CN108663800B - Optical encryption and decryption method, device and system - Google Patents
Optical encryption and decryption method, device and system Download PDFInfo
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Abstract
The invention discloses an optical encryption and decryption method, device and system, wherein the method comprises the following steps: optically modulating a monochromatic laser beam in a measuring light path to obtain a prefabricated coherent light source, wherein the prefabricated coherent light source corresponds to the light intensity of incident light; acquiring the transmission light intensity corresponding to the target object after the prefabricated coherent light source transmits the target object, and calculating the transmittance of the target object according to the transmission light intensity and the incident light intensity; encrypting the target object according to a preset encryption formula according to the transmissivity of the target object and the light intensity of the reference light path; and carrying out decryption operation on the target object according to a preset decryption formula according to the transmission light intensity in the measuring light path and the light intensity in the reference light path. The optical encryption and decryption method provided by the invention has higher encryption efficiency and confidentiality, and improves the practical application performance.
Description
Technical Field
The present invention relates to the field of optical information security, and in particular, to an optical encryption and decryption method, apparatus, and system.
Background
With the rapid development of computer technology, cloud computing, internet of things and other technologies, China has entered the big data age of the internet at present. How to ensure the effective transmission of a large amount of data and the information security of the data becomes a great problem in the field of current information technology. In recent years, a new optical encryption technology has attracted general attention, and has been widely used in the fields of information security and image encryption due to the characteristics of encryption in multiple dimensions, such as phase, wavelength, and frequency. In order to further improve the anti-interference performance of the optical encryption technology, an optical encryption technology based on thermo-optic correlation has been recently proposed.
The thermo-optical correlation-based optical encryption technology completes the encryption and decryption processes of a target object by means of the intensity fluctuation correlation of two optical paths. Specifically, the method comprises the following steps: (1) one light path is subjected to total light intensity measurement by a single-pixel detector after passing through an object, the light path is called a test light path, and the single-pixel detector only performs light total intensity measurement on the object and does not perform spatial resolution, so that the process can be regarded as a process of encrypting a target object; (2) the other light path is propagated through free space and then is subjected to intensity measurement by a surface detector, and the light path is called a reference light path. By performing correlation operation on the intensity signals detected by the two optical paths, the image information of the target object can be recovered, and the process can be similar to optical decryption. Because the single-pixel detector without resolution capability is used in the encryption process, the defect of information distortion caused by using a surface detector which is easily interfered by environmental factors in the traditional optical encryption system is avoided.
However, the above-mentioned optical encryption technology based on thermo-optic correlation has at least the following technical problems in practical application:
(1) due to the non-orthogonal characteristic of the thermal light source, a large amount of data needs to be repeatedly acquired when the target object is subjected to once high-quality optical encryption, so that the information encryption efficiency of the system is low;
(2) since the distribution characteristics of the thermal light source can change with different propagation distances, the encryption of the remote target object and the dynamic object is not facilitated.
Disclosure of Invention
Therefore, the present invention is directed to at least one of the above technical problems, and more particularly to an optical encryption and decryption method, apparatus and system for securely processing information of a remote target object.
The invention provides an optical encryption and decryption method, wherein at least two optical paths are arranged, the optical paths comprise a measuring optical path and a reference optical path, and the method comprises the following steps:
optically modulating the monochromatic laser beam in the measuring light path to obtain a prefabricated coherent light source, wherein the prefabricated coherent light source corresponds to the light intensity of incident light;
acquiring the corresponding transmission light intensity of the prefabricated coherent light source after the prefabricated coherent light source transmits the target object, and calculating the transmissivity of the target object according to the transmission light intensity and the incident light intensity;
encrypting the target object according to a preset encryption formula according to the transmissivity of the target object and the light intensity of the reference light path;
and carrying out decryption operation on the target object according to a preset decryption formula according to the transmission light intensity in the measuring light path and the light intensity in the reference light path.
The optical encryption and decryption method provided by the invention comprises the steps of firstly, carrying out optical modulation on a traditional monochromatic laser beam to obtain a prefabricated coherent light source, then irradiating the prefabricated coherent light source on a target object in a measuring light path, and calculating according to the front and rear light intensities to obtain the transmissivity of the target object; then, the target object is encrypted according to the transmissivity and the light intensity of the reference light path; in addition, the target object can be decrypted according to the light intensity in the reference light path and the transmitted light intensity. In the invention, due to the orthogonal characteristic of the obtained prefabricated coherent light source, the sampling times can be greatly reduced, thereby realizing high-efficiency optical encryption and being beneficial to encrypting a dynamic object; in addition, the prefabricated coherent light source has translation invariance, so that the distribution characteristics of the light intensity are not changed after the light intensity is transmitted in a long distance, and the remote object can be encrypted.
The optical encryption and decryption method, wherein the method further comprises:
and when the propagation distance to the reference light path is judged to be equal to the distance between the prefabricated coherent light source and the target object, performing the encryption operation or the decryption operation on the target object.
The optical encryption and decryption method comprises the following steps of obtaining the expression of the incident light intensity of the prefabricated coherent light source after modulation:
wherein the content of the first and second substances,
j is a complex number, n is the frequency of light source generation, and tau is the period of the prefabricated coherent light source.
The optical encryption and decryption method is characterized in that the expression of the light intensity of the reference light path is as follows:
wherein the content of the first and second substances,
and a is a correction parameter related to the propagation distance of the reference light path.
The optical encryption and decryption method is characterized in that the target object is encrypted in the measuring optical path, and the expression of the preset encryption formula is as follows:
wherein the content of the first and second substances,
t (x) is the transmittance of the target object, which is the intensity of light detected in the measurement optical path during encryption.
The optical encryption and decryption method is characterized in that the expression of the preset decryption formula is as follows:
where o (x) is image information of the target object, < B > is an average value of light intensities detected in the measurement optical path, and N is a total number of measurements.
The optical encryption and decryption method is characterized in that the total number of measurement times is not more than 200.
The invention also provides an optical encryption and decryption device, wherein at least two optical paths are arranged, the optical paths comprise a measurement optical path and a reference optical path, and the device comprises:
the optical modulation module is used for optically modulating the monochromatic laser beam in the measuring light path to obtain a prefabricated coherent light source, and the prefabricated coherent light source corresponds to the light intensity of incident light;
the optical calculation module is used for acquiring the corresponding transmission light intensity of the prefabricated coherent light source after the prefabricated coherent light source transmits a target object, and calculating the transmissivity of the target object according to the transmission light intensity and the incident light intensity;
the optical encryption module is used for encrypting the target object according to a preset encryption formula according to the transmissivity of the target object and the light intensity of the reference light path;
and the optical decryption module is used for decrypting the target object according to a preset decryption formula according to the transmission light intensity in the measuring light path and the light intensity in the reference light path.
The invention also provides an optical encryption and decryption system, wherein at least two optical paths are provided, including a measurement optical path and a reference optical path, and the system comprises: a laser for generating a monochromatic laser beam, a spatial light modulator for optically modulating the monochromatic laser beam and a single pixel detector for receiving the transmitted light, said system applying the optical encryption and decryption method as described above.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flowchart of an optical encryption and decryption method according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an optical encryption and decryption system according to a second embodiment of the present invention;
FIG. 3 is an experimental image of a conventional thermal light source in a second embodiment of the present invention;
FIG. 4 is an experimental image of a target object decrypted using a conventional thermal light source in a second embodiment of the present invention;
FIG. 5 is an experimental image of a prefabricated coherent light source according to a second embodiment of the present invention;
FIG. 6 is an experimental image of a target object decrypted by a pre-fabricated coherent light source according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of an optical encryption and decryption apparatus according to a third embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the prior art, the distribution characteristics of the heat light source can change along with different propagation distances, which is not beneficial to realizing encryption of remote target objects and dynamic objects.
To solve the technical problem, the present invention provides an optical encryption and decryption method, please refer to fig. 1, for the optical encryption and decryption method provided by the first embodiment of the present invention, at least two optical paths are provided, including a measurement optical path and a reference optical path, which includes the following steps:
s101, carrying out optical modulation on the monochromatic laser beam in the measuring light path to obtain a prefabricated coherent light source, wherein the prefabricated coherent light source corresponds to the light intensity of incident light.
The light generated by the conventional thermal light source is a monochromatic laser beam, so as to avoid the influence on the encryption and decryption operation caused by the defects (non-orthogonal characteristic and thermal light source distribution characteristic) of the conventional thermal light source. In this embodiment, a spatial light modulator is used to optically modulate a monochromatic laser beam to obtain a pre-fabricated coherent light source. It should be noted that the above-mentioned prefabricated coherent light source is a complex exponential shaped coherent light source, which is arranged in the measuring light path, and it is understood that the complex exponential shaped coherent light source should have an incident light intensity.
S102, obtaining the corresponding transmission light intensity of the prefabricated coherent light source after the prefabricated coherent light source transmits the target object, and calculating the transmissivity of the target object according to the transmission light intensity and the incident light intensity.
In the present invention, we need to encrypt and decrypt a target object by using the obtained complex exponential shaping coherent light source. In the measuring light path, the complex exponential shaping coherent light source, that is, the prefabricated coherent light source, is irradiated on the target object.
It will be appreciated that after the complex exponentially shaped coherent light source illuminates the target object, the back side of the target object corresponds to a transmitted light intensity. Since the incident light intensity of the complex exponential shaping coherent light source is known, the transmittance of the target object can be calculated according to the transmitted light intensity and the incident light intensity.
S103, according to the transmissivity of the target object and the light intensity of the reference light path, carrying out encryption operation on the target object according to a preset encryption formula.
In the invention, two light paths are arranged, namely a measuring light path and a reference light path. After the transmittance of the target object is calculated and determined, the light intensity of the reference light path is known, so that the target object can be encrypted according to the transmittance of the target object and the light intensity of the reference light path.
And S104, carrying out decryption operation on the target object according to a preset decryption formula according to the transmission light intensity in the measuring light path and the light intensity in the reference light path.
As described above, the transmission light intensity in the measurement light path and the light intensity in the reference light path are known, and when decryption is performed, the target object can be decrypted according to the transmission light intensity and the light intensity in the reference light path to obtain image information of the target object.
The optical encryption and decryption method provided by the invention comprises the steps of firstly, carrying out optical modulation on a traditional monochromatic laser beam to obtain a prefabricated coherent light source, then irradiating the prefabricated coherent light source on a target object in a measuring light path, and calculating according to the front and rear light intensities to obtain the transmissivity of the target object; then, the target object is encrypted according to the transmissivity and the light intensity of the reference light path; in addition, the target object can be decrypted according to the light intensity in the reference light path and the transmitted light intensity. In the invention, due to the orthogonal characteristic of the obtained prefabricated coherent light source, the sampling times can be greatly reduced, thereby realizing high-efficiency optical encryption and being beneficial to encrypting a dynamic object; in addition, the prefabricated coherent light source has translation invariance, so that the distribution characteristics of the light intensity are not changed after the light intensity is transmitted in a long distance, and the remote object can be encrypted.
Referring to fig. 2 to 6, a detailed description is provided below for a second embodiment of the optical encryption and decryption method according to the present invention, which is implemented as follows:
the monochromatic laser beam is first optically modulated by a spatial light modulator to obtain a complex exponentially shaped coherent light source. The complex exponential shaping coherent light source corresponds to an incident light intensity, and the corresponding expression is as follows:
wherein the content of the first and second substances,
j is the complex number, n is the number of times the light source is generated, and τ is the period of the complex exponential shaped coherent light source.
In the measuring light path, the complex exponential shaping coherent light source irradiates on a target object, the target object has certain transmissivity, and a transmitted light intensity corresponds to the back of the target object. It will be appreciated that the transmittance of the target object may be calculated from the transmitted light intensity and the incident light intensity described above.
It should be noted that, in the present invention, two optical paths are provided, namely, the measurement optical path and the reference optical path. In the reference optical path, there is a light intensity of a reference optical path, and the light intensity of the reference optical path can be expressed by the following formula:
wherein the content of the first and second substances,
is the light intensity of the reference light path, and a is the propagation distance related to the reference light pathThe correction parameter of (1).
The present embodiment provides an optical encryption and decryption system, including: a laser 11 for generating a monochromatic laser beam, a spatial light modulator 12 for optically modulating the monochromatic laser beam, and a single pixel detector 14 for receiving the transmitted light. Further, a processor 15 for performing encryption and decryption calculations is included.
In the actual encryption process, a laser 11 in the measurement optical path generates a monochromatic laser beam, the monochromatic laser beam is irradiated on a spatial light modulator 12, the spatial light modulator 12 optically modulates the monochromatic laser beam to obtain a complex index type coherent light source, then a prefabricated complex index type coherent light source is irradiated on a target object 13, and transmitted light passing through the target object 13 is collected by a single-pixel detector 14. It should be noted here that the whole process described above needs to be repeated N times.
In the encrypting step, since the transmittance of the target object and the light intensity of the reference light path have been obtained, the processor 15 may encrypt according to the following formula:
wherein the content of the first and second substances,
t (x) is the transmittance of the target object, which is the intensity of light detected in the measurement light path during the encryption process.
In particular, when the propagation distance to the reference optical path is determined to be equal to the distance between the complex exponential coherent light source and the target object during the encryption operation, the encryption operation is performed on the target object.
In practical applications, it is also necessary to perform a decryption operation on an already encrypted object image. Specifically, in the present embodiment, the target object is decrypted according to the following formula:
where o (x) is image information of the target object, < B > is an average value of the detected light intensities in the measurement optical path, and N is the total number of measurements.
Fig. 3 shows an experimental image of a conventional thermal light source, when the light source is the conventional thermal light source, the total number of times of measurement is 10000, that is, N is 10000, information restoration can be achieved, and an image of a target object obtained after restoration is shown in fig. 4.
Fig. 5 shows an experimental image of a complex-exponential-type shaped coherent light source, when the light source is a complex-exponential-type shaped coherent light source, the total number of measurements is 200 times, that is, N is 200 times, information restoration can be achieved, and an image of a target object obtained after restoration is shown in fig. 6.
When fig. 4 and fig. 6 are compared together, it can be seen that: the complex exponential type shaping coherent light source can also realize the encryption and decryption of the target object, the total measurement times are greatly reduced, and the actual encryption and decryption efficiency is obviously improved.
The optical encryption and decryption method provided by the embodiment comprises the steps of firstly, carrying out optical modulation on a traditional monochromatic laser beam to obtain a prefabricated coherent light source, then irradiating the prefabricated coherent light source on a target object in a measuring light path, and calculating according to the light intensity before and after the prefabricated coherent light source, so as to obtain the transmissivity of the target object; then, the target object is encrypted according to the transmissivity and the light intensity of the reference light path; in addition, the target object can be decrypted according to the light intensity in the reference light path and the transmitted light intensity. In the invention, due to the orthogonal characteristic of the obtained prefabricated coherent light source, the sampling times can be greatly reduced, thereby realizing high-efficiency optical encryption and being beneficial to encrypting a dynamic object; in addition, the prefabricated coherent light source has translation invariance, so that the distribution characteristics of the light intensity are not changed after the light intensity is transmitted in a long distance, and the remote object can be encrypted.
Referring to fig. 7, for the optical encryption and decryption apparatus according to the third embodiment of the present invention, at least two optical paths are provided, including a measurement optical path and a reference optical path, and the apparatus includes an optical modulation module 21, an optical calculation module 22, an optical encryption module 23, and an optical decryption module 24, which are connected in sequence;
wherein the optical modulation module 21 is specifically configured to:
optically modulating the monochromatic laser beam in the measuring light path to obtain a prefabricated coherent light source, wherein the prefabricated coherent light source corresponds to the light intensity of incident light;
the optical computing module 22 is specifically configured to:
acquiring the corresponding transmission light intensity of the prefabricated coherent light source after the prefabricated coherent light source transmits the target object, and calculating the transmissivity of the target object according to the transmission light intensity and the incident light intensity;
the optical encryption module 23 is specifically configured to:
encrypting the target object according to a preset encryption formula according to the transmissivity of the target object and the light intensity of the reference light path;
the optical decryption module 24 is specifically configured to:
and carrying out decryption operation on the target object according to a preset decryption formula according to the transmission light intensity in the measuring light path and the light intensity in the reference light path.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. An optical encryption and decryption method, characterized in that at least two optical paths are provided, including a measurement optical path and a reference optical path, the method comprising the steps of:
optically modulating the monochromatic laser beam in the measuring light path to obtain a prefabricated coherent light source, wherein the prefabricated coherent light source is a complex index shaping coherent light source and corresponds to the light intensity of incident light;
the expression of the incident light intensity of the prefabricated coherent light source obtained after modulation is as follows:
wherein the content of the first and second substances,
the intensity of the incident light is j is a complex number, n is the frequency of light source generation, and tau is the period of the prefabricated coherent light source;
acquiring the corresponding transmission light intensity of the prefabricated coherent light source after the prefabricated coherent light source transmits the target object, and calculating the transmissivity of the target object according to the transmission light intensity and the incident light intensity;
encrypting the target object according to a preset encryption formula according to the transmissivity of the target object and the light intensity of the reference light path;
encrypting the target object in the measuring optical path, wherein the expression of the preset encryption formula is as follows:
wherein the content of the first and second substances,
(x) is the transmittance of the target object, which is the intensity of light detected in the measurement optical path during encryption,
is the light intensity of the reference light path;
carrying out decryption operation on the target object according to a preset decryption formula and the transmission light intensity in the measurement light path and the light intensity in the reference light path;
the expression of the preset decryption formula is as follows:
where o (x) is image information of the target object, < B > is an average value of light intensities detected in the measurement optical path, and N is a total number of measurements.
2. The optical encryption and decryption method of claim 1, wherein the method further comprises:
and when the propagation distance to the reference light path is judged to be equal to the distance between the prefabricated coherent light source and the target object, performing the encryption operation or the decryption operation on the target object.
3. The optical encryption and decryption method of claim 1, wherein the expression of the light intensity of the reference optical path is:
wherein a is a correction parameter related to the propagation distance of the reference optical path.
4. The optical encryption and decryption method of claim 1, wherein the total number of measurements is no more than 200.
5. An optical encryption and decryption apparatus, wherein at least two optical paths are provided, including a measurement optical path and a reference optical path, the apparatus comprising:
the optical modulation module is used for optically modulating the monochromatic laser beam in the measuring light path to obtain a prefabricated coherent light source, wherein the prefabricated coherent light source is a complex index shaping coherent light source and corresponds to the light intensity of an incident light;
the expression of the incident light intensity of the prefabricated coherent light source obtained after modulation is as follows:
wherein the content of the first and second substances,
the intensity of the incident light is j is a complex number, n is the frequency of light source generation, and tau is the period of the prefabricated coherent light source;
the optical calculation module is used for acquiring the corresponding transmission light intensity of the prefabricated coherent light source after the prefabricated coherent light source transmits a target object, and calculating the transmissivity of the target object according to the transmission light intensity and the incident light intensity;
the optical encryption module is used for encrypting the target object according to a preset encryption formula according to the transmissivity of the target object and the light intensity of the reference light path;
encrypting the target object in the measuring optical path, wherein the expression of the preset encryption formula is as follows:
wherein the content of the first and second substances,
(x) is the transmittance of the target object, which is the intensity of light detected in the measurement optical path during encryption,
is the light intensity of the reference light path;
the optical decryption module is used for decrypting the target object according to a preset decryption formula according to the transmission light intensity in the measuring light path and the light intensity in the reference light path;
the expression of the preset decryption formula is as follows:
where o (x) is image information of the target object, < B > is an average value of light intensities detected in the measurement optical path, and N is a total number of measurements.
6. An optical encryption and decryption system, wherein at least two optical paths are provided, including a measurement optical path and a reference optical path, the system comprising: a laser for generating a monochromatic laser beam, a spatial light modulator for optically modulating said monochromatic laser beam and a single pixel detector for receiving the transmitted light, said system applying the optical encryption and decryption method according to any one of the preceding claims 1 to 4.
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