CN113918962B - Optical information security system based on concave double optical key - Google Patents
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Abstract
The invention provides an optical information security system based on a concave double 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 encryption, 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, instantaneity and safety of the system are improved. The invention has the own imaging optical module, gets rid of the dependence of the current technology on parallel light 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 to realize the encryption of the image information through the action of the spatial light modulator, and the system has a large key space because the position and the mode of the small concave area are controllable, and can realize one-time encryption so as 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 concave double optical key.
Background
In recent years, the data encryption and information hiding technology based on the optical theory and method is a new generation of information security technology which is developed internationally, and an optical instrument adopting the technology is called an optical information security system.
However, the existing optical information security systems basically use parallel light beams as information carriers, and the parallel light beams are used for irradiating the image to be encrypted, 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 part of parallel light beams to obtain ciphertext, so that the optical imaging system cannot be directly used as a component of the optical information security system, and the practicability of the optical information security system is greatly influenced. Meanwhile, most of the current optical information security systems encrypt an entire image, which undoubtedly increases the demand of the optical information security system combined with digital calculation on the computer computing power resource and reduces the real-time performance of the system. While the rest optical information security system capable of realizing local encryption reduces the bandwidth requirement of the system and improves the real-time performance of the system, the problems that the area and the position of a local encryption area are fixed, the quantity is single, and the sensitive information distributed in different areas, different quantities 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 double encryption of partial images, which can meet the requirement of parallel encryption of sensitive information distributed in different areas, different amounts and different areas in the same image on the premise of ensuring the real-time performance and practicality of the system.
Disclosure of Invention
In view of this, the present invention provides an optical information security system based on a concave dual optical key, which is capable of realizing dual encryption of a partial image without requiring a parallel light beam as an information carrier of an image to be encrypted.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an optical information security system based on a concave double 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 arranging 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 arranging 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 an image plane position of an imaging optical module, an image beam passes through the first encryption spatial light modulator, a first spatial light modulation distribution function is set for carrying out phase modulation on the image beam in a specific area, and a small concave area is generated in the imaging area needing encryption; the first relay module performs secondary imaging on an output image of the first encrypted 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 carry out phase modulation on the image light beam in a specific area, a small concave area is generated in an imaging area needing encryption, and the imaging area needing encryption is subjected to secondary encryption under the action of the small concave area; the second relay module performs three-time imaging on the output image of the second encryption spatial light modulator, and forms a final image plane 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 end performs mathematical operation according to the known first spatial light modulation distribution function, the second spatial light modulation distribution function and the 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 to enable the illumination beam to be an image to be decrypted; the second decryption spatial light modulator is used for loading a decryption key and decrypting the image to be decrypted.
In the optical information decryption module, a collimation light source provides illumination light beams, a first decryption spatial light modulator carries out intensity modulation on the illumination light beams according to the intensity distribution condition on an encryption photoelectric detector, a second decryption spatial light modulator carries out phase modulation on the modulated illumination light beams according to a decryption secret key, the decryption photoelectric detector receives an image to be decrypted formed by the decrypted illumination light beams, and in the decryption process, the position distribution of a small concave area generated on the second decryption spatial light modulator is the same as the position distribution of the small concave area after secondary encryption.
Further, the distribution of the positions of the small cells on the first encrypted spatial light modulator is determined by a first spatial light modulation distribution function, and the distribution of the positions of the small cells on the second encrypted spatial light modulator is determined by a second spatial light modulation distribution function.
Further, the encryption photoelectric detector is placed at the image plane of the optical encryption module, and the decryption photoelectric detector is placed at the 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 concave dual optical key does not require a parallel light beam as an information carrier of the image to be encrypted.
Further, the collimated light source provides an illumination beam, which is expanded in caliber by the two convex lenses and is incident on the first decryption spatial light modulator.
The beneficial effects are that: the invention provides an optical information security system based on a concave double optical key, which comprises an optical information encryption module and an optical information decryption module, and is used for encrypting the optical information of a general imaging optical system, so that the practicability of the optical information security system is improved. 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 instantaneity and the safety of the system are improved. The optical information encryption module is provided with 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 to encrypt the image information by the action of the spatial light modulator, and the position and the mode of the small concave area are controllable to encrypt the light of different light areas, so the system has a large key space, and can realize one-time encryption to achieve higher security.
Drawings
FIG. 1 is a schematic diagram of a system according to the present invention.
Fig. 2 is a schematic diagram of an optical information encryption system.
Fig. 3 is a schematic diagram of an optical information decryption system.
The system comprises a 1-imaging optical module, a 2-first encryption spatial light modulator, a 3-first relay module, a 4-second encryption spatial light modulator, a 5-second relay module, a 6-encryption photoelectric detector, a 7-collimation light source, an 8-first decryption spatial light modulator, a 9-second decryption spatial light modulator and a 10-decryption photoelectric detector.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
As shown in fig. 1, the invention provides an optical information security system based on a concave dual optical key, which comprises an optical information encryption module and an optical information decryption module, and is used for encrypting optical information of a general imaging optical system, so that the practicability of the optical information security system is improved. The introduction of the fovea technology can realize local and double encryption of image information, and improves the flexibility, instantaneity and safety of the system.
As shown in fig. 2, the optical information encryption module is composed of 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 which are coaxially and sequentially placed. 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 collecting image information; the first encryption spatial light modulator 2 and the second encryption spatial light modulator 4 are used for generating a small concave area for encryption; the first relay module 3 and the second relay module 5 are used for transmitting the intermediate image; the encryption photodetector 6 is used to receive the encrypted image.
The first encryption spatial light modulator 2 is positioned at the image plane 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 carry out phase modulation on the image beam in a specific area, and a small concave area is generated in an imaging area needing encryption; the first relay module 3 performs secondary imaging on the output image of the first encrypted spatial light modulator 2; the second encryption spatial light modulator 4 is positioned 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 carry out phase modulation on the image light beam in a specific area, a small concave area is generated in an imaging area needing encryption, and the imaging area needing encryption is subjected to secondary encryption under the action of the small concave area; the second relay module 5 performs imaging on the output image of the second encrypted spatial light modulator 4 three times, and forms a final image plane on the encrypted photodetector 6; the encryption photoelectric detector 6 is connected with the PC end, and the image to be decrypted is received by the encryption photoelectric detector 6 and transmitted to the PC end. The PC end has the existing optical driving software, controls 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 distribution) of the image, so that the intensity distribution is consistent with the image to be decrypted after the illumination beam passes through the first decryption spatial light modulator 8.
The PC end performs mathematical operation according to the known first spatial light modulation distribution function, the second spatial light modulation distribution function and the position distribution of the small concave area to obtain a comprehensive encryption key, inverts the comprehensive encryption key, obtains a decryption key and loads the decryption key to the second decryption spatial light modulator 9. The specific mathematical operation method is as follows: substituting the specific cell position into the corresponding spatial modulation distribution function to generate a phase diagram, and performing convolution operation on the two phase diagrams to obtain the comprehensive encryption key.
As shown in fig. 3, the optical information decryption module is composed of a collimated light source 7, a first decryption spatial light modulator 8, a second decryption spatial light modulator 9 and a decryption photodetector 10 which are coaxially and sequentially arranged. The collimated light source 7 provides illumination light beams, and the PC end loads the intensity distribution on the encryption photoelectric detector 6 onto the first decryption spatial light modulator 8, so that the illumination light beams are subjected to intensity modulation when passing through the first decryption spatial light modulator 8 to form an image to be decrypted, and the intensity distribution of the image is consistent with the final image plane intensity distribution of the optical information encryption module. In the optical information decryption module, the first decryption spatial light modulator 8 performs intensity modulation on the illumination light beam according to the intensity distribution on the encryption photoelectric detector 6, the second decryption spatial light modulator 9 performs phase modulation on the modulated illumination light beam according to the decryption key, the decryption photoelectric detector 10 receives an image formed by the decrypted illumination light beam, and in the decryption process, the cell position distribution generated on the second decryption spatial light modulator 9 is the same as the cell position distribution after secondary encryption.
In the embodiment of the present invention, the distribution of the positions of the cells on the first encrypted spatial light modulator 2 is determined by a first spatial light modulation distribution function, and the distribution of the positions of the cells on the second encrypted spatial light modulator 4 is determined by a second spatial light modulation distribution function.
The specific working mode of the system of the invention is as follows: external object light is converged on a first encryption spatial light modulator 2 placed at a middle image position after passing through an imaging optical module 1, the first encryption spatial light modulator 2 generates a small concave area in an area needing encryption, aberration is introduced to modulate a spherical wave surface, modulated spherical waves are imaged for the second time through a first relay module 3, the formed second image is on a second encryption spatial light modulator 4, double local encryption is achieved on an image through the action of the small concave area, and after the double local encryption is completed, the second relay module 5 converges divergent spherical waves on an encryption photoelectric detector 6 again to complete the acquisition process of the encrypted image.
Since the encryption keys used in modulating spherical waves are different but the modulation process is the same in the first encryption spatial light modulator 2 and the second encryption spatial light modulator 4, the principle section will only be described here for 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 plane pass through the imaging optical module 1 and are converged on a primary image plane in the form of spherical waves to form an intermediate image. In view of the fact 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, (ζ, η) is the coordinate system where the lens is located, P (ζ, η) is the pupil function, f is the equivalent lens focal length, and W (ζ, η) is the phase delay function introduced by the aberration of the imaging optical module 1.
Let the coordinate system of the object point be (x 0,y0), the complex amplitude distribution function on the object plane be U 0(x0,y0) and the distance from the equivalent lens be d 0, let the coordinate system of the primary image plane be (x 1,y1), the complex amplitude distribution function on the primary image plane be U 1(x1,y1) and the distance from the equivalent lens be d 1, and build the corresponding relation between U 1(x1,y1) and U 0(x0,y0) by using the Fresnel diffraction formula, and the method can be simplified to obtain:
Wherein, Magnification of equivalent lens for imaging optical module 1, h 1(x1,y1) is/>I.e. the impulse response function of the aberration-containing imaging optical module 1.
Thus, after passing through the aberration-containing imaging optical module 1, the light field distribution on the primary image plane of the present system is equivalent to the convolution of the geometric optical ideal with the system impulse response. The system itself has the function mode of aberration, which converts the pupil function of the system into the pupil function in complex domain, and finally realizes the modulation of the complex amplitude distribution of the incident light field in the mode of the impulse response function of the system.
Because all the spatial light modulators in the system are closely attached to the primary image plane, all the spatial light modulators are considered to 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 the 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)
the SLM (x 1,y1) represents the modulation distribution function of the spatial light modulator, and under the action of the function, the light field complex amplitude distribution function on the primary image surface of the system is changed, namely the introduction process of local aberration is realized.
U 1(x1,y1) is modulated by a spatial light modulator, and is imaged on a secondary image surface through a relay module in an encryption system in the form of distorted spherical waves under the action of aberration, and a Fresnel diffraction formula is utilized again to obtain a complex amplitude distribution function on the secondary image surface, wherein the complex amplitude distribution function is as follows:
Wherein, M 2 is the magnification of the back-end system, (x 2,y2) is the coordinate system where the secondary image plane is located, and h 2 is the impulse response function of the relay module.
And (3) combining the two components (2) and (4), and finishing to obtain:
Therefore, the encryption of the image is realized through the aberration, which is a process of controlling the impulse response function of the back-end system by introducing the aberration by using the spatial light modulator, and finally obtaining the required light field complex amplitude distribution on the image plane.
Since all spatial light modulators can generate a specific phase pattern on any of their areas, small pits can be generated on specific local areas with the spatial light modulator, i.e. different small 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 spherical wave phase information 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, a spatial light modulator is used for carrying out secondary control on a system impulse response function, 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 part of the optical information security system, 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 to realize the encryption of the image information by the action of the spatial light modulator, and the encryption method is the inverse use of the small concave technology. Because the position and mode of the small concave area are controllable, different encryption is carried out on the light of different light areas, the system has a large key space, and one-time encryption can be realized to achieve higher security
When decryption is carried out, because the system adopts a secondary encryption process, two correct small concave areas 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 partial correct image or complete wrong image can be obtained.
In the embodiment of the invention, unlike the existing optical information encryption system which needs parallel light as an information carrier, the optical information encryption system comprises an imaging system, does not need a parallel light generating device, and can be widely applied to the fields of laser communication, bank security authentication and the like, wherein the information carrier is non-parallel light.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. 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 concave double 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 arranging 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 arranging 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 plane 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 carry out phase modulation on the image beam in a specific area, and a small concave area is generated in an imaging area needing encryption; the first relay module (3) performs secondary imaging on an output image of the first encryption spatial light modulator (2); the second encryption spatial light modulator (4) is positioned 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 carry out phase modulation on the image light beam in a specific area, a small concave area is generated in an imaging area needing encryption, and the imaging area needing encryption is subjected to secondary encryption 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 forms a final image plane on the encryption photoelectric detector (6); the encryption photoelectric detector (6) is connected with the PC end, and the decryption photoelectric detector (10) is connected with the PC end;
the PC end performs mathematical operation according to the known first spatial light modulation distribution function, the second spatial light modulation distribution function and the 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 beam becomes an image to be decrypted; the second decryption spatial light modulator (9) is used for loading a decryption key and decrypting the image to be decrypted;
in the optical information decryption module, a collimation light source (7) provides illumination light beams, a first decryption spatial light modulator (8) carries out intensity modulation on the illumination light beams according to the intensity distribution condition on an encryption photoelectric detector (6), a second decryption spatial light modulator (9) carries out phase modulation on the modulated illumination light beams according to a decryption secret key, a decryption photoelectric detector (10) receives images to be decrypted formed by the decrypted illumination light beams, and in the decryption process, the cell position distribution generated on the second decryption spatial light modulator (9) is identical to the cell position distribution after secondary encryption.
2. A system as claimed in claim 1, characterized in that the distribution of cell locations on the first encrypted spatial light modulator (2) is determined by a first spatial light modulation distribution function and the distribution of cell locations on the second encrypted spatial light modulator (4) is determined by a second spatial light modulation distribution function.
3. A system as claimed in claim 2, characterized in that the encryption photodetector (6) is placed at the image plane of the optical information encryption module and the decryption photodetector (10) is placed at the image plane of the optical information decryption module.
4. A system according to claim 3, characterized in that the first relay module (3) and the second relay module (5) are relay imaging lens groups.
5. The system of claim 1, wherein the optical information security system based on a concave dual optical key does not require a parallel light beam as an information carrier for the 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 diameter by two convex lenses and is incident on the first decryption spatial light modulator (8).
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| CN102520602A (en) * | 2011-11-08 | 2012-06-27 | 浙江师范大学 | Two-step quadrature phase-shift interferometry-based optical image encryption device and method |
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| CN106972921A (en) * | 2017-01-03 | 2017-07-21 | 北京理工大学 | The asymmetrical optical information safety system of double optical key is combined based on wavefront sensing |
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| US6907124B1 (en) * | 1998-07-03 | 2005-06-14 | Forskningscenter Riso | Optical encryption and decryption method and system |
| CN102520602A (en) * | 2011-11-08 | 2012-06-27 | 浙江师范大学 | Two-step quadrature phase-shift interferometry-based optical image encryption device and method |
| CN103258315A (en) * | 2013-05-24 | 2013-08-21 | 浙江农林大学 | Double-image encryption method based on tangential fractional Fourier transformation |
| CN106972921A (en) * | 2017-01-03 | 2017-07-21 | 北京理工大学 | The asymmetrical optical information safety system of double optical key is combined based on wavefront sensing |
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