Optical dual-channel parallel information encryption device and method based on DMD (Digital Micromirror Device)

Abstract

The invention discloses an optical dual-channel parallel information encryption device and method based on a DMD. The device comprises a light beam preprocessing module, a Fourier leaf surface image generation module, a beam splitter, a first ciphertext image generation module and a second ciphertext image generation module. The method comprises the following steps: acquiring a laser beam for preprocessing; carrying out wavefront modulation, Fourier transform and amplitude modulation processing on the preprocessed laser beam to obtain a Fourier leaf surface image, and copying the Fourier leaf surface image to obtain a first Fourier leaf surface image and a second Fourier leaf surface image; and performing filtering and inverse Fourier transform processing on the first Fourier leaf surface image and the second Fourier leaf surface image to generate a 0-level ciphertext image and a first-level ciphertext image. According to the method, the information encryption efficiency can be improved through parallel information encryption of the two encryption channels. The DMD-based optical dual-channel parallel information encryption device and method can be widely applied to the technical field of information encryption security.

Description

Technical Field

[0001] The present invention relates to the field of information encryption security technology, and in particular to an optical dual-channel parallel information encryption device and method based on DMD. Background Art

[0002] Optical information processing technology has the characteristics of parallelism, high speed and low power consumption. Therefore, in the era of big data, the application of optical information processing means to massive privacy data has the technical advantages of high speed and low power consumption. In optical encryption systems, by utilizing the parallel processing properties of light waves, the parallel encryption of multiple information is a means of information encryption with broad application prospects. Various optical encryption schemes of related technologies have proposed double random phase encoding technology to achieve optical image encryption. Later, people developed a variety of optical encryption schemes on this basis. Among them, optical encryption technology based on digital holography has made rapid progress with the development of imaging equipment, because it can provide high-speed processing and secure transmission of two-dimensional images by hiding information of different dimensions. In addition to digital holography, single-pixel imaging technology is also a promising optical encryption method, which combines information compression with target sensing and other technologies. These works have made optical information encryption technology more reliable and secure. However, the above optical encryption technologies also have certain limitations. Because most of the existing optical encryption technologies rely on complex algorithms to reconstruct the target, and the calculation complexity is high, the consumption of computing resources is large, and it is difficult to achieve parallel encryption of multiple information at the same time. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an optical dual-channel parallel information encryption device and method based on DMD, which can improve the encryption efficiency of information through parallel information encryption of two encryption channels.

[0004] The first technical solution adopted by the present invention is: an optical dual-channel parallel information encryption device based on DMD, comprising a beam preprocessing module, a Fourier surface image generation module, a beam splitter, a first ciphertext image generation module and a second ciphertext image generation module, wherein the beam preprocessing module, the Fourier surface image generation module and the beam splitter are sequentially arranged along the transmission direction of the optical path, and the optical path output end of the beam splitter is respectively connected to the optical path input end of the first ciphertext image generation module and the optical path input end of the second ciphertext image generation module, wherein: The beam preprocessing module is used to preprocess the laser beam; The Fourier surface image generation module is used to perform wavefront modulation, Fourier transform and amplitude modulation processing on the laser beam; The beam splitter is used to replicate the Fourier surface image; The first ciphertext image generation module is used to perform filtering and inverse Fourier transform processing on the Fourier surface image; The second ciphertext image generation module is used to perform filtering and inverse Fourier transform processing on the Fourier surface image.

[0005] Furthermore, the light beam preprocessing module includes a lens group and a first aperture, and the lens group and the first aperture are sequentially arranged along the transmission direction of the light path, wherein: The lens group is used to expand and collimate the laser beam emitted by the laser; The first aperture is used to limit the size of the laser beam.

[0006] Further, the Fourier surface image generation module includes a first DMD, a first Fourier lens and a second DMD, wherein the first DMD, the first Fourier lens and the second DMD are sequentially arranged along the transmission direction of the optical path, and the second DMD is placed at the focal plane position of the first Fourier lens, wherein: The first DMD is used to perform wavefront modulation processing on the laser beam, and select the 0th order diffraction image and the 1st order diffraction image as the original optical image; The first Fourier lens is used to perform Fourier transform processing on the original optical image to obtain a preliminary Fourier surface image; The second DMD is used to perform amplitude modulation on the preliminary Fourier surface image to obtain a Fourier surface image.

[0007] Furthermore, the first ciphertext image generation module includes a second aperture, a second Fourier lens and a first CCD camera, wherein the second aperture, the second Fourier lens and the first CCD camera are sequentially arranged along the transmission direction of the light path, and the first CCD camera is placed on the focal plane of the second Fourier lens, wherein: The second aperture is used to filter the Fourier surface image to generate a 0th order Fourier surface image; The second Fourier lens is used to perform inverse Fourier transform processing on the 0th-level Fourier surface image to generate a 0th-level ciphertext image; The first CCD camera is used to collect the generated level 0 ciphertext image.

[0008] Furthermore, the second ciphertext image generation module includes a third aperture, a third Fourier lens and a second CCD camera, wherein the third aperture, the third Fourier lens and the second CCD camera are sequentially arranged along the transmission direction of the light path, and the second CCD camera is placed on the focal plane of the third Fourier lens, wherein: The third aperture is used to filter the Fourier surface image to generate a first-order Fourier surface image; The third Fourier lens is used to perform inverse Fourier transform processing on the first-level Fourier surface image to generate a first-level ciphertext image; The second CCD camera is used to collect the generated first-level ciphertext image.

[0009] The second technical solution adopted by the present invention is: an optical dual-channel parallel information encryption method based on DMD, comprising the following steps: Acquire a laser beam for preprocessing to obtain a preprocessed laser beam; Performing wavefront modulation, Fourier transform and amplitude modulation processing on the pre-processed laser beam to obtain a Fourier surface image; Performing a copy process on the Fourier surface image to obtain a first Fourier surface image and a second Fourier surface image; Filtering and inverse Fourier transforming the first Fourier surface image to generate a 0th-level ciphertext image; The second Fourier surface image is filtered and inverse Fourier transformed to generate a first-level ciphertext image.

[0010] Furthermore, the step of obtaining the laser beam for preprocessing to obtain the preprocessed laser beam specifically includes: Expanding and collimating the laser beam emitted by the laser to obtain a preliminary pre-processed laser beam; The laser beam after preliminary preprocessing is subjected to beam size adjustment processing to obtain a preprocessed laser beam.

[0011] Furthermore, the step of performing wavefront modulation, Fourier transform and amplitude modulation processing on the pre-processed laser beam to obtain the Fourier surface image specifically includes: Performing wavefront modulation processing on the pre-processed laser beam, and selecting the 0th order diffraction image and the 1st order diffraction image as original optical images; Perform Fourier transform processing on the original optical image to obtain a preliminary Fourier surface image; The preliminary Fourier surface image is amplitude modulated to obtain a Fourier surface image.

[0012] Furthermore, the step of filtering and inverse Fourier transforming the first Fourier surface image to generate a level 0 ciphertext image specifically includes: Performing filtering processing on the first Fourier surface image to generate a 0th-order Fourier surface image; Perform inverse Fourier transform processing on the 0th level Fourier surface image to generate a 0th level ciphertext image; Collect and generate the level 0 ciphertext image.

[0013] Furthermore, the step of filtering and inverse Fourier transforming the second Fourier surface image to generate the first-level ciphertext image specifically includes: Performing filtering processing on the second Fourier surface image to generate a first-order Fourier surface image; Performing inverse Fourier transform processing on the first-level Fourier surface image to generate a first-level ciphertext image; Collect the generated level 1 ciphertext image.

[0014] The beneficial effects of the device and method of the present invention are as follows: the present invention introduces a first ciphertext image generation module and a second ciphertext image generation module to filter and inverse Fourier transform the Fourier surface image respectively, and based on the optical diffraction characteristics after laser irradiation of the DMD plane, the Fourier domain of the optical image of the two diffraction orders generated by the DMD control is used as the information encryption channel, and the parallel information encryption of the two encryption channels is realized by light field control, thereby improving the encryption efficiency of the information. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural block diagram of an optical dual-channel parallel information encryption device based on DMD of the present invention; Figure 2 It is a flow chart of a DMD-based optical dual-channel parallel information encryption method of the present invention; Figure 3 is a schematic diagram of an optical dual-channel parallel information encryption method provided by a specific embodiment of the present invention; Figure 4 is a schematic diagram of a result generated by a first ciphertext image generation module provided in a specific embodiment of the present invention; Figure 5 It is a schematic diagram of the result generated by the second ciphertext image generation module provided in a specific embodiment of the present invention.

[0016] Description of the drawings: 1. lens group; 2. first aperture; 3. first DMD; 4. first Fourier lens; 5. second DMD; 6. beam splitter; 7. second aperture; 8. second Fourier lens; 9. first CCD camera; 10. third aperture; 11. third Fourier lens; 12. second CCD camera. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only provided for the convenience of explanation and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0018] First of all, it should be noted that combining the diffraction properties of light waves with optical information processing technology is expected to achieve parallel processing of multiple information. Because each light wave diffraction level can be used as a channel for optical information encryption, the same optical information processing method is performed on each channel, thereby achieving parallel encryption of multiple optical channels at high speed and low power consumption. Therefore, combining optical diffraction with optical information processing technology will be a promising optical multi-channel parallel encryption strategy.

[0019] Based on this, refer to Figure 1 The present invention provides an optical dual-channel parallel information encryption device based on DMD, the device comprises a beam preprocessing module, a Fourier surface image generation module, a beam splitter, a first ciphertext image generation module and a second ciphertext image generation module, the beam preprocessing module, the Fourier surface image generation module and the beam splitter are sequentially arranged along the transmission direction of the optical path, the optical path output end of the beam splitter is respectively connected to the optical path input end of the first ciphertext image generation module and the optical path input end of the second ciphertext image generation module, wherein: The second DMD is placed at the focal plane of the first Fourier lens, the beam splitter is placed between the second DMD and the second aperture, the second aperture is placed between the beam splitter and the second Fourier lens, the first CCD camera is placed on the focal plane of the second Fourier lens, the third aperture is placed between the beam splitter and the third Fourier lens, and the second CCD camera is placed on the focal plane of the third Fourier lens.

[0020] The beam preprocessing module is used to preprocess the laser beam; Specifically, the beam preprocessing module includes a lens group 1 and a first aperture 2, and the lens group and the first aperture are arranged in sequence along the transmission direction of the light path, wherein the lens group is used to expand and collimate the laser beam emitted by the laser; and the first aperture is used to limit the size of the laser beam.

[0021] In this embodiment, the first lens group is used to expand and collimate the laser beam emitted by the laser, preferably to magnify the laser beam emitted by the laser by 20 times, and the first aperture is used to limit the size of the laser beam.

[0022] The Fourier surface image generation module is used to perform wavefront modulation, Fourier transform and amplitude modulation processing on the laser beam; Specifically, the Fourier surface image generation module includes a first DMD3, a first Fourier lens 4 and a second DMD5, wherein the first DMD, the first Fourier lens and the second DMD are arranged in sequence along the transmission direction of the optical path, and the second DMD is placed on the focal plane of the first Fourier lens, wherein the first DMD is used to perform wavefront modulation processing on the laser beam, and select the 0th order diffraction image and the 1st order diffraction image as the original optical image; the first Fourier lens is used to perform Fourier transform processing on the original optical image to obtain a preliminary Fourier surface image; and the second DMD is used to perform amplitude modulation on the preliminary Fourier surface image to obtain a Fourier surface image.

[0023] In this embodiment, the first DMD can change the state of each micromirror according to the written image, and is used to perform wavefront modulation on the laser light beam to generate optical images of multiple diffraction orders, and select the 0th order and the 1st order diffraction images as the original two encrypted channels. The first Fourier lens is used to perform Fourier transform processing on the two original encrypted channels. The second DMD performs amplitude modulation on the Fourier surface images of the two encrypted channels according to the two input encrypted information, so that the two plaintext information on the second DMD are simultaneously loaded onto the Fourier surface images of the two encrypted channels.

[0024] Furthermore, the first DMD has a display resolution of 1080p and a maximum frame rate of 9523 Hz for displaying binary images, and is used to perform wavefront modulation on the laser light beam to generate optical images of multiple diffraction orders; among the optical images of multiple diffraction orders, only the 0th order diffraction image and the 1st order diffraction image are irradiated onto different modulation areas of the second DMD through the first Fourier lens; the first Fourier lens is used to perform Fourier transform processing on the 0th order diffraction image and the 1st order diffraction image to generate a dual-channel Fourier surface image; the second DMD has a display resolution of 1080p and a maximum frame rate of 9523 Hz for displaying binary images, and is used to independently perform amplitude modulation on the dual-channel Fourier images, thereby encrypting plaintext information in the Fourier plane of each optical encryption channel to generate a modulated dual-channel Fourier surface image.

[0025] The beam splitter 6 is used to replicate the Fourier surface image; Specifically, the beam splitter is used to replicate the Fourier surface images of the two encrypted channels, so that the two Fourier surface images are divided into two separate images after passing through the beam splitter.

[0026] The first ciphertext image generation module is used to perform filtering and inverse Fourier transform processing on the Fourier surface image; Specifically, the first ciphertext image generation module includes a second aperture 7, a second Fourier lens 8 and a first CCD camera 9, wherein the second aperture, the second Fourier lens and the first CCD camera are arranged in sequence along the transmission direction of the optical path, and the first CCD camera is placed on the focal plane of the second Fourier lens, wherein the second aperture is used to filter the Fourier surface image to generate a 0th-level Fourier surface image; the second Fourier lens is used to perform Fourier inverse transform processing on the 0th-level Fourier surface image to generate a 0th-level ciphertext image; and the first CCD camera is used to collect the generated 0th-level ciphertext image.

[0027] In this embodiment, the second aperture is used to filter the two Fourier surface images to generate a modulated 0th-order Fourier surface image, the second Fourier lens is used to perform inverse Fourier transform processing on the modulated 0th-order Fourier surface image to generate a 0th-order ciphertext image, and the first CCD camera is used to collect the 0th-order ciphertext image passing through the second Fourier lens.

[0028] The second ciphertext image generation module is used to perform filtering and inverse Fourier transform processing on the Fourier surface image.

[0029] Specifically, the second ciphertext image generation module includes a third aperture 10, a third Fourier lens 11 and a second CCD camera 12, wherein the third aperture, the third Fourier lens and the second CCD camera are arranged in sequence along the transmission direction of the optical path, and the second CCD camera is placed on the focal plane of the third Fourier lens, wherein the third aperture is used to filter the Fourier surface image to generate a first-level Fourier surface image; the third Fourier lens is used to perform Fourier inverse transform processing on the first-level Fourier surface image to generate a first-level ciphertext image; and the second CCD camera is used to collect the generated first-level ciphertext image.

[0030] In this embodiment, the third aperture is used to filter the two Fourier surface images to generate a modulated first-order Fourier surface image, the third Fourier lens is used to perform inverse Fourier transform processing on the modulated first-order Fourier surface image to generate a first-order ciphertext image, and the second CCD camera is used to collect the first-order ciphertext image passing through the third Fourier lens.

[0031] Reference Figure 2 , an optical dual-channel parallel information encryption method based on DMD, comprising the following steps: S100, obtaining a laser beam for preprocessing to obtain a preprocessed laser beam; Specifically, the laser beam emitted by the laser is expanded and collimated to obtain a preliminary preprocessed laser beam; and the preliminary preprocessed laser beam is subjected to beam size adjustment to obtain a preprocessed laser beam.

[0032] S200, performing wavefront modulation, Fourier transform and amplitude modulation processing on the pre-processed laser beam to obtain a Fourier surface image; Specifically, the preprocessed laser beam is subjected to wavefront modulation, and the 0th order diffraction image and the 1st order diffraction image are selected as original optical images; the original optical image is subjected to Fourier transform processing to obtain a preliminary Fourier surface image; the preliminary Fourier surface image is subjected to amplitude modulation to obtain a Fourier surface image.

[0033] In this embodiment, the laser emitted by the laser is collimated and expanded, and then amplitude modulated and diffracted by the first DMD to generate original images of different diffraction orders. The 0th order and 1st order diffraction images are selected as two optical information encryption channels. The first DMD arbitrarily modulates the amplitude of the incident light, and due to the periodically arranged micromirror structure in the first DMD, it generates original optical images of multiple diffraction orders. The 0th order and 1st order diffraction images are selected as two optical information encryption channels. The second DMD performs corresponding amplitude modulation on the 0th order and 1st order Fourier surface images according to the input encryption information, so that different plaintext information on the second DMD is loaded into the two optical information encryption channels at the same time.

[0034] S300, performing a copy process on the Fourier surface image to obtain a first Fourier surface image and a second Fourier surface image; S400, filtering and inverse Fourier transforming the first Fourier surface image to generate a 0th-level ciphertext image; Specifically, the first Fourier surface image is filtered to generate a 0th-level Fourier surface image; the 0th-level Fourier surface image is inversely Fourier transformed to generate a 0th-level ciphertext image; and the generated 0th-level ciphertext image is collected.

[0035] S500 , filtering and inverse Fourier transforming the second Fourier surface image to generate a first-level ciphertext image.

[0036] Specifically, the second Fourier surface image is filtered to generate a first-level Fourier surface image; the first-level Fourier surface image is inversely Fourier transformed to generate a first-level ciphertext image; and the generated first-level ciphertext image is collected.

[0037] In this embodiment, after the two optical information encryption channels pass through the Fourier lens, the optical image of each encryption channel is transformed into a Fourier surface and irradiated onto the second DMD, and the two plaintext information on the second DMD are simultaneously encrypted into the two encryption channels to generate two modulated Fourier surface images. After the two modulated Fourier surface images pass through the Fourier lens and the aperture, two ciphertext images are generated, and CCD technology is used to record the ciphertext image results generated by each encryption channel.

[0038] After the two diffraction order Fourier surface images are subjected to inverse Fourier transformation and the splitting effect of the aperture and the beam splitter, the two ciphertext images are generated and recorded by two CCD cameras respectively. When the DMD is used for amplitude modulation, the plaintext information is hidden in the Fourier information plane of the two ciphertext images. The plaintext information cannot be obtained only from the surface of each ciphertext image. The two ciphertext images are Fourier transformed using numerical calculation software to obtain the encrypted information in each encryption channel.

[0039] The dual-channel decryption and encryption data processing flow of the present invention is further described: Specific as Figure 3 As shown, first, a dual-channel original optical image is generated: the original image is loaded onto the first DMD, and the first DMD changes the state of each micromirror according to the image written by the computer, so that the DMD modulates the amplitude of the incident light, and generates original optical images of multiple diffraction orders, and the 0th order and the 1st order optical diffraction images are selected as two optical information encryption channels, namely channel 1 and channel 2; Further, the original images of the channel 1 and the channel 2 are subjected to Fourier transform processing, and the original images of each optical encryption channel are transformed into Fourier surface images and irradiated at different modulation areas of the second DMD; Then, dual-channel parallel encryption is implemented: two different areas of the second DMD respectively perform amplitude modulation on the Fourier plane images of the channel 1 and the channel 2 according to the two plaintext information input. Part of the spectrum components with encryption information in the Fourier plane images of the two optical encryption channels will be reflected out of the subsequent optical path, so that the two plaintext information on the second DMD are loaded onto the Fourier planes of the channel 1 and the channel 2 respectively; Generation of dual-channel ciphertext images: After the Fourier plane images of channel 1 and channel 2 carrying different encrypted information are processed by inverse Fourier transform, each optical information encryption channel generates a corresponding ciphertext image, i.e., the ciphertext image of channel 1 and the ciphertext image of channel 2. For each imaging optical path, the ciphertext images of the two encryption channels are recorded using CCD technology; Acquisition of decrypted information: After Fourier transform processing is performed on the ciphertext image of channel 1 and the ciphertext image of channel 2 using numerical calculation software, the information hidden in each encrypted channel can be obtained.

[0040] Finally, if Figure 4 and Figure 5 As shown, the present invention uses an experimental device to achieve dual-channel information encryption and decryption in the Fourier domain of optical images, wherein the 0th-order diffraction image is used as the optical encryption channel 1, i.e., the first ciphertext image generation module, and the 1st-order diffraction image is used as the optical encryption channel 2, i.e., the second ciphertext image generation module. Figure 4 (a) is the original image of channel 1. The DMD is used to perform amplitude modulation on the Fourier domain of the original image of channel 1, and the plaintext information is loaded into the Fourier domain of the original image of channel 1. The ciphertext image of channel 1 is recorded by CCD. Figure 4 As shown in (b), it can be seen that the ciphertext image has a high similarity with the original image. The encrypted information cannot be directly obtained from the ciphertext image of channel 1, thus achieving the hiding of the plaintext information. When decrypting, it is necessary to perform spectrum analysis on the ciphertext image of channel 1 through numerical calculation software to correctly obtain the encrypted plaintext information in the channel 1. The decryption result is shown in Figure 4 As shown in (c); similarly, channel 2 performs similar optical information encryption operations as channel 1. Figure 5 (a) is the original image of channel 2. The DMD is used to perform amplitude modulation on the Fourier domain of the original image of channel 2. The ciphertext image of channel 2 obtained by the experiment is as follows: Figure 5 As shown in (b), the ciphertext image of channel 2 cannot directly obtain the encrypted information. The decryption result of the ciphertext image of channel 2 is as follows: Figure 5 As shown in (c), this means that the encrypted information can be obtained by correctly operating the ciphertext image of channel 2.

[0041] In summary, compared with the prior art, the embodiments of the present invention have the following beneficial effects: 1) The DMD-based optical dual-channel parallel information encryption method disclosed in the embodiment of the present invention can generate optical images of different diffraction orders due to the periodic arrangement structure of the micromirror units on the DMD, among which the 0th order diffraction image and the 1st order diffraction image are selected as two independent information encryption channels, thereby improving the efficiency of optical information encryption.

[0042] 2) The DMD-based optical dual-channel parallel information encryption method disclosed in the embodiment of the present invention performs the same optical information processing operation on each information encryption channel during encryption. During decryption, the decoder is only required to perform Fourier transform processing on all the obtained ciphertext images to successfully obtain the plaintext information. There is no need to perform different decryption operations on different encryption channels, thereby improving the decryption efficiency of the information.

[0043] 3) In the DMD-based optical dual-channel parallel information encryption system disclosed in the embodiment of the present invention, the DMD in the encryption system can modulate two information encryption channels simultaneously with one state change, and the two encryption channels can be received synchronously at the receiving end. Therefore, this method of adding encryption channels can break through the upper limit of the DMD modulation speed, thereby achieving the information encryption speed of the entire system equal to twice the DMD modulation speed.

[0044] The contents of the above method embodiments are all applicable to the present system embodiments. The functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0045] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An optical dual-channel parallel information encryption device based on DMD, characterized in that: It includes a beam preprocessing module, a Fourier surface image generating module, a beam splitter, a first ciphertext image generating module and a second ciphertext image generating module, wherein the beam preprocessing module, the Fourier surface image generating module and the beam splitter are sequentially arranged along the transmission direction of the light path, and the light path output end of the beam splitter is respectively connected to the light path input end of the first ciphertext image generating module and the light path input end of the second ciphertext image generating module, wherein: The beam preprocessing module is used to preprocess the laser beam; The Fourier surface image generation module is used to perform wavefront modulation, Fourier transform and amplitude modulation processing on the laser beam; The beam splitter is used to replicate the Fourier surface image; The first ciphertext image generation module is used to perform filtering and inverse Fourier transform processing on the Fourier surface image; The second ciphertext image generation module is used to perform filtering and inverse Fourier transform processing on the Fourier surface image.

2. According to claim 1, an optical dual-channel parallel information encryption device based on DMD, characterized in that: The beam preprocessing module includes a lens group and a first aperture, and the lens group and the first aperture are sequentially arranged along the transmission direction of the light path, wherein: The lens group is used to expand and collimate the laser beam emitted by the laser; The first aperture is used to limit the size of the laser beam.

3. According to claim 2, an optical dual-channel parallel information encryption device based on DMD, characterized in that: The Fourier surface image generation module includes a first DMD, a first Fourier lens and a second DMD, wherein the first DMD, the first Fourier lens and the second DMD are sequentially arranged along the transmission direction of the optical path, and the second DMD is placed at the focal plane position of the first Fourier lens, wherein: The first DMD is used to perform wavefront modulation processing on the laser beam, and select the 0th order diffraction image and the 1st order diffraction image as the original optical image; The first Fourier lens is used to perform Fourier transform processing on the original optical image to obtain a preliminary Fourier surface image; The second DMD is used to perform amplitude modulation on the preliminary Fourier surface image to obtain a Fourier surface image.

4. According to claim 3, an optical dual-channel parallel information encryption device based on DMD, characterized in that: The first ciphertext image generation module includes a second aperture, a second Fourier lens and a first CCD camera, wherein the second aperture, the second Fourier lens and the first CCD camera are sequentially arranged along the transmission direction of the light path, and the first CCD camera is placed on the focal plane of the second Fourier lens, wherein: The second aperture is used to filter the Fourier surface image to generate a 0th order Fourier surface image; The second Fourier lens is used to perform inverse Fourier transform processing on the 0th-level Fourier surface image to generate a 0th-level ciphertext image; The first CCD camera is used to collect the generated level 0 ciphertext image.

5. The optical dual-channel parallel information encryption device based on DMD according to claim 4, characterized in that: The second ciphertext image generation module includes a third aperture, a third Fourier lens and a second CCD camera, wherein the third aperture, the third Fourier lens and the second CCD camera are sequentially arranged along the transmission direction of the light path, and the second CCD camera is placed on the focal plane of the third Fourier lens, wherein: The third aperture is used to filter the Fourier surface image to generate a first-order Fourier surface image; The third Fourier lens is used to perform inverse Fourier transform processing on the first-level Fourier surface image to generate a first-level ciphertext image; The second CCD camera is used to collect the generated first-level ciphertext image.

6. An optical dual-channel parallel information encryption method based on DMD, characterized in that: The following steps are involved: Acquire a laser beam for preprocessing to obtain a preprocessed laser beam; Performing wavefront modulation, Fourier transform and amplitude modulation processing on the pre-processed laser beam to obtain a Fourier surface image; Performing a copy process on the Fourier surface image to obtain a first Fourier surface image and a second Fourier surface image; Filtering and inverse Fourier transforming the first Fourier surface image to generate a 0th-level ciphertext image; The second Fourier surface image is filtered and inverse Fourier transformed to generate a first-level ciphertext image.

7. The optical dual-channel parallel information encryption method based on DMD according to claim 6, characterized in that: The step of obtaining the laser beam for preprocessing to obtain the preprocessed laser beam specifically includes: The laser beam emitted by the laser is expanded and collimated to obtain a preliminary pre-processed laser beam; the preliminary pre-processed laser beam is subjected to beam size adjustment to obtain a pre-processed laser beam.

8. The optical dual-channel parallel information encryption method based on DMD according to claim 7, characterized in that: The step of performing wavefront modulation, Fourier transform and amplitude modulation processing on the pre-processed laser beam to obtain the Fourier surface image specifically includes: Performing wavefront modulation processing on the pre-processed laser beam, and selecting the 0th order diffraction image and the 1st order diffraction image as original optical images; Perform Fourier transform processing on the original optical image to obtain a preliminary Fourier surface image; The preliminary Fourier surface image is amplitude modulated to obtain a Fourier surface image.

9. The optical dual-channel parallel information encryption method based on DMD according to claim 8, characterized in that: The step of filtering and inverse Fourier transforming the first Fourier surface image to generate a level 0 ciphertext image specifically includes: Performing filtering processing on the first Fourier surface image to generate a 0th-order Fourier surface image; Perform inverse Fourier transform processing on the 0th level Fourier surface image to generate a 0th level ciphertext image; Collect and generate the level 0 ciphertext image.

10. The optical dual-channel parallel information encryption method based on DMD according to claim 9, characterized in that: The step of filtering and inverse Fourier transforming the second Fourier surface image to generate the first-level ciphertext image specifically includes: Performing filtering processing on the second Fourier surface image to generate a first-order Fourier surface image; Performing inverse Fourier transform processing on the first-level Fourier surface image to generate a first-level ciphertext image; Collect the generated level 1 ciphertext image.

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