A photochromic encryption system and its application in optical logic gate encryption

Abstract

The application discloses a kind of photochromic encryption system and its application in optical logic gate encryption, it is related to optical encryption technical field.The photochromic encryption system of the application includes carrier and the encryption information layer being arranged on carrier, the encryption information layer is formed by the combination of the coating area of four different encryption inks, the four different encryption inks are respectively: the mixture of DASA-1 and polyurethane solution;The mixture of DASA-2 and polyurethane solution;The mixture of DASA-3 and polyurethane solution;The mixture of DASA-2 and polystyrene.The photochromic encryption system of the application only needs to realize logic gate control by external light stimulation, without transmitting information by other signal carriers such as electron or other charged particles, compared with the existing logic gate element based on the principle of electronics, the information transmission speed is fast, and it is easier to implement, more conducive to the application of logic gate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical encryption technology, more particularly, to a photochromic encryption system and its application in optical logic gate encryption. BACKGROUND

[0002] Since the 1980s, with the rapid development of computers, the Internet and digital communication technology, China has begun to enter the information society. With the development of the information society, the era of big data containing diversified information systems has gradually occupied all fields of people's production, life and work. Big data combined with Internet of Things, cloud storage, cloud computing, cloud storage and other emerging technologies is the foundation of the construction of future smart cities. At the same time, with the increasingly widespread application of big data, it also brings many information security risks. Therefore, the demand for safe and efficient information encryption technology is very urgent in today's society. Traditional encryption technology mainly relies on electronic means such as computers or digital signal processors, but these methods still have limitations in speed, cost and universality in the current commodity society. Since the 21st century, domestic and foreign researchers have found that optical information has multiple properties such as amplitude, phase, wavelength, polarization, lifetime, etc., and high speed, high storage and high parallelism, breaking through the limitations of traditional electronic encryption technology. Therefore, optical or optoelectronic information encryption technology has become a new emerging technology field, and at the same time is one of the important research contents of modern encryption technology. Researching new optical and optoelectronic information encryption technology is a frontier topic in the field of information and optical functional materials. As encryption in the construction of future smart cities, the development of new encryption materials and the research of system optical or optoelectronic information processing technology will have wide application prospects in national security, national life and national economy and other fields. Changes in optical properties caused by changes in molecular polarity, molecular structure or aggregation state under external stimuli (such as light, external force, temperature, electric field and pH value, etc.) also have the potential to be introduced into optical encryption systems, not only increasing the degree of encryption and improving the safety factor, but also increasing the information diversification to some extent.

[0003] The prior art discloses a photothermal dual logic gate controlled triphenylethylene photochromic material and its synthesis method and application. The tetraphenylbenzene derivative is introduced into the triphenylethylene structure, and the tetraphenylbenzene is composed of four phenyl substituent centers on the benzene ring. The benzene ring in the group can rotate freely, so that the tetraphenylbenzene can form multiple conformations by changing the temperature, thereby shaping a new triaryl ethylene photochromic material with photothermal dual logic gate control. The material for logic gate encryption disclosed in the prior art needs to be controlled by light and heat, and needs to rely on stimuli response other than light, which increases the complexity of the logic gate and to some extent limits the advantage of fast optical information transmission. SUMMARY

[0004] The present application aims at overcoming the defects and shortcomings of the prior art that the materials applied to the photoelectric information encryption technology need to respond to stimuli other than light, increase the complexity of logical gates and limit the advantage of fast optical information transmission to some extent, and providing a photochromic encryption system that can realize optical encryption only through light stimulation.

[0005] A further object of the present application is to provide an application of the photochromic encryption system in information encryption.

[0006] A further object of the present application is to provide an application of the photochromic encryption system in optical logical gate encryption.

[0007] The above objects of the present application are achieved by the following technical solutions.

[0008] A photochromic encryption system, comprising a carrier and an encryption information layer arranged on the carrier, wherein the encryption information layer is formed by a combination of coating areas of four different encryption inks,

[0009] The four different encryption inks are respectively: a mixture of DASA-1 and a polyurethane solution; a mixture of DASA-2 and a polyurethane solution; a mixture of DASA-3 and a polyurethane solution; and a mixture of DASA-2 and polystyrene.

[0010] The structural formula of DASA-1 is shown as formula I, the structural formula of DASA-2 is shown as formula II, and the structural formula of DASA-3 is shown as formula III.

[0011]

[0012] It should be noted that the photochromic encryption system of the present application is a full-optical writing and naked-eye readable logical gate encryption photochromic system, which can be applied to information encryption and anti-counterfeiting. The encryption ink of the photochromic encryption system of the present application is simple to synthesize, recyclable, low in cost, and green and pollution-free.

[0013] The four different encryption inks can present different colors, including DASA-2@PS presenting a deep purple color, DASA-2@TPU presenting a light purple color, DASA-1@TPU presenting a red color, and DASA-3@TPU presenting a green color.

[0014] PS is polystyrene, and TPU is polyurethane.

[0015] The four different encryption inks in the photochromic encryption system of the present application have different changes in absorbance under 550nm and 635nm light irradiation over time. The encryption information layer of the present application is formed by the combination of the coating areas of the four different encryption inks. The writing of the encryption information on the carrier can be realized by coating different inks. The encryption information can be reproduced by giving certain external stimulation, i.e. 550nm and 635nm light irradiation in a certain time and order, so as to realize decryption or anti-counterfeiting.

[0016] The encryption information formed by the combination of the coating areas of the four different encryption inks in the encryption information layer can be set as any information carrier, including patterns, characters, numbers, etc.

[0017] The photochromic encryption system of the present application only needs external light stimulation to realize logic gate control, without the need for other signal carriers such as electrons or other charged particles to transmit information. Compared with the existing logic gate elements designed based on electronic principles, the present application has a faster transmission speed and is easier to implement, which is more conducive to the application of logic gates.

[0018] In the specific embodiment, preferably, the four different encryption inks of the present application are prepared by the following method:

[0019] The polystyrene or polyurethane is dissolved in a solvent to obtain a stable solution, and the DASA-1, DASA-2 or DASA-3 is uniformly mixed with the polystyrene or polyurethane polymer solution to obtain the encryption ink.

[0020] In the specific embodiment, in order to obtain a stable solution, the polystyrene or polyurethane is dissolved in a solvent and stirred at 60℃ to obtain a stable polystyrene or polyurethane polymer solution.

[0021] In the specific embodiment, in order to further optimize the suitable color development concentration and optimize the encryption fading effect, preferably, the mass concentration of the polystyrene or polyurethane in the stable solution is 0.03-0.2g / mL, for example, it can be 0.03g / mL, 0.05g / mL, 0.08g / mL, 0.12g / mL, 0.15g / mL, 0.18g / mL, 0.2g / mL, etc.

[0022] In the specific embodiment, preferably, the mixing ratio of the DASA-1, DASA-2 or DASA-3 to the polystyrene or polyurethane polymer solution is 5mg:2-30mL, for example, 5mg:2mL, 5mg:5mL, 5mg:8mL, 5mg:10mL, 5mg:15mL, 5mg:20mL, 5mg:25mL, 5mg:30mL, etc.

[0023] The application also specifically protects the application of the photochromic encryption system in information encryption.

[0024] In a specific application, preferably, the encryption information layer of the photochromic encryption system is identified by first irradiating at 550 nm wavelength for 6 seconds and then irradiating at 550 nm wavelength for 40 seconds.

[0025] In a specific application, preferably, the encryption information layer of the photochromic encryption system can also be identified by first irradiating at 550 nm wavelength for 6 seconds and then irradiating at 635 nm wavelength for 8 seconds.

[0026] In a specific embodiment, preferably, tetrahydrofuran is used as the encryption reagent in the application.

[0027] The application also specifically protects the application of the photochromic encryption system in optical logic gate encryption.

[0028] In a specific application, the external stimulus input condition of the optical logic gate encryption is set as: input 1 represents irradiation at 550 nm wavelength for 6 seconds, input 2 represents irradiation at 550 nm wavelength for 40 seconds, and input 3 represents irradiation at 635 nm wavelength for 8 seconds, and only when input 1 is first input and then input 2 or 3 can the decryption be performed.

[0029] The photochromic encryption system of the application can be applied to a logic encryption scheme in which an AND gate and an XOR gate are connected in series.

[0030] Compared with the prior art, the application has the following beneficial effects:

[0031] The photochromic encryption system of the application is a full-optical writing and naked-eye readable logic gate encryption photochromic system. The encryption information layer is formed by the combination of the coating areas of four different encryption inks. The writing of the encryption information on the carrier can be realized by coating different inks. The encryption information layer can present different color changes by being given certain external stimuli, i.e., 550 nm and 635 nm light irradiation for a certain time and in a certain order, so as to finally reproduce the encryption information and realize decryption or anti-counterfeiting.

[0032] The photochromic encryption system of the application can realize logic gate control only by external light stimulation, without the need for information transmission by other signal carriers such as electrons or other charged particles. Compared with the prior art, the application is faster in information transmission speed and easier to implement, and is more conducive to the application of logic gates. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The color display of the four different encryption inks.

[0034] Figure 2The absorbance at 560 nm of DASA-1@polyurethane composite under 550 nm light illumination as a function of time.

[0035] Figure 3 The absorbance at 576 nm of DASA-2@polyurethane composite under 550 nm light illumination as a function of time.

[0036] Figure 4 The absorbance at 635 nm of DASA-3@polyurethane composite under 635 nm light illumination as a function of time.

[0037] Figure 5 The schematic diagram of the construction principle of the optical logic gate encryption system.

[0038] Figure 6 The decryption route 1 of the optical logic gate encryption system.

[0039] Figure 7 The decryption route 2 of the optical logic gate encryption system. DETAILED DESCRIPTION

[0040] The present application will be further described in conjunction with specific embodiments, but the embodiments do not limit the present application in any form. Unless otherwise specified, the raw materials used in the embodiments of the present application are commercially available raw materials.

[0041] Example 1

[0042] An optical logic gate for logic encryption of "and" gate and "XOR" gate in series, as shown in Figure 5 , is as follows:

[0043] On a four-by-four digital array, the true information "201507" is hidden in other digital characters, which are written on a polytetrafluoroethylene mold with four different encryption inks, which are prepared from four kinds of DASA-1 or DASA-2 or DASA-3 polystyrene or polyurethane composite materials, including DASA-2@PS (deep purple), DASA-2TPU (light purple), DASA-1@TPU (red), and DASA-3@TPU (green), as shown in Figure 1 .

[0044] According to the encryption path as shown in Figure 6 , only input 1 (illumination at 550 nm wavelength for 6 seconds) and input 2 (illumination at 550 nm wavelength for 40 seconds) are performed, as shown in Figure 6To obtain the real output "201507", otherwise, the error information "200115007" or "257" will be displayed. Therefore, the only way to decrypt this encryption device is to perform the correct input according to the correct path, and the use of the wrong input path will eventually produce a deceptive output, which guarantees the security and concealment of the optical information.

[0045] DASA-1, DASA-2, and DASA-3 are obtained by reacting an aromatic donor and an acceptor (McLulian acid furfuraldehyde derivative or carbonic acid furfuraldehyde derivative containing electron-withdrawing group), which can be prepared according to the prior art CN 117327045A.

[0046] The preparation of the encryption ink of the optical logic gate encryption system is as follows:

[0047] The DASA-1, DASA-2, and DASA-3 dyes are mixed with polystyrene or polyurethane solution to prepare the photochromic encryption ink for optical logic gate encryption.

[0048] 5g of polystyrene or polyurethane is dissolved in 100mL of tetrahydrofuran, and the obtained mixture is stirred at 60°C to obtain a stable polystyrene or polyurethane polymer solution. Subsequently, 5mg of DASA-1 or DASA-2 or DASA-3 powdered photochromic agent is mixed with 10mL of polystyrene or polyurethane polymer solution, and the obtained mixed solution is pipetted and repeatedly extruded with a pipette to ensure complete dissolution of the dye powder,

[0049] The prepared mixed solution is used for the construction of the photochromic encryption system of the next step of optical logic gate encryption, and the obtained DASA-1 or DASA-2 or DASA-3 and polystyrene or polyurethane composite material are marked as DASA-1@TPU, DASA-2@TPU, DASA-3@TPU, DASA-2@PS.

[0050] wherein,

[0051] The absorbance of DASA-1@polyurethane composite at 560nm under 550nm light changes with time as shown in the following figure: Figure 2 .

[0052] The absorbance of DASA-2@polyurethane composite at 576nm under 550nm light changes with time as shown in the following figure: Figure 3 .

[0053] The absorbance of DASA-3@polyurethane composite at 635nm under 635nm light changes with time as shown in the following figure: Figure 4 .

[0054] Specific decryption method and route of logic gate

[0055] Optical logic gate encryption information write

[0056] DASA-1 / DASA-2 / DASA-3@PS / TPU composite material is coated on a polytetrafluoroethylene mold designed in a four-by-four digital array using a pipette, and a certain coating rule is followed, such as Figure 6 Encryption system, so that the defined real information "201507" is hidden in other digital characters, and the mold is placed in the dark, and the polymer film is formed after the solvent is volatilized.

[0057] Optical logic gate encryption information output

[0058] According to the encryption path, input 1 (irradiating the polytetrafluoroethylene mold for 6 seconds at a wavelength of 550 nm) and input 2 (irradiating the polytetrafluoroethylene mold for 40 seconds at a wavelength of 550 nm) are performed to obtain the real output "201507", and the real output "201507" is also obtained. Otherwise, the error information "200115007" or "257" will be displayed. Thus, the optical logic gate encryption is realized.

[0059] Example 2

[0060] A logic encryption optical logic gate in which an "and" gate and an "exclusive or" gate are connected in series, as shown in Figure 4 , is as follows:

[0061] On a four-by-four digital array, the real information "201507" is hidden in other digital characters, and these characters are written on a piece of polytetrafluoroethylene mold, which has four different encryption inks made of four DASA-1 or DASA-2 or DASA-3 polystyrene or polyurethane composite materials, including DASA-2@PS (deep purple), DASA-2 TPU (light purple), DASA-1@TPU (red), and DASA-3@TPU (green), as shown in Figure 1 .

[0062] According to the encryption path as shown in Figure 7 , only input 1 (irradiation for 6 seconds at a wavelength of 550 nm) and input 3 (irradiation for 8 seconds at a wavelength of 635 nm) are performed, as shown in Figure 7 , to obtain the real output "201507", otherwise the error information "200115007" or "257" will be displayed. Therefore, the only way to decrypt this encryption device is to perform the correct input according to the correct path, and using the wrong input path will eventually produce a deceptive output, which ensures the security and concealment of the optical information.

[0063] The preparation of the encryption ink of the optical logic gate encryption system is as follows:

[0064] DASA-1, DASA-2, DASA-3 dyes mixed with polystyrene or polyurethane solution to prepare photochromic encryption ink for optical logic gate encryption.

[0065] 5g polystyrene or polyurethane was dissolved in 100mL tetrahydrofuran, and the obtained mixture was stirred at 60°C to obtain a stable polystyrene or polyurethane polymer solution. Subsequently, 5mg DASA-1 or DASA-2 or DASA-3 powder photochromic agent was mixed with 10mL polystyrene or polyurethane polymer solution, and the obtained mixed solution was pipetted and repeatedly extruded with the pipette to ensure complete dissolution of the dye powder,

[0066] The prepared mixed solution was used to construct the next step of the photochromic encryption system of the optical logic gate, and the obtained DASA-1 or DASA-2 or DASA-3 and polystyrene or polyurethane composite material was marked as DASA-1@TPU, DASA-2@TPU, DASA-3@TPU, DASA-2@PS.

[0067] Specific decryption method and route of logic gate

[0068] Optical logic gate encryption information writing

[0069] DASA-1 / DASA-2 / DASA-3@PS / TPU composite material was coated on a polytetrafluoroethylene mold designed with a four-by-four digital array using a pipette, and a certain coating rule was followed, such as Figure 6 Encryption system, so that the defined real information "201507" is hidden in other digital characters, and the mold is placed in the dark, and the solvent is volatilized to form a polymer film.

[0070] Optical logic gate encryption information output

[0071] According to the encryption path, input 1 (irradiating the polytetrafluoroethylene mold at a wavelength of 550nm for 6 seconds) and input 3 (irradiating the polytetrafluoroethylene mold at a wavelength of 635nm for 8 seconds) were performed, and the real output "201507" was also obtained. Otherwise, the error information "200115007" or "257" will be displayed. Thus, the optical logic gate encryption is realized.

[0072] Example 3

[0073] A logic encryption optical logic gate in which an "and" gate and an "exclusive or" gate are connected in series, such as Figure 5 , is as follows:

[0074] On a 4x4 array of numbers, the true information "201507" is hidden among other numeric characters written on a polytetrafluoroethylene (PTFE) mold. The mold contains four different encryption inks made from four different polystyrene or polyurethane composites of DASA-1, DASA-2, or DASA-3: DASA-2@PS (dark purple), DASA-2TPU (light purple), DASA-1@TPU (red), and DASA-3@TPU (green). Figure 1 .

[0075] According to the encryption path, Figure 6 Only when input 1 (irradiation at 550 nm wavelength for 6 seconds) and input 2 (irradiation at 550 nm wavelength for 40 seconds) were executed, such as Figure 6 Only by following the correct input path can the true output "201507" be obtained; otherwise, error messages "200115007" or "257" will be displayed. Therefore, the only way to decrypt this encryption device is to execute the correct input path. Using the wrong input path will eventually produce a deceptive output, which ensures the security and concealment of optical information.

[0076] Among them, DASA-1, DASA-2, and DASA-3 are obtained by reacting aromatic donors and acceptors (McClellan acid furanaldehyde derivatives or carbonic furanaldehyde derivatives containing electron-withdrawing groups), and can be prepared with reference to the existing technology CN 117327045A.

[0077] The preparation of the encryption ink for the optical logic gate encryption system is as follows:

[0078] DASA-1, DASA-2, and DASA-3 dyes are mixed with polystyrene or polyurethane solutions to prepare photochromic encryption inks for optical logic gate encryption.

[0079] 10 g of polystyrene or polyurethane was dissolved in 100 mL of tetrahydrofuran, and the resulting mixture was stirred at 60 °C to obtain a stable polystyrene or polyurethane polymer solution. Subsequently, 5 mg of DASA-1, DASA-2, or DASA-3 powdered photochromic agent was mixed with 30 mL of the polystyrene or polyurethane polymer solution, and the resulting mixture was transferred using a pipette and repeatedly extruded using the pipette to ensure complete dissolution of the dye powder.

[0080] The prepared mixed solution is used for the construction of the photochromic encryption system for the next step of optical logic gate encryption. The resulting DASA-1 or DASA-2 or DASA-3 composite materials with polystyrene or polyurethane are labeled as DASA-1@TPU, DASA-2@TPU, DASA-3@TPU, and DASA-2@PS.

[0081] Specific decryption method and route of logic gate

[0082] Optical logic gate encrypted information writing

[0083] DASA-1 / DASA-2 / DASA-3@PS / TPU composite material is coated on a polytetrafluoroethylene mold designed in a four-by-four digital array using a pipette, and a certain coating rule such as Figure 6 The encryption system makes the defined real information "201507" hidden in other digital characters, and the mold is placed in the dark, and the polymer film is formed after the solvent volatilizes.

[0084] Optical logic gate encrypted information output

[0085] According to the encryption path, input 1 (irradiating the polytetrafluoroethylene mold for 6 seconds at a wavelength of 550 nm) and input 2 (irradiating the polytetrafluoroethylene mold for 40 seconds at a wavelength of 550 nm) are performed to obtain the real output "201507", and the same real output "201507" is obtained. Otherwise, an error message "200115007" or "257" will be displayed. Thus, optical logic gate encryption is achieved.

[0086] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. All embodiments do not need to be exhausted here. Any modification, equivalent replacement and improvement within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An application of a photochromic encryption system in optical logic gate encryption, characterized in that, The photochromic encryption system includes a carrier and an encryption information layer disposed on the carrier. The encryption information layer is formed by a combination of coating areas of four different encryption inks. The four different encryption inks are: a mixture of DASA-1 and polyurethane solution; a mixture of DASA-2 and polyurethane solution; a mixture of DASA-3 and polyurethane solution; and a mixture of DASA-2 and polystyrene solution. The structural formula of DASA-1 is shown in Formula I; the structural formula of DASA-2 is shown in Formula II; and the structural formula of DASA-3 is shown in Formula III. Formula I Formula II Formula III; The encryption information layer of the photochromic encryption system is identified by first irradiating it at a wavelength of 550nm for 6 seconds and then at a wavelength of 550nm for 40 seconds, or by first irradiating it at a wavelength of 550nm for 6 seconds and then at a wavelength of 635nm for 8 seconds. The external stimulus input conditions for the optical logic gate encryption are set as follows: input 1 represents irradiation at a wavelength of 550nm for 6 seconds, input 2 represents irradiation at a wavelength of 550nm for 40 seconds, and input 3 represents irradiation at a wavelength of 635nm for 8 seconds. Decryption is only possible when input 1 first, followed by input 2 or 3.

2. The application as described in claim 1, characterized in that, The four different encryption inks are prepared by the following method: The encryption ink can be prepared by dissolving polystyrene or polyurethane in a solvent to obtain a stable polystyrene solution or polyurethane solution, and then mixing DASA-1, DASA-2 or DASA-3 with the polystyrene solution or polyurethane solution evenly.

3. The application as described in claim 2, characterized in that, The polystyrene solution has a polystyrene concentration of 0.03~0.2 g / mL; the polyurethane solution has a polyurethane concentration of 0.03~0.2 g / mL.

4. The application as described in claim 2, characterized in that, The mixing ratio of DASA-1, DASA-2, or DASA-3 with polystyrene solution or polyurethane solution is 5 mg: 2~30 mL.

5. The application as described in claim 2, characterized in that, The solvent is tetrahydrofuran.

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