CN113918962A - Optical information security system based on foveological duplex optical key - Google Patents
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Abstract
The invention provides an optical information security system based on a foveal duplex optical key, which comprises an optical information encryption module and an optical information decryption module. In the optical information encryption module, the first encryption spatial light modulator generates a small concave area in an imaging area needing to be encrypted, and the second encryption spatial light modulator performs secondary encryption under the action of the small concave area, so that local and double encryption of image information can be realized, and the flexibility, the real-time performance and the safety of the system are improved. The invention has an imaging optical module, gets rid of the dependence of the prior art on parallel beams, and increases the practicability. Meanwhile, the local encryption mode is also beneficial to improving the real-time performance of the system. The invention introduces the small concave area through the action of the spatial light modulator to realize the encryption of image information, and the position and the mode of the small concave area are controllable, so the system has a large key space, and can realize one-time pad to achieve higher security.
Description
Technical Field
The invention relates to the technical field of optical instruments, in particular to an optical information security system based on a foveola doublet optical key.
Background
In recent years, data encryption and information hiding technologies based on optical theory and method are a new generation of information security technology which is starting to develop internationally, and an optical instrument adopting such technologies is called an optical information security system.
However, the existing optical information security system basically uses parallel light beams as information carriers, and the parallel light beams firstly irradiate an image to be encrypted, which is generated in advance, so that the parallel light beams carry plaintext information to be encrypted, and then the optical encryption system is used for processing the plaintext information carried by the parallel light beams to obtain a ciphertext, so that the optical imaging system cannot directly become a component of the optical information security system, and the practicability of the optical information security system is greatly influenced. Meanwhile, the vast majority of current optical information security systems encrypt a whole image, which undoubtedly increases the demand of the optical information security system combined with digital computation on computer computing resources and reduces the real-time performance of the system. For the remaining few optical information security systems capable of realizing local encryption, although the bandwidth requirement of the system is reduced and the real-time performance of the system is improved, the problems that the area and the position of a local encryption region are fixed, the number is single, and sensitive information distributed in different regions, different numbers and different areas in the same image cannot be encrypted in parallel according to the actual encryption requirement exist.
Therefore, there is a need for an optical information security system capable of implementing dual encryption of local images, which can satisfy the requirement of performing parallel encryption on sensitive information distributed in different areas, different quantities, and different areas in the same image on the premise of guaranteeing the real-time performance and practicability of the system.
Disclosure of Invention
In view of the above, the present invention provides an optical information security system based on a foveal duplex optical key, which can realize the duplex encryption of a partial image and does not need a parallel light beam as an information carrier of an image to be encrypted.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an optical information security system based on a foveal duplex optical key comprises an optical information encryption module and an optical information decryption module.
The optical information encryption module is formed by coaxially and sequentially placing an imaging optical module, a first encryption spatial light modulator, a first relay module, a second encryption spatial light modulator, a second relay module and an encryption photoelectric detector.
The optical information decryption module is formed by coaxially and sequentially placing a collimation light source, a first decryption spatial light modulator, a second decryption spatial light modulator and a decryption photoelectric detector.
In the optical information encryption module, a first encryption spatial light modulator is positioned at the image surface position of the imaging optical module, an image light beam passes through the first encryption spatial light modulator, a first spatial light modulation distribution function is set to perform phase modulation on the image light beam in a specific area, and a small concave area is generated in an imaging area needing to be encrypted; the first relay module performs secondary imaging on an output image of the first encryption spatial light modulator; the second encryption spatial light modulator is positioned at the position of the secondary image surface, the encrypted image light beam passes through the second encryption spatial light modulator, a second spatial light modulation distribution function is set to perform phase modulation on the image light beam in a specific area, a small concave area is generated in the imaging area needing to be encrypted, and secondary encryption is performed on the imaging area needing to be encrypted under the action of the small concave area; the second relay module performs three times of imaging on an output image of the second encryption spatial light modulator and forms a final image surface on the encryption photoelectric detector; the encryption photoelectric detector is connected with the PC end, and the decryption photoelectric detector is connected with the PC end.
The PC terminal performs mathematical operation according to the known first spatial light modulation distribution function, the known second spatial light modulation distribution function and the known position distribution of the small concave area to obtain a comprehensive encryption key and inverts the comprehensive encryption key to obtain a decryption key; the first decryption spatial light modulator is used for intensity modulation, so that the illumination light beam becomes an image to be decrypted; the second decryption spatial light modulator is used for loading the decryption key and decrypting the image to be decrypted.
In the optical information decryption module, a collimation light source provides an illumination light beam, a first decryption spatial light modulator modulates the intensity of the illumination light beam according to the intensity distribution condition on an encryption photoelectric detector, a second decryption spatial light modulator modulates the phase of the modulated illumination light beam according to a decryption key, the decryption photoelectric detector receives an image to be decrypted formed by the decrypted illumination light beam, and in the decryption process, the position distribution of small concave regions generated on the second decryption spatial light modulator is the same as the position distribution of small concave regions subjected to secondary encryption.
Further, the position distribution of the pits on the first encryption spatial light modulator is determined by a first spatial light modulation distribution function, and the position distribution of the pits on the second encryption spatial light modulator is determined by a second spatial light modulation distribution function.
Further, the encryption photodetector is disposed at an image plane of the optical encryption module, and the decryption photodetector is disposed at an image plane of the optical decryption module.
Further, the first relay module and the second relay module are relay imaging lens groups.
Further, the optical information security system based on the foveal duplex optical key does not require a parallel beam as an information carrier for the image to be encrypted.
Further, the collimated light source provides an illumination beam, and the illumination beam is subjected to aperture enlargement by the two convex lenses and then is incident on the first decryption spatial light modulator.
Has the advantages that: the invention provides an optical information security system based on a foveal doublet optical key, which comprises an optical information encryption module and an optical information decryption module, is used for encrypting optical information of a general imaging optical system, and improves the practicability of the optical information security system. In the optical information encryption module, a first encryption spatial light modulator generates a small concave area in an imaging area needing encryption, and a second encryption spatial light modulator performs secondary encryption under the action of the small concave area, wherein the introduction of a small concave technology can realize local and double encryption of image information, and the flexibility, the real-time performance and the safety of a system are improved. The optical information encryption module has an imaging optical module, so that the dependence of the current optical information security system on parallel light beams is eliminated, and the practicability is improved. Meanwhile, the local encryption mode is also beneficial to improving the real-time performance of the system. The invention introduces the small concave area through the action of the spatial light modulator to realize the encryption of image information, and because the position and the mode of the small concave area are controllable, the invention carries out different encryptions on light in different light areas, so the system has a large key space, and can realize one-time pad to achieve higher security.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic diagram of an optical information encryption system.
Fig. 3 is a schematic diagram of the optical information decryption system.
The system comprises an imaging optical module 1, a first encryption spatial light modulator 2, a first relay module 3, a second encryption spatial light modulator 4, a second relay module 5, an encryption photoelectric detector 6, a collimation light source 7, a first decryption spatial light modulator 8, a second decryption spatial light modulator 9 and a decryption photoelectric detector 10.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an optical information security system based on a foveal duplex optical key, which includes an optical information encryption module and an optical information decryption module, and is used for optical information encryption of a general imaging optical system, thereby improving the practicability of the optical information security system. The introduction of the foveola technology can realize local and double encryption of image information, and improve the flexibility, real-time performance and safety of the system.
As shown in fig. 2, the optical information encryption module is formed by coaxially and sequentially placing an imaging optical module 1, a first encryption spatial light modulator 2, a first relay module 3, a second encryption spatial light modulator 4, a second relay module 5 and an encryption photodetector 6. The encryption photodetector 6 is placed at the image plane of the optical encryption module. The first relay module 3 and the second relay module 5 are relay imaging lens groups.
The imaging optical module 1 is used for image information acquisition; the first encryption spatial light modulator 2 and the second encryption spatial light modulator 4 are used for generating cells for encryption; the first relay module 3 and the second relay module 5 are used for transferring the intermediate image; the encrypted photodetector 6 is used to receive the encrypted image.
The first encryption spatial light modulator 2 is positioned at the image surface position of the imaging optical module 1, an image light beam passes through the first encryption spatial light modulator 2, a first spatial light modulation distribution function is set to perform phase modulation on the image light beam in a specific area, and a small concave area is generated in an imaging area needing to be encrypted; the first relay module 3 carries out secondary imaging on the output image of the first encryption spatial light modulator 2; the second encryption spatial light modulator 4 is located at the position of the secondary image surface, the encrypted image light beam passes through the second encryption spatial light modulator 4, a second spatial light modulation distribution function is set to perform phase modulation on the image light beam in a specific area, a small concave area is generated in the imaging area needing to be encrypted, and secondary encryption is performed on the imaging area needing to be encrypted under the action of the small concave area; the second relay module 5 images the output image of the second encrypted spatial light modulator 4 for three times, and forms a final image surface on the encrypted photoelectric detector 6; the encrypted photoelectric detector 6 is connected with the PC end, and the image to be decrypted is received by the encrypted photoelectric detector 6 and is transmitted to the PC end. The PC side has the existing optical driving software to control the imaging of the spatial light modulator, and controls the transmittance of the first decryption spatial light modulator 8 according to the intensity distribution (i.e., gray scale distribution) of the image, so that the intensity distribution of the illumination light beam is consistent with the image to be decrypted after passing through the first decryption spatial light modulator 8.
The PC performs mathematical operation according to the known first spatial light modulation distribution function, the known second spatial light modulation distribution function, and the known position distribution of the fovea, obtains a comprehensive encryption key and inverts the comprehensive encryption key, obtains a decryption key, and loads the decryption key onto the second decryption spatial light modulator 9. The specific mathematical operation method comprises the following steps: and substituting the position of the specific small concave region into the corresponding spatial modulation distribution function to generate a phase diagram, and performing convolution operation on the two phase diagrams to obtain a comprehensive encryption key.
As shown in fig. 3, the optical information decryption module is formed by coaxially and sequentially placing a collimated light source 7, a first decryption spatial light modulator 8, a second decryption spatial light modulator 9 and a decryption photodetector 10. The collimation light source 7 provides an illumination light beam, the PC end loads the intensity distribution on the encryption photoelectric detector 6 to the first decryption spatial light modulator 8, so that the illumination light beam is subjected to intensity modulation to form an image to be decrypted with the intensity distribution consistent with the final image surface intensity distribution of the optical information encryption module when passing through the first decryption spatial light modulator 8. In the optical information decryption module, a first decryption spatial light modulator 8 modulates the intensity of an illumination beam according to the intensity distribution on an encryption photoelectric detector 6, a second decryption spatial light modulator 9 modulates the phase of the modulated illumination beam according to a decryption key, a decryption photoelectric detector 10 receives an image formed by the decrypted illumination beam, and in the decryption process, the position distribution of small recesses generated on the second decryption spatial light modulator 9 is the same as the position distribution of small recesses subjected to secondary encryption.
In the embodiment of the present invention, the position distribution of the pits on the first encryption spatial light modulator 2 is determined by the first spatial light modulation distribution function, and the position distribution of the pits on the second encryption spatial light modulator 4 is determined by the second spatial light modulation distribution function.
The specific working mode of the system is as follows: the external object light rays are converged on a first encryption spatial light modulator 2 placed at the position of an intermediate image after passing through an imaging optical module 1, a small concave area is generated in an area needing to be encrypted by the first encryption spatial light modulator 2, aberration is introduced to modulate a spherical wave surface, modulated spherical waves are subjected to secondary imaging through a first relay module 3, the formed secondary image is on a second encryption spatial light modulator 4, double local encryption is realized on the image under the action of the small concave area, after the double local encryption is completed, the divergent spherical waves are converged on an encryption photoelectric detector 6 again through a second relay module 5, and the process of obtaining the encrypted image is completed.
Since the encryption keys used for modulating the spherical wave are different but the modulation processes are the same in the first encryption spatial light modulator 2 and the second encryption spatial light modulator 4, the principle part only introduces the modulation principle on the first encryption spatial light modulator 2.
The encryption process of the system is that spherical waves emitted by object points on an object surface pass through the imaging optical module 1 and are converged on a primary image surface in a spherical wave form to form a primary intermediate image. Considering that the actual imaging contains aberration, in order to simplify the analysis process, the imaging optical module 1 is equivalent to an equivalent lens with aberration, and the complex amplitude transmittance is:
wherein, (xi, η) is a coordinate system where the lens is located, P (xi, η) is a pupil function, f is an equivalent lens focal length, and W (xi, η) is a phase delay function introduced by aberration of the imaging optical module 1.
Coordinate system (x) of the object point0,y0) The complex amplitude distribution function on the object plane is U0(x0,y0) And the distance from the equivalent lens is d0Let the coordinate system of the primary image plane be (x)1,y1) The complex amplitude distribution function thereon is U1(x1,y1) And the distance from the equivalent lens is d1Building U by using Fresnel diffraction formula1(x1,y1) And U0(x0,y0) The corresponding relation of (2) can be obtained by simplifying:
wherein,
is the magnification, h, of the equivalent lens of the imaging optical module 11(x1,y1) Is composed of
I.e. the impulse response function of the imaging optics module 1 containing aberrations.
Therefore, after passing through the imaging optical module 1 containing aberration, the light field distribution on the primary image plane of the system is equivalent to the convolution of geometric optical ideal and system impulse response. The action mode of the aberration carried by the system is to convert the pupil function of the system into a pupil function in a complex domain, and finally realize the modulation of the complex amplitude distribution of the incident light field in the mode of a system impulse response function.
Since all the spatial light modulators in the system are placed close to the primary image plane, it is considered that all the spatial light modulators perform point-to-point modulation on the complex amplitude distribution on the primary image plane, and the thickness of the spatial light modulators is ignored. The complex amplitude distribution function of its output light field after modulation by the spatial light modulator can be expressed as:
U'1(x1,y1)＝U1(x1,y1)SLM(x1,y1) (3)
wherein, SLM (x)1,y1) And the modulation distribution function of the spatial light modulator is represented, and the complex amplitude distribution function of the light field on the primary image surface of the system is changed under the action of the modulation distribution function, namely the introduction process of local aberration is realized.
U1(x1,y1) After being modulated by the spatial light modulator, under the action of aberration, the image is formed on a secondary image surface through a relay module in an encryption system in the form of distorted spherical waves, and a Fresnel diffraction formula is utilized again, so that a complex amplitude distribution function on the secondary image surface is obtained as follows:
wherein,
M2for the magnification of the backend system, (x)2,y2) Is a coordinate system of the quadratic image plane, h2As a function of the impulse response of the relay module.
The combined type (2) and (4) can be obtained by arranging:
therefore, the image encryption is realized through the aberration, and the process that the spatial light modulator introduces the aberration to control the pulse response function of a back-end system and finally obtain the required light field complex amplitude distribution on the image surface is substantial.
Since all spatial light modulators can generate a specific phase pattern on any area thereof, pits can be generated on specific local areas using the spatial light modulators, i.e. different pits will have different spatial light modulator modulation distribution functions. Under the action of the modulation distribution function of the spatial light modulator, the modification of the phase information of the spherical wave can be realized, and finally the purpose of carrying out fuzzy processing on the image information carried by the spherical wave is realized. In the system, the spatial light modulator is used for carrying out secondary control on the impulse response function of the system, namely, the double optical key encryption effect provided by the information security system is realized.
According to the principle, the general imaging system is used as a component of the optical information safety system, so that the dependence of the current optical information safety system on parallel beams is eliminated, and the practicability is improved. Meanwhile, the local encryption mode is also beneficial to improving the real-time performance of the system. The invention introduces the fovea through the action of the spatial light modulator to realize the encryption of image information, and the encryption method is the reverse of the fovea technology. Because the position and mode of the small concave area are controllable, and different encryptions are carried out on the light of different light areas, the system has a large key space, and can realize one-time pad to achieve higher security
When decryption is performed, because the system adopts a secondary encryption process, two correct fovea are required to be generated on the second decryption spatial light modulator 9 in the decryption system, so that complete decryption of the image can be realized, otherwise, only a part of correct images or completely wrong images can be obtained.
In the embodiment of the invention, the optical information encryption system comprises an imaging system without a parallel light generating device, and the information carrier is non-parallel light, so that the optical information encryption system is different from the conventional optical information encryption system in that the parallel light is required to be used as an information carrier, and can be widely applied to the fields of laser communication, bank security authentication and the like.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An optical information security system based on a foveal duplex optical key is characterized by comprising an optical information encryption module and an optical information decryption module;
the optical information encryption module is formed by coaxially and sequentially placing an imaging optical module (1), a first encryption spatial light modulator (2), a first relay module (3), a second encryption spatial light modulator (4), a second relay module (5) and an encryption photoelectric detector (6);
the optical information decryption module is formed by coaxially and sequentially placing a collimation light source (7), a first decryption spatial light modulator (8), a second decryption spatial light modulator (9) and a decryption photoelectric detector (10);
in the optical information encryption module, a first encryption spatial light modulator (2) is positioned at the image surface position of the imaging optical module (1), an image beam passes through the first encryption spatial light modulator (2), a first spatial light modulation distribution function is set to perform phase modulation on the image beam in a specific area, and a small concave area is generated in an imaging area needing to be encrypted; the first relay module (3) carries out secondary imaging on an output image of the first encryption spatial light modulator (2); the second encryption spatial light modulator (4) is located at the position of a secondary image surface, the encrypted image light beam passes through the second encryption spatial light modulator (4), a second spatial light modulation distribution function is set to perform phase modulation on the image light beam in a specific area, a small concave area is generated in an imaging area needing to be encrypted, and secondary encryption is performed on the imaging area needing to be encrypted under the action of the small concave area; the second relay module (5) images the output image of the second encryption spatial light modulator (4) for three times, and a final image surface is formed on the encryption photoelectric detector (6); the encryption photoelectric detector (6) is connected with a PC end, and the decryption photoelectric detector (10) is connected with the PC end;
the PC terminal performs mathematical operation according to the known first spatial light modulation distribution function, the known second spatial light modulation distribution function and the known position distribution of the small concave area to obtain a comprehensive encryption key and inverts the comprehensive encryption key to obtain a decryption key; the first decryption spatial light modulator (8) is used for intensity modulation, so that the illumination light beam becomes an image to be decrypted; the second decryption spatial light modulator (9) is used for loading a decryption key and decrypting an image to be decrypted;
in the optical information decryption module, a collimation light source (7) provides an illumination light beam, a first decryption spatial light modulator (8) performs intensity modulation on the illumination light beam according to the intensity distribution condition on an encryption photoelectric detector (6), a second decryption spatial light modulator (9) performs phase modulation on the modulated illumination light beam according to a decryption key, a decryption photoelectric detector (10) receives an image to be decrypted formed by the decrypted illumination light beam, and in the decryption process, the position distribution of small concave regions generated on the second decryption spatial light modulator (9) is the same as the position distribution of small concave regions subjected to secondary encryption.
2. The system according to claim 1, wherein the distribution of the location of the pits on the first encrypting spatial light modulator (2) is determined by a first spatial light modulation distribution function and the distribution of the location of the pits on the second encrypting spatial light modulator (4) is determined by a second spatial light modulation distribution function.
3. The system according to claim 2, characterized in that said encryption photodetector (6) is placed at the image plane of said optical encryption module and said decryption photodetector (10) is placed at the image plane of said optical decryption module.
4. A system according to claim 3, characterized in that said first relay module (3) and second relay module (5) are relay imaging lens groups.
5. The system of claim 1, wherein the foveal duplex optical key-based optical information security system does not require a parallel beam of light as an information carrier for an image to be encrypted.
6. A system as claimed in claim 1, characterized in that the collimated light source (7) provides an illumination beam which is enlarged in aperture by two convex lenses and is incident on the first decrypting spatial light modulator (8).
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