.

In one possible implementation manner, selecting a first number of target pixels from each frame of target image of the at least one frame of target image, and generating a random sequence corresponding to each frame of target image according to image information of the target pixels, including: determining the luminosity value of each target pixel point; determining a random number corresponding to each target pixel point based on a difference value between the luminosity value of each target pixel point and an interference value, wherein the interference value is used for representing an average value of light intensity in each frame of target image; and forming a random sequence of each frame of target image according to the random number corresponding to the target pixel point in each frame of target image.

In this embodiment, since at least one frame of the target image is an irregular image, the image information of the irregular image is random, and in this case, the intensity of light of each pixel point in each frame of the target image is different, so that the random number generating device determines the difference between the luminosity value and the interference value of each target pixel point as the random number corresponding to the target pixel point, simplifying the random number generating process, and being beneficial to improving the random number generating efficiency.

In one possible implementation manner, before determining the random number corresponding to each target pixel point based on the difference between the luminosity value and the interference value of each target pixel point, the method further includes: acquiring the luminosity value of each pixel point in each frame of target image; and determining the interference value of each frame of target image according to the average value of the luminosity values of all pixel points in each frame of target image.

In this embodiment, in order to make the image feature of each pixel more obvious, in this embodiment of the present application, the average value of the luminosity values of each frame of the target image is used as the interference value of each frame of the target image, so that the influence of the interference value can be removed when determining the random number of each target pixel.

In one possible implementation, the image processor includes a photosensitive element, where a photosensitive plane of the photosensitive element is disposed relatively vertically from the interferometer at a first preset distance, so that the first light beam and the second light beam can irradiate on the photosensitive plane after passing through the interferometer; acquiring, with the image processor, at least one frame of target image generated by the first and second beams through the interferometer, comprising: detecting, by the photosensitive element, an intensity of light generated by the first light beam and the second light beam at each position of the photosensitive plane by the interferometer at each moment, the intensity of light being related to a phase fluctuation of the light source and an initial phase difference between the first light beam and the second light beam; and converting the light intensity of each position on the photosensitive plane at each moment into a digital image signal to obtain at least one frame of target image.

In this embodiment, since the light intensities of the first light beam and the second light beam at each position of the light sensing plane of the light sensing element are also random based on the influence of the phase fluctuation of the light source and the randomness of the initial phase difference between the first light beam and the second light beam when the optical path difference between the first light beam and the second light beam is greater than the preset coherence length, the digital image signal also has randomness after the light sensing element converts the light intensity into the data image signal.

In one possible embodiment, the interferometer comprises a double slit plate; determining that the optical path difference between the first light beam and the second light beam is greater than a preset coherence length comprises: when the rotation angle of the double slit plate is within a preset angle range, determining that the optical path difference between the first light beam and the second light beam is larger than the coherence length; alternatively, the interferometer includes a double slit plate and a retardation plate provided between the double slit plate and the photosensitive element so that either one of the first light beam and the second light beam can be irradiated on the photosensitive plane or the light screen after passing through the retardation plate; determining that the optical path difference between the first light beam and the second light beam is greater than a preset coherence length comprises: and when the distance between the delay piece and the double slit plate is larger than a second preset distance, determining that the optical path difference between the first light beam and the second light beam is larger than the coherence length.

In one possible embodiment, the minimum angle of the preset angle range is the first rotation angle; the method further comprises the steps of: calculating the optical path difference under each reference angle parameter in a pre-stored reference angle parameter set and a preset optical path difference expression to obtain a first reference optical path difference set; determining a reference optical path difference meeting the first preset condition from the first reference optical path difference set according to the first preset condition, and obtaining a second reference optical path difference set, wherein the first preset condition is used for indicating that any reference optical path difference in the second reference optical path difference set is larger than the coherence length; determining a reference angle parameter for calculating each reference optical path difference in the second reference optical path difference set to obtain a first reference angle parameter set; according to a second preset condition, selecting a reference angle parameter meeting the second preset condition from the first reference angle parameter set as the first rotation angle, wherein the second preset condition indicates that the minimum angle in the first reference angle parameter set is the first rotation angle.

In one possible embodiment, the maximum angle of the preset angle range is the second rotation angle; the method further comprises the steps of: determining a reference optical path difference meeting a third preset condition from the first reference optical path difference set according to the third preset condition, and obtaining a third reference optical path difference set, wherein the third preset condition indicates that the difference between any one of the third reference optical path differences and the reference optical path difference under the first rotation angle is larger than the coherence length; determining a reference angle parameter for calculating each reference optical path difference in the third reference optical path difference set to obtain a second reference angle parameter set; according to a fourth preset condition, selecting a reference angle parameter meeting the fourth preset condition from the second reference angle parameter set as the second rotation angle, wherein the fourth preset condition indicates that the maximum value in the second reference angle parameter set is the second rotation angle, and the second rotation angle is smaller than a preset angle threshold.

In a possible embodiment, the second preset distance is determined according to the thickness and refractive index of the retarder.

In a second aspect, embodiments of the present application provide a random number generating device including an interferometer, an image processor, and a controller, wherein: the controller is used for determining that the optical path difference between the first light beam and the second light beam is larger than the preset coherence length, and the light sources of the first light beam and the second light beam are starlight; the image processor is used for acquiring at least one frame of target image generated by the first light beam and the second light beam through the interferometer, and each frame of target image in the at least one frame of target image is related to the phase fluctuation of the light source and the initial phase difference between the first light beam and the second light beam; the controller is further configured to select a first number of target pixel points from each frame of target image of the at least one frame of target image, and generate a random sequence corresponding to each frame of target image according to image information of the target pixel points, where the random sequence includes at least one random number.

In one possible implementation, the image processor includes a photosensitive element, where a photosensitive plane of the photosensitive element is disposed relatively vertically from the interferometer at a first preset distance, so that the first light beam and the second light beam can irradiate on the photosensitive plane after passing through the interferometer; the light sensing element is used for detecting the light intensity generated by the first light beam and the second light beam at each position of the light sensing plane through the interferometer at each moment, the light intensity is related to the phase fluctuation of the light source and the initial phase difference between the first light beam and the second light beam, and the light intensity at each position of the light sensing plane at each moment is converted into a digital image signal to obtain at least one frame of target image.

In a possible embodiment, the random number generating device further includes a light screen, and the image processor includes a collection element, where the light screen is disposed relatively vertically at a first preset distance from the interferometer, so that the first light beam and the second light beam can impinge on the light screen after passing through the interferometer; wherein the acquisition element is used for acquiring at least one frame of target image generated on the light screen by the first light beam and the second light beam through the interferometer.

In one possible embodiment, the random number generating device further includes a driver; the interferometer comprises a double-slit plate, wherein the double-slit plate is arranged in front of a photosensitive element or a light screen, and is vertically arranged relative to the photosensitive plane or the light screen at a third preset distance; the double-slit plate is connected with the driver; the driver is used for receiving a first control signal from the controller and driving the double slit plate to rotate around a central shaft within a preset angle range under the control of the first control signal, so that the optical path difference between a first light beam and a second light beam is larger than the coherence length, and the central shaft is arranged at the central position of the double slit plate; alternatively, the interferometer includes a double slit plate and a retardation plate provided between the double slit plate and the photosensitive element or the light screen so that either one of the first light beam and the second light beam can be irradiated on the photosensitive plane or the light screen after passing through the retardation plate; the delay piece is connected with the driver; the driver is configured to receive a second control signal from the controller, and drive the delay plate to translate within a second preset distance under the control of the second control signal, so that an optical path difference between the first light beam and the second light beam is greater than the coherence length.

In a third aspect, an embodiment of the present application provides a random number generating device, including: the device comprises a determining module, a light source and a light source, wherein the determining module is used for determining that the optical path difference between a first light beam and a second light beam is larger than a preset coherence length, and the light sources of the first light beam and the second light beam are starlight; an acquisition module for acquiring, with an image processor in a random number generating device, at least one frame of target images generated by the first light beam and the second light beam through an interferometer in the random number generating device, each frame of target image in the at least one frame of target images being related to a phase fluctuation of the light source and an initial phase difference between the first light beam and the second light beam; the random number generation module is used for selecting a first number of target pixel points from each frame of target image of the at least one frame of target image, and generating a random sequence corresponding to each frame of target image according to the image information of the target pixel points, wherein the random sequence comprises at least one random number.

In a possible implementation manner, the random number generation module is specifically configured to: determining the luminosity value of each target pixel point; determining a random number corresponding to each target pixel point based on a difference value between the luminosity value of each target pixel point and an interference value, wherein the interference value is used for representing an average value of light intensity in each frame of target image; and forming a random sequence of each frame of target image according to the random number corresponding to the target pixel point in each frame of target image.

In a possible implementation manner, the random number generating module is further configured to obtain a luminosity value of each pixel point in the target image of each frame before determining a random number corresponding to each target pixel point based on a difference value between the luminosity value and the interference value of each target pixel point; and determining the interference value of each frame of target image according to the average value of the luminosity values of all pixel points in each frame of target image.

In one possible implementation, the image processor includes a photosensitive element, where a photosensitive plane of the photosensitive element is disposed relatively vertically from the interferometer at a first preset distance, so that the first light beam and the second light beam can irradiate on the photosensitive plane after passing through the interferometer; the acquisition module is specifically configured to: detecting, by the photosensitive element, an intensity of light generated by the first light beam and the second light beam at each position of the photosensitive plane by the interferometer at each moment, the intensity of light being related to a phase fluctuation of the light source and an initial phase difference between the first light beam and the second light beam; and converting the light intensity of each position on the photosensitive plane at each moment into a digital image signal to obtain at least one frame of target image.

In one possible embodiment, the interferometer comprises a double slit plate; the determining module is specifically configured to: when the rotation angle of the double slit plate is within a preset angle range, determining that the optical path difference between the first light beam and the second light beam is larger than the coherence length; alternatively, the interferometer includes a double slit plate and a retardation plate provided between the double slit plate and the photosensitive element so that either one of the first light beam and the second light beam can be irradiated on the photosensitive plane or the light screen after passing through the retardation plate; the determining module is specifically configured to: and when the distance between the delay piece and the double slit plate is larger than a second preset distance, determining that the optical path difference between the first light beam and the second light beam is larger than the coherence length.

In one possible embodiment, the minimum angle of the preset angle range is the first rotation angle; the determining module is further configured to calculate an optical path difference under each reference angle parameter in the reference angle parameter set according to a pre-stored reference angle parameter set and a preset optical path difference expression, obtain a first reference optical path difference set, determine, according to a first preset condition, a reference optical path difference satisfying the first preset condition from the first reference optical path difference set, obtain a second reference optical path difference set, where the first preset condition is used to indicate that any reference optical path difference in the second reference optical path difference set is greater than the coherence length, determine a reference angle parameter used to calculate each reference optical path difference in the second reference optical path difference set, obtain a first reference angle parameter set, and select, according to a second preset condition, a reference angle parameter satisfying the second preset condition from the first reference angle parameter set as the first rotation angle, where the second preset condition indicates that a minimum angle in the first reference angle parameter set is the first rotation angle.

In one possible embodiment, the maximum angle of the preset angle range is the second rotation angle; the determining module is further configured to determine, according to a third preset condition, a reference optical path difference satisfying the third preset condition from the first reference optical path difference set, obtain a third reference optical path difference set, indicate that a difference between any one of the third reference optical path difference sets and the reference optical path difference under the first rotation angle is greater than the coherence length, and determine a reference angle parameter for calculating each of the third reference optical path differences, and obtain a second reference angle parameter set; according to a fourth preset condition, selecting a reference angle parameter meeting the fourth preset condition from the second reference angle parameter set as the second rotation angle, wherein the fourth preset condition indicates that the maximum value in the second reference angle parameter set is the second rotation angle, and the second rotation angle is smaller than a preset angle threshold.

In a fourth aspect, an embodiment of the present application provides a random number generating device, including: at least one processor, and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the at least one processor implementing the method according to the first aspect and any possible implementation manner by executing the instructions stored by the memory.

In a fifth aspect, embodiments of the present application provide a computer-readable storage medium storing computer instructions that, when run on a computer, cause the computer to perform a method according to the first aspect and any one of the possible implementations.

In a sixth aspect, embodiments of the present application provide a computer program product comprising computer instructions which, when run on a computer, cause the method according to the first aspect and any of the possible embodiments described above to be implemented.

The advantages of the second to sixth aspects may be referred to the description of the first aspect, and are not repeated here.

Drawings

Fig. 1 is a schematic flow chart of a random number generation method based on star optical coherence according to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a random number generating device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a random number generating device according to an embodiment of the present application;

fig. 4 is a schematic structural diagram III of a random number generating device according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a random number generating device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a random number generating device according to an embodiment of the present application;

fig. 7 is a schematic flow chart of a random number generation method based on star optical coherence according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a random number generating device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a random number generating device according to an embodiment of the present application.

Detailed Description

For a better understanding of the technical solutions provided in the present application, the following detailed description will be given with reference to the drawings and specific embodiments.

In order to facilitate understanding of the technical solutions provided by the embodiments of the present application, the background technology related to the embodiments of the present application is first described herein.

Since the random number is widely applied to various application scenes of data transmission, in order to improve the confidentiality of the data transmission, the randomness requirement of the random number is correspondingly improved. However, with the increasing computing power, the security of the pseudo random number generated based on a specific mathematical algorithm cannot be effectively ensured, so obtaining an unpredictable true random number has become a technical problem to be solved currently.

The randomness of true random numbers is derived from unpredictable physical systems, otherwise known as physical entropy sources, and therefore, current true random numbers are generated by extracting randomness from the physical entropy sources. The physical entropy sources used for generating the true random numbers comprise laser phase noise, vacuum fluctuation noise, a chaotic light source, amplified spontaneous emission noise and the like. The related researches and technical schemes at present mainly utilize various special light sources to generate true random numbers, and the various special light sources are specifically, for example, lasers working near a threshold value, erbium-doped fiber amplifiers without input light, light injection chaotic lasers and the like.

The sun is one of the most easily available light sources, and at present, there is also a method for generating random numbers by using the sun, and the main scheme is as follows: detecting the light intensity of sunlight, converting the light intensity into frequency information or polarization information, and generating random numbers based on the converted frequency information or polarization information. In the process of converting light intensity into frequency information or polarization information, a plurality of single photon detectors, polarization state preparation devices (including half-wave plates and quarter-wave plates), filters, a plurality of couplers and the like are needed, and relatively complex preparation procedures are needed to assist in effective generation. Therefore, the random number generation mode has a complex process and low random number generation efficiency; and the required equipment is numerous, and the cost is high.

In view of this, the embodiments of the present application provide a method for generating random numbers based on star light coherence, which mainly uses the coherence of star light, detects the randomness of the star light in phase, and extracts the randomness of the star light in phase to generate random numbers, wherein the star light refers to light emitted by a star, for example, light emitted by the sun. The random number generation method provided by the embodiment of the application is applied to a random number generation device, wherein the random number generation device comprises an interferometer and an image processor, and the method specifically comprises the following steps: and under the condition that the optical path difference between the first light beam and the second light beam is larger than the preset coherence length, the random number generating device collects at least one frame of target image generated by the first light beam and the second light beam through the interferometer by using the image processor, selects a first number of target pixel points from each frame of target image of the at least one frame of target image, and generates a random sequence corresponding to each frame of target image according to the image information of the target pixel points, wherein the random sequence comprises at least one random number. Wherein the light sources of the first light beam and the second light beam are starlight, and each frame of the target image in the at least one frame of the target image is related to the phase fluctuation of the light sources and the initial phase difference between the first light beam and the second light beam.

Since there is no coherence between the first beam and the second beam when the optical path difference between the first beam and the second beam is greater than the preset coherence length, at this time, the phase fluctuation of the starlight and the initial phase difference between the first beam and the second beam are random, and therefore, at least one frame of target image generated by the first beam and the second beam through the interferometer is an irregular image, and thus, random numbers with better randomness are generated by using the image information of the irregular image. In addition, each frame of target image in the embodiment of the application can generate a group of random sequences, so that the target images can be acquired in real time, thereby realizing real-time batch generation of random numbers, in other words, improving the random number generation efficiency.

An application scenario of the random number generation method provided in the embodiment of the present application is illustrated below by taking light emitted by the sun as a starlight.

Referring to fig. 1, an application scenario diagram of a random number generation method based on star light coherence is provided in an embodiment of the present application. As shown in fig. 1, the schematic view of the scene includes a sun 110, a satellite 120, and a base station 130, wherein a random number generating device 121 is disposed in the satellite 120, and wireless communication can be performed between the satellite 120 and the base station 130.

Illustratively, the random number generating device 121 may receive sunlight from the sun 110 and generate a random number using the sunlight, the satellite 120 obtains the random number generated by the random number generating device 121 and transmits the random number to the base station 130 through the key distribution channel, and simultaneously encrypts data to be transmitted using the random number to obtain encrypted data, the satellite 120 transmits the encrypted data to the base station 130 through the free space channel, and the base station 130 decrypts the encrypted data using the received random number after receiving the encrypted data from the satellite 120, thereby obtaining decrypted data. The specific implementation process of the random number generation means 121 for generating a random number will be described in detail below.

It should be noted that, the application scenario shown in fig. 1 is only one of the laser secret communication scenarios that are more typical in the technical solution described in the embodiments of the present application, and the laser secret communication may also include inter-satellite secret communication, or inter-ground station secret communication, where the propagation channel may be a free space channel or a fiber channel. In practical applications, the random number generation method described in the embodiments of the present application is applicable to a scenario where the random number generation device in the present application is configured and can receive starlight.

In order to better understand the random number generation method provided in the embodiment of the present application, the structure of a random number generation device that implements the random number generation method in the embodiment of the present application will be described in detail below.

Referring to fig. 2, a schematic structural diagram of a random number generating device according to an embodiment of the present application is shown. As shown in fig. 2, the random number generating device 200 includes an interferometer 210, an image processor 220, and a controller 230. Wherein the controller 230 may be in wired or wireless communication with the image processor 220. The controller 230 refers to a processor having data processing capability, information processing capability, and control capability, such as a central processing unit (central processing unit, CPU).

Wherein the interferometer 210 is configured to form a first light beam and a second light beam based on the starlight; an image processor 220 for acquiring at least one frame of target image generated by the first and second light beams through the interferometer 210 in case the controller 230 determines that the optical path difference between the first and second light beams is greater than a preset coherence length; the controller 230 is further configured to select a first number of target pixel points from each of at least one frame of target images, and generate a random sequence corresponding to each frame of target images according to image information of the target pixel points, where the random sequence includes at least one random number.

In one possible embodiment, the random number generating device 200 further includes a driver 240, where the driver 240 is connected to the interferometer 210 and the controller 230, respectively, and the driver 240 is controlled by the controller 230 to make the optical path difference between the first light beam and the second light beam larger than a preset coherence length.

In one possible implementation, interferometer 210 may comprise two structures, the first structure being that interferometer 210 comprises a single slit plate and a double slit plate, the single slit plate being disposed in front of the double slit plate with a fourth predetermined distance therebetween being disposed relatively vertically, the single slit plate being for changing starlight to an approximated line source, the double slit plate being for generating the first light beam and the second light beam based on the line source generated by the single slit plate, and for generating the additional phase. The second structure is that the interferometer 210 includes a single slit plate, a double slit plate, and a retardation plate disposed at the rear of the double slit plate, and specifically, the retardation plate may be disposed at the rear of any slit of the double slit plate, and the positional relationship between the single slit plate and the double slit plate is the same as that in the first structure.

In one possible implementation, the image processor 220 may include a photosensitive element or an acquisition element, the photosensitive element being an element capable of converting an optical signal into an electrical signal, such as a photodiode, a photosensor, or the like. Further, in order to increase the random number generation efficiency, the image area detected by the photosensitive element is larger, and the photosensitive element may also be a photosensitive element which has a higher speed and can be detected in an array, and may be, for example, an array photodiode, a charge coupled device (charge coupled device, CCD) camera, a complementary metal oxide semiconductor (complementary metal oxide semiconductor, CMOS), or the like. The acquisition element refers to an element with an image acquisition function, such as various cameras.

The following describes the setting positions of the photosensitive element or the collecting element in the random number generating device when the image processor 220 includes the photosensitive element or the collecting element, respectively.

When the image processor 220 includes a photosensitive element, the photosensitive plane of the photosensitive element and the interferometer 210 are disposed relatively vertically at a first preset distance, and in particular, the photosensitive plane may be disposed relatively vertically at a third preset distance from the double slit plate, so that the first light beam and the second light beam can be irradiated on the plane of the photosensitive element after passing through the interferometer 210, where the first preset distance and the third preset distance may be set based on actual requirements. The photosensitive element may then detect the intensity of the first and second light beams at each time at each location on the photosensitive plane by the interferometer 210, and convert the intensity of the light at each location on the photosensitive plane at each time into a digital image signal, thereby obtaining at least one frame of the target image.

When the image processor 220 includes an acquisition element, the random number generating device 200 further includes a light screen 250, where the light screen 250 is disposed relatively vertically spaced from the interferometer 210 by a first predetermined distance, and in particular, the light screen 250 may be disposed relatively vertically spaced from the double slit plate by a third predetermined distance such that the first light beam and the second light beam are capable of impinging on the light screen 250 after passing through the interferometer 210. In this case, the acquisition element may acquire at least one frame of target image generated on the screener 250 by the first and second beams through the interferometer 210.

That is, the random number generating device provided in the embodiment of the present application may at least include the following structures: the first structure: the device comprises a single slit plate, a double slit plate, a light screen, a collecting element and a controller; the second structure: the device comprises a single slit plate, a double slit plate, a delay plate, a light screen, a collecting element and a controller; and a third structure: a single slit plate, a double slit plate, a photosensitive element and a controller; fourth structure: single slit plate, double slit plate, delay plate, photosensitive element and controller. In order to better understand the structure of the above-described four kinds of random number generating devices, the following will exemplify the random number generating devices of the above-described four kinds of structures, respectively, with reference to schematic structural diagrams of the random number generating devices shown in fig. 3 to 6.

The first structure: single slit plate, double slit plate, light screen, acquisition element and controller.

Fig. 3 is a schematic structural diagram of a random number generating device according to an embodiment of the present application. As shown in fig. 3, the random number generating means 300 comprises an interferometer 310, a collection element 320, a screener 330 and a controller 340. Wherein interferometer 310 comprises a single slit plate 311 and a double slit plate 312.

Illustratively, after passing through the two slits in the single slit plate 311 and the double slit plate 312, the starlight forms a first light beam and a second light beam, and irradiates the light screen 330, and when the controller 340 determines that the optical path difference between the first light beam and the second light beam is greater than a preset coherence length, the collection element 320 collects at least one frame of target image generated on the light screen 330 by the first light beam and the second light beam, and sends the at least one frame of target image to the controller 340, and the controller 340 generates a random sequence of each frame of target image based on the at least one frame of target image.

Wherein the controller 340 determines that the optical path difference between the first light beam and the second light beam is greater than the preset coherence length may be implemented according to a rotation angle of the preset double slit plate 312. For example, before the random number is generated, the double slit plate 312 in the interferometer 310 is rotated by a preset angle and then fixed, that is, the double slit plate 312 is always inclined in the interferometer 310, so that when the random number is generated, the difference between the paths of the first light beam and the second light beam reaching the light screen 330 through the rotated double slit plate 312 (that is, the optical path difference between the first light beam and the second light beam) is always greater than the preset coherence length. The preset angle is an angle which can enable the optical path difference between the first light beam and the second light beam to be always larger than the preset coherence length, and the preset angle can be calculated by a worker.

Alternatively, the controller 340 may control the rotation of the double slit plate 312 to determine that the optical path difference between the first light beam and the second light beam is greater than a preset coherence length. In this case, a central axis is provided at a central position of the double slit plate 312, and the random number generating device 300 may further include a driver 350, and the driver 350 is connected to the double slit plate 312. The driver 350 receives the first control signal from the controller 340, and drives the two-slit plate to rotate around the central axis within a preset angle range under the control of the first control signal, so that the optical path difference between the first light beam and the second light beam is larger than the preset coherence length.

The first control signal is used for indicating the driver to drive the two-slit plate to rotate within a preset angle range at a first speed, or the first control signal is used for indicating the driver to drive the two-slit plate to rotate to a third rotation angle, the third rotation angle can be any angle within the preset angle range, the preset angle range is calculated in advance, and a specific calculation method of the preset angle range is described in detail below.

In order to improve the randomness of the random numbers generated by the controller 340, before the first control signal is sent, the controller 340 may further determine the third rotation angle according to a preset random algorithm, so that the third rotation angle also has a certain randomness, thereby improving the randomness of the generated random numbers. The preset random algorithm is, for example, a linear congruence method, a meisen rotation method, etc.

Wherein, the controller 340 generates the first control signal may be generated based on a preset signal generator. The first control signal may be a voltage signal and the driver may be composed of a motor or a piezoelectric ceramic. Also, to ensure that the random number can be generated in time, the first control signal may be pre-stored in the storage medium after being generated by the controller 340, and the controller 340 reads the first control signal from the storage medium and transmits the first control signal to the driver 350 at intervals of a preset time period to control the rotation of the double slit plate 312.

Among others, storage media include computer system readable media in the form of volatile or nonvolatile memory, such as random access memory (random access memory, RAM), cache memory, hard disk drive, nonvolatile optical disk (including compact disk-read only memory (CD-ROM), high density optical disk-read only memory (DVD-ROM), or other optical media), and the like.

Illustratively, as shown in FIG. 3, the rotated double slit plate 312 is illustrated in FIG. 3 by a broken line, and the paths of the first light beam and the second light beam from the single slit plate 311 to the screener 330 after the double slit plate 312 is rotated are illustrated in FIG. 3 by a broken line.

It should be noted that, in fig. 3, the driver 350 is disposed at the lower end of the double slit plate 312 for illustration, but in practice, the driver 350 may be disposed at the upper end of the double slit plate 312, or at other positions, so long as it is ensured that the driver 350 drives the double slit plate 312 to rotate within a preset angle range under the control of the first control signal. Fig. 3 is illustrated with the collection element 320 positioned in a forward, lower position of the screener, but in practice the collection element 320 may be positioned in other positions, simply by ensuring that the collection element 320 is able to collect at least one frame of the target image produced on the screener 330.

The second structure: single slit plate, double slit plate, delay piece, light screen, collecting element and controller.

Referring to fig. 4, a third schematic structural diagram of a random number generating device according to an embodiment of the present application is provided. As shown in fig. 4, the random number generating means 400 includes an interferometer 410, a collection element 420, a screener 430, and a controller 440. The interferometer 410 includes, among other things, a single slit plate 411, a double slit plate 412, and a retardation plate 413.

Illustratively, the starlight passes through two slits in the single slit plate 411 and the double slit plate 412 to form a first light beam and a second light beam, the first light beam passes through the slits to be irradiated on the light screen 430, and the second light beam passes through the slits to be irradiated on the light screen 430 through the retardation plate 413. When the controller 440 determines that the optical path difference between the first and second light beams is greater than the preset coherence length, the acquisition element 420 acquires at least one frame of target image generated on the screener 430 by the first and second light beams and transmits the at least one frame of target image to the controller 440, and the controller 440 generates a random sequence of each frame of target image based on the at least one frame of target image.

Wherein the controller 440 determines that the optical path difference between the first and second light beams is greater than the preset coherence length may be achieved by a distance between the preset retarder 413 and the double slit plate 412. For example, before the random number is generated, the delay plate 413 is fixed at a position spaced from the double slit plate 412 by more than a second preset distance, and when the random number is generated, the optical path difference between the first light beam and the second light beam may be made to be always greater than a preset coherence length, where the optical path difference between the delay plate and the double slit plate may be made to be always greater than a distance of the preset coherence length, the second preset distance may be related to the refractive index and the thickness of the delay plate, and the second preset distance may be calculated by the operator or by the controller 440, and a specific implementation of the controller 440 to calculate the second preset distance will be described in detail below.

Alternatively, the controller 440 may control the translation of the retarder 413 to determine that the optical path difference between the first and second light beams is greater than the predetermined coherence length. In this case, the random number generating means 400 may further include a driver 450, the driver 450 being connected to the delay piece 413. The driver 450 may receive a second control signal from the controller 440, and drive the delay plate 413 to translate within a range greater than a second preset distance under the control of the second control signal, so that the optical path difference between the first light beam and the second light beam is greater than the preset coherence length. The second control signal is used to instruct the driver 450 to drive the delay plate 413 to translate within a second preset distance at a second speed, or the second control signal is used to instruct the driver 450 to drive the delay plate to translate a fifth preset distance, where the fifth preset distance is less than or equal to the second preset distance.

To improve randomness of the random numbers, the fifth preset distance may be calculated by the controller 440 based on a preset random algorithm, and the content of the preset random algorithm may correspond to that described above.

Wherein, the controller 440 generates the second control signal based on a preset signal generator, the second control signal may be a voltage signal, and the driver 450 may be composed of an electrode or a piezoelectric ceramic. And, in order to ensure that the random number can be generated in time, the second control signal may be pre-stored in the storage medium after being generated by the controller 440, and the controller 440 reads from the storage medium and transmits the second control signal to the driver 450 at intervals of a preset time period to control the translation of the delay plate 413. The content of the storage medium may correspond to the content described above, and will not be described herein.

In fig. 4, the delay piece 413 is shown as being disposed behind the slit at the lower end of the double slit plate 412, but in practice, the delay piece 413 may be disposed behind the slit at the upper end of the double slit plate 412. Accordingly, fig. 4 illustrates that the driver 450 is disposed at the lower end of the double slit plate 412, but in practice, the driver 450 may be disposed at the upper end of the double slit plate 412, or at other positions, so long as it is ensured that the driver 450 drives the delay plate 413 to translate within the second preset distance under the control of the second control signal. Fig. 4 is illustrated with the acquisition element 420 positioned in a lower front position of the light screen 430, but in practice the acquisition element 420 may be positioned in other positions, simply by ensuring that the acquisition element 420 is able to acquire at least one frame of the target image produced on the light screen 430.

And a third structure: single slit plate, double slit plate, photosensitive element and controller.

Referring to fig. 5, a schematic structural diagram of a random number generating device according to an embodiment of the present application is shown. As shown in fig. 5, the random number generating device 500 includes an interferometer 510, a photosensitive element 520, and a controller 530. Wherein interferometer 510 comprises a single slit plate 511 and a double slit plate 512.

Illustratively, the starlight passes through the single slit plate 511 and the double slit plate 512 to form a first light beam and a second light beam, and is irradiated on the photosensitive plane of the photosensitive element 520. When the controller 530 determines that the optical path difference between the first and second light beams is greater than the preset coherence length, the photosensitive element 520 collects at least one frame of target image on the photosensitive plane and transmits the at least one frame of target image to the controller 530, and the controller 530 generates a random sequence of target images per frame based on the at least one frame of target image.

In one possible implementation, the random number generating device 500 further includes a driver 540.

The specific implementation manner of determining that the optical path difference between the first light beam and the second light beam is greater than the preset coherence length by the controller 530 may correspond to the description of fig. 3, and will not be repeated here.

Fourth structure: single slit plate, double slit plate, delay plate, photosensitive element and controller.

Fig. 6 is a schematic structural diagram of a random number generating device according to an embodiment of the present application. As shown in fig. 6, the random number generating device 600 includes an interferometer 610, a photosensitive element 620, and a controller 630. The interferometer 610 includes, among other things, a single slit plate 611, a double slit plate 612, and a retardation plate 613.

Illustratively, the starlight passes through the single slit plate 611 and the double slit plate 612 to form a first light beam and a second light beam, the first light beam passes through the slit of the double slit plate 612 to be irradiated on the photosensitive plane of the photosensitive element 620, and the second light beam passes through the slit to be irradiated on the photosensitive plane of the photosensitive element 620 through the retardation plate 613. When the controller 630 determines that the optical path difference between the first beam and the second beam is greater than the preset coherence length, the photosensitive element 620 collects at least one frame of target image on the photosensitive plane and transmits the at least one frame of target image to the controller 630, and the controller 630 generates a random sequence of target images per frame based on the at least one frame of target image.

In one possible implementation, the random number generating device 600 further includes a driver 640.

The specific implementation manner of determining that the optical path difference between the first light beam and the second light beam is greater than the preset coherence length by the controller 630 may correspond to the description of fig. 4, and will not be repeated here.

It should be noted that, in fig. 6, the retardation plate 613 is illustrated as being located behind the slit at the lower end of the double slit plate 612, but in practice, the retardation plate 613 may be located behind the slit at the upper end of the double slit plate 612, for example, which is not limited in the embodiment of the present application.

The following describes the random number generation method provided in the embodiment of the present application in detail with reference to the schematic structural diagrams of the random number generation device shown in fig. 2 to 6 and the schematic flow chart of one random number generation method shown in fig. 7.

Referring to fig. 7, a flow chart of a random number generation method based on star light coherence is provided in an embodiment of the present application. The steps shown in fig. 7 are described below as being executed by the random number generating device. The embodiment shown in fig. 7 is applicable to the application scenario shown in fig. 1. The random number generator shown in fig. 7 is, for example, any one of the random number generators shown in fig. 1 to 6. The interferometer according to fig. 7 is, for example, the interferometer according to any one of fig. 2 to 6, the image processor according to fig. 7 is, for example, the image processor according to fig. 2, the double slit plate according to fig. 7 is, for example, the double slit plate according to any one of fig. 3 to 6, the photosensitive element according to fig. 7 is, for example, the photosensitive element according to fig. 5 or 6, the collecting element according to fig. 7 is, for example, the collecting element according to fig. 3 or 4, the light screen according to fig. 7 is, for example, the light screen according to fig. 3 or 4, and the retarder according to fig. 7 is, for example, the retarder according to fig. 4 or 6.

S701, the random number generating device determines that the optical path difference between the first light beam and the second light beam is larger than the preset coherence length, and the light sources of the first light beam and the second light beam are starlight.

Wherein the specific meaning of starlight may correspond to what has been described above with reference to the preceding text. The coherence length is a parameter in a pre-stored random number generating device, the coherence length is a known disclosed parameter, and the coherence length may refer to the coherence length of the starlight, for example, if the starlight is sunlight, the preset coherence length corresponds to the coherence length of the sunlight. Illustratively, the coherence length of sunlight is 1.58 x 10 (-7) to 9 x 10 (-7) meters.

The optical path difference between the first light beam and the second light beam means a difference between a first path length of the first light beam through the single slit plate, the double slit plate to reach a target position of a light sensing plane or a light screen of the light sensing element, and a second path length of the second light beam through the single slit plate, the double slit plate to reach the target position of the light sensing plane or the light screen. The target position may refer to any position on the plane of the photosensitive element, for example, the point P shown in fig. 3-6.

Wherein the random number generating means determines that the optical path difference between the first beam and the second beam is greater than the coherence length may be achieved by controlling the double slit plate to rotate or controlling the retarder to translate. The two modes are described below.

In the first way, the random number generator controls the rotation of the double slit plate.

The content of the random number generating device controlling the rotation of the double slit plate can be specifically referred to the content of the embodiment shown in fig. 3.

When the random number generating device determines that the rotation angle of the double slit plate is within the preset angle range, it is determined that the optical path difference between the first light beam and the second light beam is larger than the coherence length. Wherein the preset angle range may be predetermined by the random number generating means. The minimum angle in the preset angle range is a first rotation angle, the maximum angle is a second rotation angle, if the first rotation angle is expressed as theta ₀ The second rotation angle is denoted as θ ₁ The preset angle range may be expressed as (θ ₀ ，θ ₁ ）。

Specifically, the random number generating device can control the rotation angle of the double slit plate to change rapidly within a preset angle range. In this way, if the initial rotation angle of the double slit plate is controlled to be theta ₀ The rotation angle θ of the double slit plate can be expressed asWherein->Control signal expressed as rotation angle of double slit plate, < >>Indicating that the double slit plate is at the initial angle theta ₀ Angle of rapid change above +.>Variation range of>. Or the random number generating device controls the double slit plate to rotate to a fixed angle within a preset angle range and then is unchanged. In either case, the random number generating means determines that the optical path difference between the first light beam and the second light beam is greater than the coherence length.

A specific manner of determining the first rotation angle and the second rotation angle by the random number generating means will be described in detail.

1. A first rotation angle.

The random number generation device calculates the optical path difference under each reference angle parameter in the reference angle parameter set according to a pre-stored reference angle parameter set and a preset optical path difference expression to obtain a first reference optical path difference set. Wherein the pre-stored reference angle parameter set comprisesAn internal angle parameter.

Next, referring to a schematic structure of a random number generating device shown in fig. 5, taking a distance between two slits of a double slit plate as 2d, a distance from a center position of the double slit plate to a center position of a photosensitive plane of a photosensitive element as s, a center position of the photosensitive plane as an origin, a vertical direction as a y axis, a horizontal direction as an x axis, establishing a rectangular coordinate system, and taking a target position of a first light beam and a second light beam reaching the photosensitive plane as a P point, and taking coordinates of the P point as (x, y) as an example, a preset optical path difference expression is exemplified. Wherein, if the length and width of the photosensitive plane are respectively denoted as a and b, x, y satisfies-a/2 < x < a/2, -b/2< y < b/2. When the double slit plate is parallel to the plane of the photosensitive element, the rotation angle of the double slit plate is 0, and a preset optical path difference expression is as follows:

Wherein,representing the optical path difference between the first and second beams, r ₁ Representing the first path length of the first beam to the P point, r ₂ Representing the second path length of the second beam to point P, α is used to represent the angle of incidence of the first beam as it passes through the slit of the double slit plate.

When the random number generating device controls the double slit plate to rotate, correspondingly, the optical path difference between the first light beam and the second light beam is changed due to the rotation of the double slit plate. In this embodiment, taking P point as an example, the rotation angle of the double slit plate is recorded as θ, and the optical path difference expression of a double slit plate is as follows:

wherein,and after the double slit plate rotates, the optical path difference between the first light beam and the second light beam is represented, and theta is the rotation angle of the double slit plate.

Based on the above-described optical path difference expression, the random number generating device may acquire a reference optical path difference for each reference angle parameter in the reference angle parameter set, thereby acquiring a first reference optical path difference set.

The random number generating device determines a reference optical path difference larger than the coherence length from a first reference optical path difference set according to a first preset condition, and the reference optical path difference larger than the coherence length is formed into a second reference optical path difference set, wherein the first preset condition is used for indicating that any reference optical path difference in the second reference optical path difference set is larger than the coherence length.

That is, whenWhen, that is, the optical path difference between the first beam and the second beam is larger than the coherence length, it will be satisfied that +.>The reference optical path difference component of (2) is a second reference optical path difference set, wherein +.>Representing the coherence length.

The random number generating means determines a reference angle parameter for calculating each reference optical path difference in the second set of reference optical path differences, and composes a first set of reference angle parameters. The random number generating means sorts the reference angle parameters in the first set of reference angle parameters in a first order (from large to small or from small to large). And the random number generating device takes the minimum reference angle parameter as a first rotation angle from the ordered first reference angle parameter set according to a second preset condition, wherein the second preset condition indicates that the minimum angle in the first reference angle parameter set is the first rotation angle.

2. And a second rotation angle.

After the random number generating device determines the first reference optical path difference set, determining the reference optical path difference meeting a third preset condition from the first reference optical path difference set according to a third preset condition to obtain a third reference optical path difference set, wherein the third preset condition indicates that the difference between any one of the third reference optical path difference sets and the reference optical path difference under the first rotation angle is larger than the coherence length.

Exemplary, the initial rotation angle of the double slit plate is the first rotation angle theta ₀ The rotation angle of the double slit plate is recorded as theta ₃ The random number generating means will satisfyThe reference optical path difference composition of (2) is a third reference optical path difference set. That is, the double slit plate has a rotation angle of θ ₃ When the optical path difference between the first light beam and the second light beam is larger than the coherence length and the optical path difference between the first light beam and the second light beam is larger than the coherence length, the rotation angle of the double slit plate is determined to be theta ₃ The optical path difference satisfies a third preset condition.

The random number generating device determines reference angle parameters for calculating each reference optical path difference in the third reference optical path difference set to obtain a second reference angle parameter set, the random number generating device sorts the second reference angle parameter sets according to a first sequence, and selects a maximum angle from the sorted second reference angle parameter sets as a second rotation angle according to a fourth preset condition, wherein the fourth preset condition indicates that the maximum value in the second reference angle parameter set is the second rotation angle, and the second rotation angle is smaller than a preset angle threshold, and the preset angle threshold is preset, and the preset angle threshold is specifically, for example 。

In a second way, the random number generating means controls the delay plate translation.

The specific implementation of the random number generating device to control the translation of the delay plate may correspond to what has been described with reference to the corresponding embodiment of fig. 4.

When the random number generating device determines that the distance between the delay piece and the double slit plate is larger than a second preset distance, the optical path difference between the first light beam and the second light beam is determined to be larger than the coherence length. The second preset distance may be preconfigured in the random number generating means, or may be determined by the random number generating means based on a prestored refractive index and thickness parameter of the retardation plate, for example, the second preset distance is the thickness of the retardation plate.

Specifically, the random number generating device may control the delay plate to move rapidly within a distance range greater than the second preset distance, or the random number generating device may control the delay plate to translate to a fixed position greater than the second preset distance and then not change, where in either case, the optical path difference between the first light beam and the second light beam is greater than the coherence length.

The mode of calculating the optical path difference by the random number generator when the delay sheet is provided in the random number generator will be described in detail below.

Since the retarder is located behind one slit of the double slit plate, taking the example that the retarder is located in the slit where the second light beam is located as shown in fig. 4, the path length of the second light beam reaching the plane of the photosensitive element increases due to the influence of the retarder after the second light beam passes through the slit. Thus, in such an embodiment, a preset path difference expression may be as follows:

where n represents the refractive index of the retarder and w represents the thickness of the retarder.

Based on the above optical path difference expression, it is found that when the product of the refractive index and the thickness of the retardation plate is larger than the difference between the coherence length and the optical path difference when the retardation plate is not provided, the following is satisfiedWhen it is determined that the optical path difference between the first and second light beams is greater than the coherence length. That is, in the case where the refractive index of the retardation plate is a fixed parameter, the optical path difference between the first light beam and the second light beam can be adjusted by changing the distance between the retardation plate and the double slit plate. In particular, in the case where the first light beam and the second light beam can reach the photosensitive plane after passing through the retarder, i.e., -b/2 is satisfied<y<In the case of b/2, the thickness of the retarder may be determined as a second preset distance, and thus, the optical path difference between the first light beam and the second light beam may be determined to be greater than the coherence length within a range greater than the second preset distance.

Alternatively, the optical path difference between the first light beam and the second light beam may be adjusted by changing the refractive index of the retardation plate, i.e. changing retardation plates of different materials.

When the random number generating device includes a light screen, the manner of calculating the preset angle range and the second preset distance is the same as the manner of calculating the preset angle range and the second preset distance when the random number generating device includes a photosensitive element.

Step S701 may be specifically performed by the controller shown in any one of fig. 2 to 6.

S702, the random number generating device acquires at least one frame of target image generated by the first light beam and the second light beam through the interferometer, and each frame of target image in the at least one frame of target image is related to the fluctuation of the phase of the light source and the initial phase difference between the first light beam and the second light beam.

The random number generating device collects at least one frame of target image generated by the first light beam and the second light beam through the interferometer, wherein the at least one frame of target image can be collected by an image processor in the random number generating device, and particularly can be collected by a photosensitive element or a collecting element. The manner in which the photosensitive element captures at least one frame of the target image or the capturing element captures at least one frame of the target image is described below.

In a first way, the photosensitive element captures at least one frame of the target image.

When it is determined that the optical path difference between the first light beam and the second light beam is greater than the coherence length, there is no coherence between the first light beam and the second light beam, and therefore, the first light beam and the second light beam reach the photosensitive plane through the interferometer, forming an irregular image on the photosensitive plane. At this time, the photosensitive element detects the light intensity of the first light beam and the second light beam generated at each position (each pixel point) of the photosensitive plane at each timing, and converts the light intensity at each position on the photosensitive element plane at each timing into a digital image signal to be output and processed into at least one frame of target image.

In this case, since the phase fluctuation of the light source and the initial phase difference between the first light beam and the second light beam are random in the case where there is no coherence between the first light beam and the second light beam, the light intensity associated with the phase difference is also associated with the phase fluctuation of the light source and the initial phase difference between the first light beam and the second light beam, and the light intensity is also random. Therefore, at least one frame of target image obtained based on the light intensity conversion also has randomness.

Taking P point (x, y) as an example, the randomness of the light intensities of the first light beam and the second light beam at each position of the plane of the photosensitive element at each timing detected by the photosensitive element is exemplified by the following expression.

The two light fields of the first light beam and the second light beam reaching the P point on the plane of the photosensitive element are respectivelyAnd，/>and->Can be expressed as:

wherein,representing light field amplitude +.>Representing the frequency of the light wave>Representing the delay caused by the optical path difference between the first and second light beams, then the light is sensedThe intensity of P point detected by the elementICan be expressed as:

wherein,the initial phase difference of the first light beam and the second light beam and the phase fluctuation of the light source are represented. When->When (I)>Is a random variable, satisfy->Is a uniform distribution of (c). It can be seen that the light intensity detected by the photosensitive element is also a random variable based on the influence of the initial phase difference of the first light beam and the second light beam and the phase fluctuation of the light source, and has randomness.

In a second way, the acquisition element acquires at least one frame of the target image.

Upon determining that the optical path difference between the first and second light beams is greater than the coherence length, the acquisition element captures at least one frame of a target image of the first and second light beams produced on the screener by the interferometer.

S703, the random number generation device selects a first number of target pixel points from each frame of target image of at least one frame of target image, and generates a random sequence corresponding to each frame of target image according to the image information of the target pixel points, wherein the random sequence comprises at least one random number.

The first quantity is preconfigured in the random number generating device and can be set according to actual requirements. For example, when the number of required random numbers increases or decreases, the first number may be increased or decreased as appropriate. The image information is information reflecting the intensity of light at the pixel, and can be understood as information reflecting the brightness of the pixel.

In order to improve randomness of the random number, the random number generating means may select the first number of target pixel points from each frame of target image as randomly selected, and specifically may be determined by a preset random algorithm, for example, a linear congruence method, a meisen rotation method, or the like.

After the random number generating device selects the first number of target pixel points from each frame of target image, acquiring a luminosity value of each target pixel point, wherein the luminosity value is used for indicating the intensity of light of the pixel point, and the luminosity value can be specifically represented by a gray value or by other image parameters for indicating the intensity of light of the pixel point.

Since at least one frame of the target image is an irregular image, the luminosity value of each pixel point in each frame of the target image is random, and therefore the luminosity value of each target pixel point can be determined as a random number by the random number generation device. Further, the random number generation device sets random numbers corresponding to all target pixel points in each frame of target image as a random sequence of each frame of target image.

In one possible implementation, since the digital image signal output by the photosensitive element has a dc component, in order to make the image signal of each pixel more obvious, the luminosity value after removing the influence of the disturbance value on the luminosity value of each pixel may be determined as a random number, where the disturbance value is used to indicate the dc component in the image signal.

Illustratively, taking the luminosity value as an example of the gray value, the random number generation device may determine a difference between the gray value and the interference value of each target pixel point as a random number corresponding to each target pixel point.

In this embodiment, the interference value may be represented by an average value of light intensities in each frame of the target image, and since the light intensity is calculated in a complicated manner, the interference value may be calculated from the luminosity value representing the light intensity of the pixel. The manner in which the random number generating device determines the interference value will be described below.

After the random number generating device acquires each frame of target image, acquiring the luminosity value of each pixel point in each frame of target image, calculating the average value of luminosity values of all pixel points in each frame of target image, and determining the average value to be the interference value of each frame of target image.

For example, the random number generating means may determine the average value of the gray values of all the pixel points in each frame of the target image as the interference value of each frame of the target image.

It will be appreciated that when the random number generating means comprises a light screen and a collecting element, the random number generating means may calculate the random number in the same way as when the random number generating means comprises a light sensitive element. Wherein, when the random number generating means includes a light screen and an acquisition element, the interference value can also be determined by calculating an average value of luminosity values of all pixel points of the target image of each frame when calculating the random number.

Step S703 may be specifically performed by the controller shown in any one of fig. 2 to 6.

It should be noted that, in step S703, a random sequence of determining a frame of target image is described, and in the case that there are multiple frames of target images, the manner of determining the random sequence for each frame of target image in the multiple frames of target images is the same as that described in step S703, and will not be repeated here.

According to the method and the device, the coherence of starlight is utilized, when the optical path difference between the first light beam and the second light beam is determined to be larger than the preset coherence length, the coherence does not exist between the first light beam and the second light beam, at the moment, the phase fluctuation of the starlight and the initial phase difference between the first light beam and the second light beam are random, and therefore at least one frame of target image generated by the first light beam and the second light beam through the interferometer is an irregular image, and therefore random numbers with good randomness are generated by utilizing the image information of the irregular image. In addition, since the random number is extracted from the image information, and each frame of image comprises a plurality of pixel points, the image information of each pixel point can generate a random number, and therefore each frame of target image can generate a group of random sequences. In other words, according to the random number generation method provided by the embodiment of the application, the target image can be acquired in real time to generate the random sequence in real time, and the random number generation efficiency is high.

Based on the same inventive concept, the embodiment of the present application provides a random number generating device, which is configured to implement any one of the above random number generating methods based on star optical coherence, for example, the random number generating method shown in fig. 7, and may further implement the function of the foregoing random number generating device.

Referring to fig. 8, a schematic structural diagram of a random number generating device according to an embodiment of the present application is shown in fig. 8, and the random number generating device 800 includes a determining module 801, an obtaining module 802, and a random number generating module 803.

The determining module 801 is configured to determine that an optical path difference between the first light beam and the second light beam is greater than a preset coherence length, where light sources of the first light beam and the second light beam are starlight; an acquisition module 802 for acquiring, with an image processor in the random number generating device, at least one frame of target image generated by the first light beam and the second light beam through an interferometer in the random number generating device, each frame of target image in the at least one frame of target image being related to a phase fluctuation of the light source and an initial phase difference between the first light beam and the second light beam; the random number generation module 803 is configured to select a first number of target pixel points from each frame of target image of at least one frame of target image, and generate a random sequence corresponding to each frame of target image according to image information of the target pixel points, where the random sequence includes at least one random number.

In one possible implementation, the random number generation module 803 is specifically configured to: determining the luminosity value of each target pixel point; determining a random number corresponding to each target pixel point based on a difference between a luminosity value of each target pixel point and an interference value, wherein the interference value is used for representing an average value of light intensity in each frame of target image; and forming a random sequence of each frame of target image according to the random number corresponding to the target pixel point in each frame of target image.

In a possible implementation manner, the random number generation module 803 is further configured to obtain a luminosity value of each pixel point in each frame of the target image before determining the random number corresponding to each target pixel point based on a difference between the luminosity value and the interference value of each target pixel point; and determining the interference value of each frame of target image according to the average value of the luminosity values of all the pixel points in each frame of target image.

In one possible embodiment, the image processor includes a photosensitive element, the photosensitive plane of the photosensitive element being disposed relatively vertically from the interferometer at a first predetermined distance such that the first light beam and the second light beam are capable of impinging on the photosensitive plane after passing through the interferometer; the obtaining module 802 is specifically configured to: detecting, by a photosensitive element in the random number generating device, light intensities generated by the first light beam and the second light beam at each position of the photosensitive plane by the interferometer at each moment, the light intensities being related to phase fluctuation of the light source and an initial phase difference between the first light beam and the second light beam; and converting the light intensity of each position on the photosensitive plane at each moment into a digital image signal to obtain at least one frame of target image.

In one possible embodiment, the interferometer comprises a double slit plate; the determining module 801 is specifically configured to: when the rotation angle of the double slit plate is within a preset angle range, determining that the optical path difference between the first light beam and the second light beam is larger than the coherence length; alternatively, the interferometer comprises a double slit plate and a delay plate, wherein the delay plate is arranged between the double slit plate and the photosensitive element, so that any one of the first light beam and the second light beam can irradiate on a photosensitive plane or a light screen after passing through the delay plate; the determining module 801 is specifically configured to: when the distance between the delay plate and the double slit plate is larger than the second preset distance, the optical path difference between the first light beam and the second light beam is determined to be larger than the coherence length.

In one possible embodiment, the minimum angle of the preset angle range is the first rotation angle; the determining module 801 is further configured to calculate, according to a pre-stored reference angle parameter set and a preset optical path difference expression, an optical path difference under each reference angle parameter in the reference angle parameter set, obtain a first reference optical path difference set, determine, according to a first preset condition, a reference optical path difference satisfying the first preset condition from the first reference optical path difference set, obtain a second reference optical path difference set, where the first preset condition is used to indicate that any reference optical path difference in the second reference optical path difference set is greater than a coherence length, determine a reference angle parameter used to calculate each reference optical path difference in the second reference optical path difference set, obtain a first reference angle parameter set, and select, according to a second preset condition, from the first reference angle parameter set, a reference angle parameter satisfying the second preset condition as a first rotation angle, where the second preset condition indicates that a minimum angle in the first reference angle parameter set is the first rotation angle.

In one possible embodiment, the maximum angle of the preset angle range is the second rotation angle; the determining module 801 is further configured to determine, according to a third preset condition, a reference optical path difference that satisfies the third preset condition from the first reference optical path difference set, obtain a third reference optical path difference set, where the third preset condition indicates that a difference between any one of the third reference optical path differences and the reference optical path difference under the first rotation angle is greater than a coherence length, and determine a reference angle parameter for calculating each of the third reference optical path differences, so as to obtain a second reference angle parameter set; according to a fourth preset condition, selecting a reference angle parameter meeting the fourth preset condition from the second reference angle parameter set as a second rotation angle, wherein the fourth preset condition indicates that the maximum value in the second reference angle parameter set is the second rotation angle, and the second rotation angle is smaller than a preset angle threshold.

Based on the same inventive concept, the embodiment of the present application provides a random number generating device, which is configured to implement any one of the above random number generating methods based on star optical coherence, for example, the random number generating method shown in fig. 7, and may also implement the function of the foregoing random number generating device.

Fig. 9 is a schematic structural diagram of a random number generating device according to an embodiment of the present application. As shown in fig. 9, the random number generating device 900 includes at least one processor 901, and a memory 902 communicatively coupled to the at least one processor 901.

Among them, the processor 901 may be a general-purpose processor or a special-purpose processor, or the like. The processor 901 includes, for example: baseband processor or central processing unit, etc. The baseband processor may be used to process communication protocols as well as communication data. The central processor may be used to control the random number generating device 900, execute software programs, and/or process data. The different processors may be separate devices or may be provided in one or more processing circuits, e.g. integrated on one or more application specific integrated circuits.

In one embodiment, the memory 902 stores instructions executable by the at least one processor 901, and the at least one processor 901 performs functions as the foregoing random number generation device by executing the instructions stored by the memory 902, and accordingly, performs steps performed by the foregoing random number generation device.

Under such an embodiment, the random number generating device 900 may also implement the functionality of the preamble random number generating means 800, and the at least one processor 901 in the random number generating device 900 may also implement the functionality of the preamble determination module 801, the acquisition module 802, and the random number generating module 803.

Based on the same inventive concept, embodiments of the present application provide a computer readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform any of the above-described random number generation methods based on star light coherence, for example, the random number generation method shown in fig. 7.

Based on the same inventive concept, an embodiment of the present application provides a computer program product, which contains computer instructions that, when executed on a computer, cause the above random number generation method based on star light coherence as described above to be implemented, for example, as the random number generation method shown in fig. 7.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. The random number generation method based on the star light coherence is characterized by being applied to a random number generation device, wherein the random number generation device comprises an interferometer and an image processor, and the interferometer comprises a double-slit plate; the method comprises the following steps:

determining that the optical path difference between a first light beam and a second light beam is larger than a preset coherence length, wherein the light sources of the first light beam and the second light beam are starlight, and the first light beam and the second light beam are generated after the starlight passes through the double slit plate;

Acquiring, with the image processor, at least one frame of target images generated by the first and second beams through the interferometer, each frame of target image in the at least one frame of target images being related to a phase fluctuation of the light source and an initial phase difference between the first and second beams;

selecting a first number of target pixel points from each frame of target image of the at least one frame of target image, and generating a random sequence corresponding to each frame of target image according to the image information of the target pixel points, wherein the random sequence comprises at least one random number.

2. The method of claim 1, wherein selecting a first number of target pixels from each frame of target image of the at least one frame of target images and generating a random sequence corresponding to each frame of target image based on image information of the target pixels, comprises:

determining the luminosity value of each target pixel point;

determining a random number corresponding to each target pixel point based on a difference value between the luminosity value of each target pixel point and an interference value, wherein the interference value is used for representing an average value of light intensity in each frame of target image;

And forming a random sequence of each frame of target image according to the random number corresponding to the target pixel point in each frame of target image.

3. The method of claim 2, wherein prior to determining the random number corresponding to each target pixel based on the difference between the luminosity value and the disturbance value for each target pixel, the method further comprises:

acquiring the luminosity value of each pixel point in each frame of target image;

and determining the interference value of each frame of target image according to the average value of the luminosity values of all pixel points in each frame of target image.

4. A method according to any one of claims 1 to 3, wherein the image processor comprises a photosensitive element, the photosensitive plane of which is disposed relatively vertically from the interferometer at a first predetermined distance such that the first and second light beams are able to impinge on the photosensitive plane after passing through the interferometer; acquiring, with the image processor, at least one frame of target image generated by the first and second beams through the interferometer, comprising:

detecting, by the photosensitive element, an intensity of light generated by the first light beam and the second light beam at each position of the photosensitive plane by the interferometer at each moment, the intensity of light being related to a phase fluctuation of the light source and an initial phase difference between the first light beam and the second light beam;

And converting the light intensity of each position on the photosensitive plane at each moment into a digital image signal to obtain at least one frame of target image.

5. The method of claim 4, wherein determining that the optical path difference between the first beam and the second beam is greater than a predetermined coherence length comprises:

when the rotation angle of the double slit plate is within a preset angle range, determining that the optical path difference between the first light beam and the second light beam is larger than the coherence length; or,

the interferometer comprises a double-slit plate and a delay plate, wherein the delay plate is arranged between the double-slit plate and the photosensitive element, so that any one of the first light beam and the second light beam can irradiate on the photosensitive plane after passing through the delay plate; determining that the optical path difference between the first light beam and the second light beam is greater than a preset coherence length comprises:

and when the distance between the delay piece and the double slit plate is larger than a second preset distance, determining that the optical path difference between the first light beam and the second light beam is larger than the coherence length.

6. The method of claim 5, wherein the minimum angle of the predetermined angular range is a first rotation angle; the method further comprises the steps of:

Calculating the optical path difference under each reference angle parameter in a pre-stored reference angle parameter set and a preset optical path difference expression to obtain a first reference optical path difference set;

determining a reference optical path difference meeting the first preset condition from the first reference optical path difference set according to the first preset condition, and obtaining a second reference optical path difference set, wherein the first preset condition is used for indicating that any reference optical path difference in the second reference optical path difference set is larger than the coherence length;

determining a reference angle parameter for calculating each reference optical path difference in the second reference optical path difference set to obtain a first reference angle parameter set;

according to a second preset condition, selecting a reference angle parameter meeting the second preset condition from the first reference angle parameter set as the first rotation angle, wherein the second preset condition indicates that the minimum angle in the first reference angle parameter set is the first rotation angle.

7. The method of claim 6, wherein the maximum angle of the predetermined angular range is a second rotation angle; the method further comprises the steps of:

Determining a reference optical path difference meeting a third preset condition from the first reference optical path difference set according to the third preset condition, and obtaining a third reference optical path difference set, wherein the third preset condition indicates that the difference between any one of the third reference optical path differences and the reference optical path difference under the first rotation angle is larger than the coherence length;

determining a reference angle parameter for calculating each reference optical path difference in the third reference optical path difference set to obtain a second reference angle parameter set;

according to a fourth preset condition, selecting a reference angle parameter meeting the fourth preset condition from the second reference angle parameter set as the second rotation angle, wherein the fourth preset condition indicates that the maximum value in the second reference angle parameter set is the second rotation angle, and the second rotation angle is smaller than a preset angle threshold.

8. The method of claim 5, wherein the second predetermined distance is determined based on a thickness and a refractive index of the retarder.

9. A random number generating device comprising an interferometer, an image processor, and a controller, the interferometer comprising a double slit plate, wherein:

The controller is used for determining that the optical path difference between a first light beam and a second light beam is larger than a preset coherence length, the light sources of the first light beam and the second light beam are starlight, and the first light beam and the second light beam are generated after the starlight passes through the double slit plate;

the image processor is used for acquiring at least one frame of target image generated by the first light beam and the second light beam through the interferometer, and each frame of target image in the at least one frame of target image is related to the phase fluctuation of the light source and the initial phase difference between the first light beam and the second light beam;

the controller is further configured to select a first number of target pixel points from each frame of target image of the at least one frame of target image, and generate a random sequence corresponding to each frame of target image according to image information of the target pixel points, where the random sequence includes at least one random number.

10. The apparatus of claim 9, wherein the image processor comprises a photosensitive element, a photosensitive plane of the photosensitive element being disposed relatively vertically from the interferometer a first predetermined distance such that the first light beam and the second light beam are capable of impinging on the photosensitive plane after passing through the interferometer;

The light sensing element is used for detecting the light intensity generated by the first light beam and the second light beam at each position of the light sensing plane through the interferometer at each moment, the light intensity is related to the phase fluctuation of the light source and the initial phase difference between the first light beam and the second light beam, and the light intensity at each position of the light sensing plane at each moment is converted into a digital image signal to obtain at least one frame of target image.

11. The apparatus of claim 9, wherein the random number generating means further comprises a light screen, the image processor comprising a collection element, the light screen being disposed relatively vertically spaced a first predetermined distance from the interferometer such that the first and second light beams are capable of impinging on the light screen after passing through the interferometer;

wherein the acquisition element is used for acquiring at least one frame of target image generated on the light screen by the first light beam and the second light beam through the interferometer.

12. The apparatus according to claim 10 or 11, wherein the random number generating means further comprises a driver;

The double-slit plate is arranged in front of the photosensitive element or the light screen, and is vertically arranged relative to the photosensitive plane or the light screen at a third preset distance; the double-slit plate is connected with the driver;

the driver is used for receiving a first control signal from the controller and driving the double slit plate to rotate around a central shaft within a preset angle range under the control of the first control signal, so that the optical path difference between a first light beam and a second light beam is larger than the coherence length, and the central shaft is arranged at the central position of the double slit plate; or,

the interferometer further comprises a retarder disposed between the double slit plate and a photosensitive element or a light screen such that either one of the first light beam and the second light beam can be irradiated on the photosensitive plane or the light screen after passing through the retarder; the delay piece is connected with the driver;

the driver is configured to receive a second control signal from the controller, and drive the delay plate to translate within a second preset distance under the control of the second control signal, so that an optical path difference between the first light beam and the second light beam is greater than the coherence length.

13. A random number generating device, characterized in that the random number generating device comprises an interferometer, the interferometer comprising a double slit plate; the device comprises:

the determining module is used for determining that the optical path difference between a first light beam and a second light beam is larger than a preset coherence length, the light sources of the first light beam and the second light beam are starlight, and the first light beam and the second light beam are generated after the starlight passes through the double slit plate;

an acquisition module for acquiring at least one frame of target images generated by the first light beam and the second light beam through an interferometer in the random number generating device, each frame of target image in the at least one frame of target images being related to a phase fluctuation of the light source and an initial phase difference between the first light beam and the second light beam;

the random number generation module is used for selecting a first number of target pixel points from each frame of target image of the at least one frame of target image, and generating a random sequence corresponding to each frame of target image according to the image information of the target pixel points, wherein the random sequence comprises at least one random number.

14. A random number generating apparatus, characterized by comprising:

At least one processor, and

a memory communicatively coupled to the at least one processor;

wherein the memory stores instructions executable by the at least one processor, the at least one processor implementing the method of any one of claims 1-8 by executing the memory stored instructions.

15. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1-8.