Information transmission multiple encryption and decryption method and system based on random light field

Abstract

The invention provides an information transmission multiple encryption and decryption method and system based on a random light field, and relates to the technical field of optical encryption, and the method comprises the steps: encrypting plaintext information and multiple secret keys into a coherent structure of the random light field, and synthesizing the random light field carrying ciphertext information and secret key information through employing a complex amplitude coding algorithm; performing far-field transmission on the synthesized random light field; measuring a coherent structure of a transmitted random light field by using a phase perturbation method, and decrypting information encrypted in the random light field in a far field through inverse transformation in combination with a decryption key; the existing optical encryption technology is expanded by utilizing optical coherence engineering, the development of an optical encryption system for high-security information storage and transmission is promoted, and the application of the optical coherence engineering in high-security optical communication and quantum information is stimulated.

Description

Technical Field

[0001] The present disclosure relates to the field of optical encryption technology, and in particular to a method and system for multiple encryption and decryption of information transmission based on random light fields. Background Art

[0002] With the increasing popularity of smart wearable devices, individuals now have the ability to access or share information from the Internet at any time and anywhere; a large part of which, whether it involves personal affairs, corporate interests, or even national security, requires strict confidentiality and is limited to the sender and recipient. Cryptography is the basis for protecting confidential information; however, in the rapidly developing network environment, the one-dimensional and serial processing characteristics of traditional digital cryptography cannot meet the higher security requirements of fast network data transmission. Optical encryption can solve these challenges. By combining optical coded modulation technology with traditional encryption methods, optical encryption has great potential in applications involving multi-degree-of-freedom data transmission and shows great prospects in the field of information security.

[0003] The birth of optical security systems can be traced back to the pioneering work of P. Refrergier and B. Javidi on double random phase encoding. With the introduction of light fields with special structures in amplitude, phase, polarization or coherence, the inherent degrees of freedom in "structured light fields" have become the preferred approach for optical encryption. For example, recently proposed optical encryption technologies using phase structure modulation, orbital angular momentum and polarization mode division multiplexing design; however, there are two problems: on the one hand, the transmission of light beams in free space, especially through turbulent media, poses a potential threat to the integrity of encryption technology; current encryption technologies usually only focus on the discussion of the light source surface, while ignoring the key aspect of information recovery after free space transmission; therefore, optical encryption technologies optimized for free space transmission are not ideally able to resist attacks from inside and outside the transmission channel; on the other hand, researchers are working to increase the number of keys by manipulating various degrees of freedom in the light field to improve the security of optical encryption systems; however, due to the limitations of the degrees of freedom of the light field, the number of keys is often limited; therefore, existing technologies cannot flexibly customize the number of keys and cannot provide high-security optical encryption systems with unlimited key sets. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a multiple encryption and decryption method and system for information transmission based on random light fields, expands the existing optical encryption technology by using optical coherence engineering, promotes the development of optical encryption systems for high-security information storage and transmission, and inspires the application of optical coherence engineering in high-security optical communications and quantum information.

[0005] According to some embodiments, the present disclosure adopts the following technical solutions:

[0006] The multiple encryption and decryption method of information transmission based on random light field includes:

[0007] Encrypt plaintext information and multiple keys into the coherent structure of random light field, and use complex amplitude coding algorithm to synthesize random light field carrying ciphertext information and key information;

[0008] Far-field transmission of synthesized random light fields;

[0009] The phase perturbation method is used to measure the coherent structure of the transmitted random light field. Combined with the decryption key, the information encrypted in the random light field is decrypted in the far field through inverse transformation.

[0010] According to some embodiments, the present disclosure adopts the following technical solutions:

[0011] The information transmission multiple encryption and decryption system based on random light field includes encryption end and decryption end:

[0012] The encryption end is used to encrypt the plaintext information and multiple keys into the coherent structure of the random light field, synthesize the random light field carrying the ciphertext information and key information by using the complex amplitude coding algorithm, and perform far-field transmission on the synthesized random light field;

[0013] The decryption end is used to measure the coherent structure of the transmitted random light field using the phase perturbation method, and decrypt the information encrypted in the random light field in the far field through inverse transformation in combination with the decryption key.

[0014] According to some embodiments, the present disclosure adopts the following technical solutions:

[0015] A computer program product comprises a computer program, wherein when the computer program is executed by a processor, the multiple encryption and decryption method for information transmission based on random light fields is implemented.

[0016] According to some embodiments, the present disclosure adopts the following technical solutions:

[0017] A non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the multiple encryption and decryption method for information transmission based on random light fields is implemented.

[0018] According to some embodiments, the present disclosure adopts the following technical solutions:

[0019] An electronic device comprises: a processor, a memory and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory, so that the electronic device executes the multiple encryption and decryption method for information transmission based on random light fields.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a method and system for multiple encryption and decryption of information transmission based on the statistical characteristics of statistically stationary random light fields, which effectively solves the challenges in the field of contemporary optical encryption and provides several key advantages, including:

[0022] The immunity of dynamic ciphertext speckle to free-space diffraction effects ensures the transmission of encrypted information and has strong resistance to external attacks.

[0023] Unlimited keys were introduced to accommodate customized key quantity needs and significantly improve the security of encryption systems.

[0024] It is worth emphasizing that random light fields allow the extended degree of freedom of statistical properties to be combined with polarization and orbital angular momentum, thereby establishing a wider space of information carriers and achieving high-capacity optical encryption with a high level of security.

[0025] The present invention utilizes optical coherence engineering to expand the existing optical encryption technology, promotes the development of optical encryption systems for high-security information storage and transmission, and inspires the application of optical coherence engineering in high-security optical communications and quantum information. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0027] Figure 1 The present invention is a method flow chart of an embodiment of the present invention.

[0028] Figure 2 The present invention is a flow chart of measuring coherent structure using the phase perturbation method according to an embodiment of the present invention.

[0029] Figure 3 2 is a structural diagram of an experimental device according to an embodiment of the present disclosure.

[0030] Among them, 1. Helium-neon laser, 2. polarizer, 3. beam expander, 4. first beam splitter, 5. first spatial light modulator, 6. first lens, 7. pinhole aperture, 8. second lens, 9. hot plate, 10. third lens, 11. second beam splitter, 12. second spatial light modulator, 13. fourth lens, 14. charge coupled device. DETAILED DESCRIPTION

[0031] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] Example 1

[0035] In one embodiment of the present disclosure, a method for multiple encryption and decryption of information transmission based on a random light field is provided, comprising:

[0036] Encrypt plaintext information and multiple keys into the coherent structure of random light field, and use complex amplitude coding algorithm to synthesize random light field carrying ciphertext information and key information;

[0037] Far-field transmission of synthesized random light fields;

[0038] The phase perturbation method is used to measure the coherent structure of the transmitted random light field. Combined with the decryption key, the information encrypted in the random light field is decrypted in the far field through inverse transformation.

[0039] As an embodiment, the disclosed multiple encryption and decryption method for information transmission based on random light fields constructs an encryption method carrying multiple encryption keys, encrypts the information into the statistical characteristics of the random light field (i.e., the coherent structure), and then performs far-field transmission, and recovers the information by determining the spatial coherent structure of the random light field carrying the ciphertext and key information; the encryption method proposed in this embodiment can theoretically set an infinite number of keys, so that it can resist the brute force cracking attack of the computer; and the random light field carrying the encrypted information can effectively resist external noise attacks during the transmission process, so that its spatial coherent structure at the receiving end is not destroyed, thereby recovering the information in combination with the decryption key.

[0040] Taking the encrypted information as a positive function as an example, the specific implementation method of this encryption scheme is explained. Figure 1 As shown, the specific process is:

[0041] Step 1: Encrypt the plaintext information and multiple keys into the coherent structure of the random light field, and use the complex amplitude coding algorithm to synthesize the random light field carrying the ciphertext information and key information.

[0042] Specifically, step 1.1: based on the theory that the coherent structure of a random light field is determined by the intensity distribution of incoherent light and the response function of a transmission optical system, the intensity distribution of incoherent light is used to represent plaintext information, and the response function of the transmission optical system is used as an encryption key in the encryption process to achieve information encryption.

[0043] The specific implementation is to use the constantly refreshed white complex noise to dynamically hide the encrypted plaintext information and embed the key at the same time, generating a colored complex noise set containing the encrypted information and the key information.

[0044] In the Cartesian coordinate system, it is assumed that the encrypted information is represented as I(v), where v is a two-dimensional variable. After being modulated by the white complex noise R(v) (random complex matrix) that satisfies the standard normal distribution, Fourier transform is performed, and then the encryption key K is embedded to encrypt the information into the colored complex noise, resulting in the colored complex noise set r is the spatial position and F represents the Fourier transform.

[0045] Different from the traditional double random phase encryption, the information is encrypted into a set of colored complex noise {ψ m (r)} M , the subscripts m and M represent the sequence number and total number of the colored complex noise in the colored complex noise set respectively. And the embedded encryption key can be expressed as a key set {K n} N , where n and N represent the sequence number and total number of keys in the key set; in principle, the keys in the key set can be infinite, thus allowing an infinite number of keys to be used in the proposed scheme; the security of the encryption method can be exponentially enhanced by increasing the number of keys.

[0046] Step 1.2: Using the complex amplitude coding algorithm, the cross-spectral density function of the random light field carrying the ciphertext information and the key information is represented as an incoherent superposition of multiple complex random patterns; the weights of all the complex random patterns are normalized, and a random light field containing the ciphertext and the key information is generated by superimposing a preset number of complex random patterns.

[0047] When the elements of the above colored complex noise set are randomly and cyclically applied to a deterministic light field E(r), a random light field U(r)=E(r)ψ(r) with random fluctuations in space and time is obtained; the addition of colored complex noise introduces a new degree of freedom in the light field, namely coherence, which is determined by the statistical properties of the light field; according to statistical optics and optical coherence theory, the coherence of the light field and its four-dimensional spatial coherence structure can be determined by the ensemble average μ(r1,r2)∝ of the random light field. <U(r1)U *(r2)>, where U(r) represents the random light field, r represents the spatial position coordinate, * represents the complex conjugate, and <> represents the ensemble average; therefore, the encrypted information and key are encoded into the coherent structure of the random light field; using the coherent structure as the carrier of encrypted information makes the scheme resistant to noise attacks.

[0048] The above encryption process is based on the encryption theory of the light source surface:

[0049] Step 2: Perform far-field transmission of the synthesized random light field.

[0050] This set of random light fields carrying encrypted information and keys is transmitted through the lens.

[0051] Step 3: Use the phase perturbation method to measure the coherent structure of the transmitted random light field, combine it with the decryption key, and decrypt the information encrypted in the random light field in the far field through inverse transformation.

[0052] The random light field set of the decryption end (focal plane / far field) is analyzed. It should be noted that the solution of this embodiment is applicable to any transmission distance. The light field set of the colored complex noise of the decryption end (focal plane / far field) can be derived by using the Collins integral formula, and their ensemble average can be expressed as Where U(ρ) represents the random light field in the far field plane, ρ represents the spatial position coordinates of the far field plane, * represents the complex conjugate, F represents the Fourier transform, I(v) represents the encrypted information, {K n (r)} N It is a key set with N keys. By using the relationship between the coherent structure and the ensemble average of the random light field, the coherent structure of the received random light is measured and combined with the key through the following formula to recover the encrypted information, which is expressed as:

[0053]

[0054] Among them, F -1 represents the inverse Fourier transform, μ(ρ1,ρ2) represents the coherent structure of the far-field plane, {K n (r)} N is a key set with N keys, and * represents complex conjugation.

[0055] The theoretical basis and implementation details of the above steps are explained below:

[0056] According to the generalized Van Sett-Zernike theorem, a statistically stationary random light field can be generated by the transmission of a spatially incoherent light source; in this process, the coherent structure of the random light field is related to the incoherent light after transmission, and is determined by the intensity distribution of the incoherent light and the response function of the transmission optical system. In the actual encryption process, the intensity distribution of the incoherent light can be set to represent the encrypted information, and the response function of the transmission optical system can be used as the encryption key in the encryption process; this allows both the information and the key to be encrypted into the coherent structure of the random light field; therefore, by measuring the coherent structure of the random light field, the original information can be reconstructed by using the decryption key and then performing an inverse transformation.

[0057] Based on modern coherence theory, all second-order statistics in the spatial frequency domain are contained in the coherence function between two points in the light field; the cross-spectral density function W(r1,r2) = <U(r1)U * (r2)>, where U(r) is the random light field at spatial position r, the angle brackets represent the ensemble average of all fields, and the asterisk represents the complex conjugate. According to the necessary and sufficient conditions, the cross spectral density function of the random light field can be expressed as the following integral form:

[0058] W(r1,r2)=∫I(v)H(r1,v)H * (r2,v)d 2 v

[0059] Among them, I(v) is a non-negative function of any two-dimensional variable v, and is also the encrypted information function in this example. H(r,v) can be any kernel function, and * represents complex conjugation; in order to implement the proposed information encryption, it is set to carry the key set:

[0060] H(r,v)=τ(r)exp(i2πr·v){K n (r)} N

[0061] Where τ(r) is the real amplitude distribution of the response function, {K n (r)} N is a key set with N keys.

[0062] Based on the above settings, the expression of the random source with encrypted information and key can be obtained as:

[0063]

[0064] in, is the Fourier transform of the encrypted information function I(v), if is a spatially uniform function, that is is a constant, then the spatial coherence structure of the random light field can be expressed as:

[0065]

[0066] Therefore, after measuring the coherent structure of the random light source, the encrypted information I(v) can be obtained through the inverse Fourier transform of μ(r1,r2):

[0067]

[0068] The above is based on the coherent structure of the light source plane and the key to decrypt the information. The theoretical basis for decrypting the random light field carrying encrypted information after transmission (far-field plane) is as follows:

[0069] The generalized Collins formula can be used to study the transmission characteristics of random beams. The cross-spectral density function of a random beam after paraxial transmission through a cylindrical ABCD optical system can be expressed as:

[0070] W(ρ1,ρ2)=∫W(r1,r2)G(r1,ρ1)G * (r2,ρ2)d 2 r1d 2 r2

[0071] Where G(r,ρ) represents the Green's function and ρ is the coordinate of the far field. The random light source is focused by the lens after propagation. The distance between the lens and the output plane is set to z. Then the transfer matrix of the system is Assuming that the light source is a plane wave, the cross spectral density function of the random beam on the focal plane is:

[0072]

[0073] Where λ and f represent the wavelength and lens focal length respectively; then the coherent structure is expressed as:

[0074]

[0075] Therefore, as long as the coherent structure of the random light field after transmission is measured and combined with the key set, the encrypted information can be recovered.

[0076] This embodiment uses the phase perturbation method to measure the coherent structure when the random light field containing the ciphertext information is transmitted to the far-field plane. The specific operation process is as follows: Figure 2 As shown in the figure, by recording the intensity of the random light field on the Fourier plane after three different phase disturbances, the cross spectral density function of the random light field on the target plane can be constructed. The first phase disturbance value C0 is zero, then the Fourier transform average intensity of zero phase disturbance on the target plane is defined as follows:

[0077] S0(ρ)=∫W(r1,r2)T(r1)T * (r2)exp[-i2πρ·(r1-r2)]d2 r1d 2 r2

[0078] Among them, T(r) is the transmittance function of the target plane, and the value of T(r) is 1 inside the aperture and 0 outside the aperture. Subsequently, a phase perturbation is introduced into the aperture as a reference point; the average intensity of the Fourier transform after the perturbation is:

[0079]

[0080] Wherein, C=exp(iΦ)-1 represents complex phase disturbance, and δ(r) represents Dirac function.

[0081] Then, the inverse Fourier transform of S(ρ)-S0(ρ) is performed, and the result is:

[0082] F -1 []S(ρ)-S0(ρ)]=C * W(r+r0,r0)T(r+r0)+C[W(r0-r,r0)T(r0-r)] *

[0083] In order to extract W(r+r0,r0) and W(r0-r,r0), in addition to setting the zero-phase disturbance value C0=0, it is also necessary to set two disturbance values ​​C1 and C2 and establish a linear equation system to recover the cross-spectral density function:

[0084]

[0085] Finally, according to the above system of equations, the cross spectral density function can be recovered from the following formula:

[0086]

[0087] By simply shifting the coordinate -r0, we get W(r,r0), and normalizing it, we get its coherent structure:

[0088]

[0089] This embodiment is implemented by Figure 3The experimental device shown verifies the feasibility of the method. Specifically, a laser beam with a wavelength of 632.8 nm is first emitted from a helium-neon laser 1. After passing through a polarizer 2, the polarization direction of the laser beam is modulated to a horizontal direction to match the response direction of the spatial light modulator. Then, the laser beam passes through a beam expander 3 and a first beam splitter 4 to reach a first spatial light modulator 5. A computational hologram containing ciphertext information and key information generated by a complex amplitude coding algorithm is loaded on the first spatial light modulator 5. After modulation, the light beam carrying the encrypted information is reflected by the beam splitter and reaches a 4f optical system composed of a first lens 6 and a second lens 8. A pinhole aperture 7 placed on the rear focal plane of the first lens 6 filters out a first-order diffraction spot. The rear focal plane of the second lens 8 is the light source surface of the random light field carrying the encrypted information.

[0090] In order to illustrate that the random light field generated by this method can resist external attacks in the transmission channel, a hot plate 9 is placed on the light beam transmission channel to simulate atmospheric turbulence transmission. The random light field carrying encrypted information is focused by the third lens 10 after turbulent transmission and then enters the decryption system.

[0091] The rear focal plane of the third lens 10 is equivalent to the far-field plane of the random light field. In order to measure the coherent structure of this target plane, it is necessary to add a disturbance point to this plane, which is achieved by the second spatial light modulator 12. The light beam focused by the third lens 10 is reflected by the second beam splitter 11 to the second spatial light modulator 12. The second spatial light modulator 12 is loaded with a three-phase perturbation screen. The random light field after disturbance is transmitted through the second beam splitter 11 and focused by the fourth lens 13 to the charge coupled device 14. The charge coupled device 14 records a series of light intensity speckles. The distances from the second spatial light modulator 12 and the charge coupled device 14 to the fourth lens 13 are equal to the focal length of the lens, so it is equivalent to a Fourier transform of the light field on the second spatial light modulator 12. Therefore, the light intensity captured by the charge coupled device 14 is equivalent to the Fourier plane light intensity.

[0092] The coherent structure of the target plane is obtained through the phase perturbation method. Once the decryption key is known, the encrypted information loaded into the random light field can be decrypted in the far field through inverse transformation.

[0093] Example 2

[0094] In one embodiment of the present disclosure, a multiple encryption and decryption system for information transmission based on a random light field is provided, including an encryption end and a decryption end:

[0095] The encryption end is used to encrypt the plaintext information and multiple keys into the coherent structure of the random light field, synthesize the random light field carrying the ciphertext information and key information by using the complex amplitude coding algorithm, and perform far-field transmission on the synthesized random light field;

[0096] The decryption end is used to measure the coherent structure of the transmitted random light field using the phase perturbation method, and decrypt the information encrypted in the random light field in the far field through inverse transformation in combination with the decryption key.

[0097] Example 3

[0098] In one embodiment of the present disclosure, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the multiple encryption and decryption method for information transmission based on random light fields is implemented.

[0099] Example 4

[0100] In one embodiment of the present disclosure, a non-transitory computer-readable storage medium is provided, wherein the non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the multiple encryption and decryption method for information transmission based on random light fields is implemented.

[0101] Example 5

[0102] In one embodiment of the present disclosure, an electronic device is provided, including: a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory, so that the electronic device executes the multiple encryption and decryption method for information transmission based on random light fields.

[0103] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0104] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0105] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A multiple encryption and decryption method for information transmission based on random light fields, characterized in that: include: Encrypt plaintext information and multiple keys into the coherent structure of random light field, and use complex amplitude coding algorithm to synthesize random light field carrying ciphertext information and key information; Far-field transmission of synthesized random light fields; The phase perturbation method is used to measure the coherent structure of the transmitted random light field. Combined with the decryption key, the information encrypted in the random light field is decrypted in the far field through inverse transformation.

2. The information transmission multiple encryption and decryption method based on random light field as claimed in claim 1, characterized in that: The method of encrypting the plaintext information and multiple keys into the coherent structure of the random light field is to use the continuously refreshed white complex noise to dynamically hide the encrypted plaintext information and embed the key at the same time, thereby generating a colored complex noise set containing the encrypted information and the key information.

3. The information transmission multiple encryption and decryption method based on random light field as claimed in claim 2, characterized in that: The method of using continuously refreshed white complex noise to dynamically hide encrypted plaintext information and embed keys at the same time is specifically based on the theory that the coherent structure of the random light field is jointly determined by the intensity distribution of incoherent light and the response function of the transmission optical system. The intensity distribution of incoherent light is used to represent the plaintext information, and the response function of the transmission optical system is used as the encryption key in the encryption process to achieve information encryption.

4. The information transmission multiple encryption and decryption method based on random light field as claimed in claim 2, characterized in that: The complex amplitude coding algorithm is used to synthesize a random light field carrying ciphertext information and key information, specifically: The cross spectral density function of the random light field carrying ciphertext information and key information is represented as an incoherent superposition of multiple complex random patterns; the weights of all complex random patterns are normalized, and a random light field containing ciphertext and key information is generated by superimposing a preset number of complex random patterns.

5. The information transmission multiple encryption and decryption method based on random light field as claimed in claim 4, characterized in that: The synthesis of the random light field carrying the ciphertext information and the key information is specifically implemented as follows: The elements of the color complex noise set are randomly and cyclically applied to a deterministic light field to obtain a random light field that fluctuates randomly in space and time.

6. The information transmission multiple encryption and decryption method based on random light field as claimed in claim 1, characterized in that: The phase perturbation method is specifically: The intensity of the random light field on the Fourier plane after three different phase disturbances is recorded to construct the cross-spectral density function of the random light field on the target plane; the difference between the two Fourier plane intensities with different disturbance values ​​and the Fourier plane intensity of the third phase disturbance is respectively made, and then the difference is multiplied by the coefficient related to the disturbance value, and then an inverse Fourier transform is performed to obtain the cross-spectral density function related to the disturbance point; the coherent structure is obtained after normalizing the cross-spectral density function.

7. Information transmission multiple encryption and decryption system based on random light field, characterized in that: Including encryption and decryption: The encryption end is used to encrypt the plaintext information and multiple keys into the coherent structure of the random light field, synthesize the random light field carrying the ciphertext information and the key information by using the complex amplitude coding algorithm, and perform far-field transmission on the synthesized random light field; The decryption end is used to measure the coherent structure of the transmitted random light field using the phase perturbation method, and decrypt the information encrypted in the random light field in the far field through inverse transformation in combination with the decryption key.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the multiple encryption and decryption method for information transmission based on random light fields as described in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by the processor, the multiple encryption and decryption method for information transmission based on random light fields as described in any one of claims 1 to 6 is implemented.

10. An electronic device, characterized in that: include: A processor, a memory and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory so that the electronic device executes the multiple encryption and decryption method for information transmission based on random light fields as described in any one of claims 1-6.

Images