Method and apparatus for an anti-counterfeiting system using color space dependent raman spectroscopy of diamond

Abstract

A method and system for encrypting and decrypting authentication information about a synthetic Raman diamond tag having predetermined defects, impurities and / or strains formed in its crystal structure. A sender establishes the authentication identity of a synthetic diamond Raman tag and the nature of the sender by Raman scanning using a spectrometer. The sender then encrypts information about the synthetic Raman diamond tag and the sender and physically transmits the Raman tag to a recipient and electronically transmits the encrypted information to the recipient. The recipient first authenticates the diamond Raman tag and then authenticates the nature of the sender. Only upon successful first and second authentication steps, the recipient decrypts the encrypted information by reverse Raman scanning.

Description

Technical Field

[0001] This invention relates to anti-counterfeiting, and more specifically, to the use of color space-correlated Raman spectroscopy of diamond to detect counterfeit goods. Background Technology

[0002] Optical security features such as fluorescent markers on banknotes, glitter stickers on packaging, and watermarks are ubiquitous. However, they are fragile and easily copied. For example, fluorescent markers are made of photobleached ink / dye, while glitter stickers are typically made of reproducible photonic structures. Therefore, physically unclonable optical security features are needed.

[0003] Raman spectroscopy is a widely used technique in Raman scattering spectroscopy for materials analysis because Raman scattering is an inelastic scattering phenomenon of light that detects molecular vibrations. Three main characteristics include (1) Raman shift position.

[0004]

[0005] (2) Raman intensity and (3) the linewidth (full-width at half maximum, FWHM) of the Raman peaks can be obtained from Raman spectroscopy to obtain information about the chemical structure, chemical quantities, and internal strain of the material, respectively. However, Raman spectroscopy is usually only used for analyzing the target material of interest (“first person”) and is not often used for “second / third person” anti-counterfeiting.

[0006] The Raman spectroscopy of synthetic diamond offers an ideal solution to the problem of providing physically unclonable optical anti-counterfeiting devices. Synthetic diamond is a man-made diamond that is also difficult or nearly impossible to remove / damage by chemical or physical methods. 3 The local environment of carbon atoms, revealed by scattering of inelastic light matter. Raman features are physically unclonable because defects / impurities / strain in synthetic diamonds are randomly distributed, either naturally occurring in this manner or artificially designed into the crystal structure of diamond during growth. See, J. Appl. Phys. 127, 035302 (2020); https: / / doi.org / 10.1063 / 1.5123263.

[0007] Producing synthetic diamonds requires expensive and complex micro / nano fabrication techniques to create Raman peak features, including vacuum deposition, annealing, reactive ion etching, ultraviolet lithography, focused ion implantation, and the use of toxic gases. Adv. Funct. Mater., 2102108 (2021); https: / / doi.org / 10.1002 / adfm.202102108.

[0008] Existing methods for creating characteristic Raman peaks require embedding microdiamonds in a biopolymer solution, spatially distributing the mixture into a thin film, and Raman imaging techniques. Summary of the Invention

[0009] By rationally controlling the growth of diamonds with defects, impurities, and strain, unclonable synthetic diamonds have been synthesized. Furthermore, the expensive diamond growth machinery required to manufacture synthetic diamonds hinders the availability of potential replicas on the market. Therefore, the Raman characteristics of synthetic diamonds represent the best solution for physically unclonable optical anti-counterfeiting.

[0010] Compared to existing technologies, this invention is cost-effective and relatively safe in its manufacturing process, as it only requires vacuum deposition. In particular, this invention does not require additional chemical synthesis after diamond formation. Furthermore, this invention performs well in point measurements and eliminates the need to develop expensive, advanced Raman imaging devices for observation.

[0011] According to the present invention, a color space-correlated Raman system has been developed, which combines 1) a synthetic diamond Raman tag as a physically unclonable optical anti-counterfeiting measure and 2) a joint Raman spectrometer and Raman camera as an easy-to-use encoding and decoding system. These encoding / decoding systems constitute a novel and cost-effective optical anti-counterfeiting system. The system performs multi-level optical encryption (OE) and optical decryption (OD). OE is the process of encrypting information about the excitation laser power, excitation laser wavelength, and defects / impurities / strains (different types, concentrations, etc.) with different random distributions into Raman characteristics: Raman intensity, Raman shift, Raman shift variation, and full width at half maximum (FWHM). OD is a continuous Raman measurement for first-stage identification using a Raman spectrometer or Raman spectrometer sensor, and second-stage identification using an RGB detector (a color scientific camera, color camera, or black-and-white camera coupled with a set of custom color filters).

[0012] This invention utilizes non-clonable synthetic diamond Raman tags for robust anti-counterfeiting labels and multi-level optical decryption for cross-authentication. These advantages facilitate the application of this invention as an anti-counterfeiting device in luxury goods, electronic components, vehicles, and packaging.

[0013] The problems to be overcome in implementing this invention include: 1) the required spatially resolved Raman imaging equipment, 2) the complexity and cost of the equipment, and 3) the limited robustness of commonly used optical anti-counterfeiting tags. However, current synthetic diamond Raman tags are not cloneable, unlike typical Raman tags which are made from easily replicable known chemicals. Furthermore, synthetic diamond is not a common material, which minimizes the chance of it being copied. Simultaneously, synthetic diamond itself possesses unclonable physical characteristics because it is grown from a single diamond seed, each of which can have different crystal orientations and internal crystal structure strains. Therefore, the Raman spectra of grown diamonds from the same batch or different batches may differ, making it impossible to accurately replicate known synthetic diamond Raman tags.

[0014] The Raman apparatus of this invention is a Raman camera and spectrometer based on "zero-dimensional point" measurement. During the measurement process, a laser is focused onto a small "point" on diamond to detect Raman scattering. The length, width, and depth of this point are approximately several hundred nanometers. Therefore, unlike conventional Raman microscopes that perform two-dimensional or three-dimensional spatial imaging, this point can be considered a zero-dimensional point. Since current Raman apparatuses only require zero-dimensional measurement, they are much easier to operate and develop compared to existing Raman imaging techniques. As a result, this invention enables the observation of Raman signals in a simplified and cost-effective manner. Raman apparatuses typically employ low-cost, static optical and mechanical components for zero-dimensional observation. This differs from existing commercially available machines that utilize complex and expensive laser or mechanical scanning mechanisms for Raman imaging.

[0015] The synthetic diamond Raman label of this invention is made of diamond and possesses four main advantages based on its chemical and physical properties compared to commonly used prior art, making it highly robust for use in optical anti-counterfeiting labels. First, the instruments and chemicals used to grow diamond are very expensive and are owned by a few reliable manufacturers, making it very robust in manufacturing. Second, diamond is highly chemically inert, so it will not be damaged or removed by chemicals commonly used by the public. Third, its ultimate hardness, strength, and stiffness protect it from potential physical damage such as scratches, drilling, impacts, or any type of mechanical contact. Finally, diamond is optically stable and does not undergo photobleaching, therefore its Raman signal is durable. In contrast, commonly used optical anti-counterfeiting labels do not possess the same advantages. Existing optical anti-counterfeiting labels typically rely on fluorescent inks / dyes and photonic crystals, which can be obtained or replicated at a relatively low cost compared to the synthetic diamond Raman label of this invention. Furthermore, fluorescent inks / dyes are photobleaching and can therefore be removed by strong or prolonged exposure to light.

[0016] In an exemplary embodiment, in step 1, the sender establishes the authentication identity of the synthetic diamond Raman tag and RGB codes representing the sender's properties. To define the authentication identity of the synthetic diamond Raman tag, the sender measures the Raman spectrum of the synthetic diamond Raman tag using a system. The synthetic diamond Raman tag converts a sender-defined laser wavelength and a sender-defined laser power into predefined Raman shifts, predefined Raman intensities, and predefined FWHMs of the diamond's Raman characteristics through Raman scattering. To define the sender's properties, the sender remeasures the Raman spectrum of the Raman tag, but uses a set of arbitrarily selected RGB filters to represent the sender. These RGB codes are shared between the sender and the receiver.

[0017] During operation, the laser beam is reflected from a dichroic mirror and focused onto CVD or HPHT synthetic diamond via an objective lens. The backscattered Raman light is collected by the same objective lens and passes through the same dichroic mirror to the laser filter; therefore, the detector only collects the backscattered Raman light. After leaving the laser filter, the backscattered light encounters arbitrarily chosen RGB filters, which represent a custom set of red (R), blue (B), and green (G) filters. RGB filters are used when measuring color space-dependent Raman spectra.

[0018] The encryption and decryption operations involve the following steps:

[0019] Step 1. The sender establishes the authentication identity and sender nature of the synthetic diamond Raman tag.

[0020] Step 2. Encrypt the message sent by the sender.

[0021] Step 3. The sender transmits the Raman tag, encrypted information, and authenticated identity to the receiver.

[0022] Step 4. Recipient authentication of the sender's nature and diamond Raman tag.

[0023] Step 5. The receiver decrypts the message.

[0024] The result is a two-step authentication for optical anti-counterfeiting devices that are difficult to clone (diamond Raman label and RGB filter definition). Attached Figure Description

[0025] The patent or application document contains at least one color drawing.

[0026] The foregoing and other objects and advantages of the invention will become more apparent when considered in conjunction with the following detailed description and accompanying drawings, wherein like reference numerals denote like elements in the various views, and

[0027] in:

[0028] Figure 1 This is a diagram of the Raman dispersive spectrometer in the fiber optic detection configuration;

[0029] Figure 2 This is a diagram of the Raman dispersive spectrometer in an open-space detection configuration;

[0030] Figure 3 These are Raman spectra of CVD-synthesized diamond measured using different excitation lasers;

[0031] Figure 4 It is a transmission spectrum of an arbitrarily selected set of RGB filters.

[0032] Figure 5 This is a graph showing the red (R), blue (B), and green (G) components of the color space-correlated Raman spectrum of CVD-synthesized diamond measured using the apparatus of this invention with blue (457 nm) as the excitation light.

[0033] Figure 6A It is a diagram of a sender-defined synthetic diamond Raman tag with an arbitrarily selected RGB filter. Figure 6B It is a diagram with a fake Raman label that pretends to originate from a fake RGB filter / instrument;

[0034] Figure 7 It is the setup for the sender to establish identity authentication using synthetic diamond Raman tags;

[0035] Figure 8 Establish a sender authentication mechanism for the sender;

[0036] Figure 9 It is used to establish the arrangement of encrypted information to be sent by the sender;

[0037] Figure 10 It is a diagram showing the transmission of Raman tags, encrypted information, and authentication identity from the sender to the receiver.

[0038] Figure 11 Establish an authentication arrangement for the recipient using synthetic diamond Raman tags;

[0039] Figure 12 It is the arrangement for the receiver to establish sender authentication; and

[0040] Figure 13 It is the arrangement for the receiver to send decrypted information. Detailed Implementation

[0041] This invention is an anti-counterfeiting system based on color space correlated Raman spectroscopy. Color space correlated Raman spectroscopy comprises materials, instruments, and operating methods. The material is a Raman tag, which is a substance that exhibits Raman scattering.

[0042] Raman tags are any type of synthetic diamond that carries physically unclonable, randomly distributed defects / impurities / strain, which are generated during its growth either naturally or artificially designed within the crystal structure. For example, the material can be synthetic diamond produced using chemical vapor deposition (CVD) or high-pressure, high-temperature (HPHT) processes.

[0043] The instrument is a combined Raman spectrometer and Raman camera, which are easy-to-use systems. The spectrometer is used to spatially separate the light, while the camera is used to record the intensity of the spatially separated light. Raman spectroscopy provides four main pieces of information: (1) Raman shift (peak position), which indicates the specific molecular vibrational modes and molecular bonding; (2) changes in Raman shift (peak shift), which indicate the internal strain of the chemical structure; (3) FWHM (peak width, Raman signal color diffusion), which indicates the crystallinity of the chemical structure; and (4) Raman intensity (peak height), which indicates the specific molecular vibrational modes and the amount of molecular bonding.

[0044] However, during the measurement, the Raman scattered light is spatially mixed with the backscattered excited laser. See also Figure 1 Backscattering of the laser light creates a strong background for Raman scattering, and the mixed signal hinders the recording of specific Raman signals. To record specific Raman scattering signals, spectrometers are used to spatially separate the light into specific intervals based on its color, much like a rainbow or the rainbow created by CDs, VCDs, and DVDs.

[0045] After spatial separation, the camera records light intensity through its spatially distributed sensor pixels. Each pixel of the camera sensor represents a single wavelength (color) of light separated relative to the spectrometer. The same principle applies to:

[0046] Case Study 1: Traditional Scientific Spectrometers and Scientific Cameras

[0047] Case Study 2: Spectrometer Sensor

[0048] Case 3: Raman Camera

[0049] Red, green, and blue filters convert the recorded Raman signal into R, G, and B components, similar to the RGB values ​​provided by a traditional RGB color camera. The color filters have their own transmission properties within the red, green, and blue color ranges. Through the specific transmission capabilities of the RGB filters, the color filters adjust the Raman signal intensity into three components. The camera does not produce an image; it only records the light intensity.

[0050] This invention features a two-stage identification process. A Raman spectrometer is responsible for the first stage of identification, using Raman spectroscopy to study the Raman intensity, Raman shift, and full width at half maximum (FWHM) of the Raman tags. The Raman spectrometer can be a conventional scientific camera coupled to a spectrometer or a stand-alone spectrometer sensor. It can be used in applications such as... Figure 1 The fiber optic detection configuration shown or Figure 2 The instrument operates in the open space detection configuration shown. It can also operate in either reflective or transmissive configurations.

[0051] The Raman camera is responsible for the second-stage identification using color filters to truncate the Raman spectrum, used for color space-related Raman signature authentication. The Raman camera can be a color scientific camera, a color camera, or a monochrome camera coupled with a set of custom color filters.

[0052] During operation, the beam 11 from laser 10 is reflected by dichroic mirror 12 and focused by objective lens 14 onto CVD or HPHT synthetic diamond 16. Backscattered Raman light 13 is collected by the same objective lens 14 and passes through the same dichroic mirror 12. In effect, the dichroic mirror reflects the laser onto the CVD or HPHT diamond while simultaneously transmitting the Raman backscattered light. This backscattered laser 13 is filtered by laser filter 18, so the detector can only collect the backscattered Raman light.

[0053] Objective 14 can be a reflective or refractive objective. The objective can also be a simple transmission lens. The laser beam can have any wavelength capable of inducing detectable Raman scattering for the system. For example, the Raman spectrum of CVD-synthesized diamond is measured using the apparatus of this invention with violet (360 nm), blue (457 nm), greenish-blue (488 nm), green (514 nm), or red (633 nm) laser light as excitation. Figure 3 As shown. In fact, Figure 3 The Raman spectra of CVD-synthesized diamonds measured using excitation lasers of different colors are shown.

[0054] After exiting the laser filter 18, the backscattered light 13 encounters the RGB filter 15, which represents a custom set of red (R), blue (B), and green (G) filters. The RGB filter 15 is used when measuring color space-correlated Raman spectra. The RGB filters are arbitrarily chosen. An example of the transmission spectrum of an arbitrarily chosen set of RGB filters is shown in Figure 4.

[0055] In one embodiment, the color space-correlated Raman spectrum of CVD or HPHT synthetic diamond measured by the apparatus of the present invention can use blue light (457 nm) as the excitation light, which is decomposed into red (R), blue (B), and green (G) components, such as... Figure 5 As shown, Figure 5 The color space-correlated Raman spectra of CVD or HPHT synthetic diamonds measured using the apparatus of this invention are shown. The collected color space-correlated Raman spectra of CVD or HPHT synthetic diamonds were ultimately converted into a color space representation by a computer program. See also... Figure 6B The color space can be represented as RGB, HSL, or any custom format.

[0056] like Figure 1 In the configuration shown, the backscattered beam is picked up by an optical fiber coupler and optical fiber 17. The optical fiber guides the backscattered light to spectrometer and camera assemblies 20 and 22 (optical fiber detection configuration). Figure 2 In this configuration, backscattered light enters directly into the spectrometer and camera assembly 20, 22, without using optical fiber (i.e., open-space detection). The spectrometer 20 provides the spectrum of the received light by dividing it into different positions based on color. The camera records spectral parameters, which are used in the authentication process.

[0057] A simple and easy-to-use multi-level anti-counterfeiting system based on Raman spectroscopy employs synthetic diamond in the first level of protection and arbitrary RGB color filters in the second level. The synthetic diamond Raman tag simultaneously acts as both the encryption and decryption key. This synthetic diamond key possesses specific inherent Raman properties generated by controlling growth parameters, such as the purity of the starting carbon material, impurity type, impurity quantity, impurity location, growth rate, temperature, and pressure. Therefore, unique, non-cloneable synthetic diamond Raman tags can be manufactured by adjusting these parameters.

[0058] Arbitrarily selected RGB color filters act as the user's authentication key. These filters are predefined by the user between the sender and receiver. They encrypt the synthetic diamond Raman tag into a sender identification code, enabling the receiver to verify the source of the information. In short, the encryption and decryption process of this invention can be divided into 5 steps:

[0059] Step 1. The sender establishes the authentication identity of the synthetic diamond Raman tag and the RGB code representing the sender's nature.

[0060] Step 2. The sender encrypts the message to be sent.

[0061] Step 3. The sender transmits the Raman tag, encrypted information, and authenticated identity to the recipient.

[0062] Step 4. Recipient authentication of the sender's nature and diamond Raman tag.

[0063] Step 5. The receiver decrypts the message.

[0064] In step 1, the sender establishes the authentication identity of the synthetic diamond Raman tag and RGB codes representing the sender's properties. To define the authentication identity of the synthetic diamond Raman tag, the sender measures the Raman spectrum of the tag using a system. The synthetic diamond Raman tag converts the sender's predefined laser wavelength and power into predefined Raman shifts, predefined Raman intensities, and predefined FWHMs of the diamond's Raman characteristics through Raman scattering. The obtained Raman information is considered an internal standard indicating a valid synthetic diamond Raman tag. To define the sender or the sender's properties, the sender remeasures the Raman spectrum of the tag, but uses a set of arbitrarily chosen RGB filters to represent the sender. These RGB codes are shared between the sender and receiver. These filters truncate the valid Raman spectrum into a color space representation unique to both the sender and receiver. Therefore, this helps the receiver verify the sender's properties before initiating decryption.

[0065] In step 2, the sender encrypts the information (laser wavelength and laser power) to be transmitted by measuring the Raman spectrum of the synthetic diamond Raman tag using the system. This information is then converted into Raman characteristics, including Raman intensity, Raman shift, Raman shift variation, Raman intensity, and FWHM.

[0066] In step 3, the synthetic diamond Raman tag and the encrypted information are transmitted from the sender to the receiver. The synthetic diamond Raman tag is physically transferred from the sender to the receiver, while the sender-defined laser wavelength, laser power, internal standard, the nature of the encrypted sender, and the encrypted information are transmitted electronically. The transmitted information has different levels of visibility. The sender-defined laser wavelength and laser power are immediately visible to the receiver decrypting step 4a, while the internal standard and its color space representation from step 1 are hidden. They are not revealed until the answers required for decryption in steps 4a and 4b are provided, respectively. Finally, the encrypted information is only transmitted in the final stage of decryption.

[0067] According to step 4, the synthetic diamond Raman tag and sender properties need to be authenticated in the following order: 1) Synthetic diamond Raman tag, then 2) Sender properties. To authenticate the synthetic diamond Raman tag, the receiver needs to create a Raman spectrum using the given Raman tag and the sender's predefined laser wavelength and power. If the receiver determines it has a valid Raman tag based on the created Raman spectrum, it will produce the correct answer for step 4a, allowing it to proceed to step 4b. Otherwise, the program will terminate automatically without proceeding to the next step. In the next step, the receiver needs to authenticate the sender properties. For this, the receiver needs to use the Raman spectrum in color space mode with its RGB filters. If the receiver obtains a valid color space representation, it will obtain the correct answer, thus passing step 4b. Otherwise, the program will terminate automatically without proceeding to the next step. Only when steps 4a and 4b pass in an ordered process without any incorrect answers can the receiver proceed to the final step 5.

[0068] In the final step, step 5, the receiver is in the final stage of decryption and can finally read the encrypted information. To complete decryption, the receiver needs to perform reverse Raman scattering on the received Raman tag by scanning the laser wavelength and laser power. Once the receiver obtains the correct laser wavelength and laser power (its output Raman shift, Raman intensity, and FWHM of the Raman characteristics matching the encrypted information), the receiver successfully obtains the original information.

[0069] Further explanation of the encryption and decryption process of this invention is provided below. Figure 6A and Figure 6B As shown in [the image]. Figure 6A In this process, the sender defines a synthetic diamond Raman tag and arbitrarily selects an RGB filter. The receiver receives a pseudo-Raman tag from the sender. Using the pseudo-Raman tag with the agreed-upon pseudo-RGB filter, the receiver can perform steps 4 and 5 to decrypt the tag and obtain the original information.

[0070] The laser wavelength and laser power required for the authentication method used to verify the sender's nature and valid encryption / decryption keys are as follows:

[0071] λ0,P0

[0072] The FWHM, which is the authentication feature of an effective encryption / decryption key, consisting of the encryption Raman wavelength, Raman intensity, and Raman peak, is defined by the sender and represented as follows:

[0073] λ 0Raman ,I 0Raman FWHM 0Raman

[0074] The FWHM of the encrypted Raman wavelength, Raman intensity, and Raman peak truncated by the RGB filter is used as an authentication feature of the sender nature, defined and represented by the sender.

[0075] R 0Raman G 0Raman B 0Raman

[0076] Laser wavelength and laser power are encrypted information sent by the sender, represented as...

[0077] λ,P

[0078] Encrypted information is represented as

[0079] λ Raman ,I Raman FWHM Raman

[0080] R fake Raman G fake Raman B fake Raman RGB characteristics of pseudo-RGB filters

[0081] Unlike R 0Raman G 0Raman B 0Raman

[0082] λ fake Raman ,I fake Raman FWHM fake Raman Raman features of pseudo-Raman tags

[0083] Unlike R 0Raman G 0Raman B 0Raman

[0084] For encryption and decryption operations, please refer to... Figure 7-13 Further explanation. This operation follows these steps:

[0085] Step 1. The sender establishes the authentication identity and sender nature of the synthetic diamond Raman tag.

[0086] Step 2. Encrypt the message sent by the sender.

[0087] Step 3. The sender transmits the Raman tag, encrypted information, and authenticated identity to the receiver.

[0088] Step 4. Recipient authentication of the sender's nature and diamond Raman tag.

[0089] Step 5. The receiver decrypts the message.

[0090] Figure 7The steps involved in establishing the authenticated identity of a synthetic diamond Raman tag by the sender through Raman scattering are shown. Figure 8 The steps involved in establishing the sender's authentication identity or sender properties by using an RGB filter combined with Raman scattering are shown. Figure 9 It displays the encrypted message sent by the sender.

[0091] Figure 10 This demonstrates how the sender physically transmits Raman tags and electronically transmits encrypted information to the receiver. As mentioned above, some information is hidden. In particular,

[0092] The hidden required answer for step 4a: λ 0Raman ,I 0Raman FWHM 0Raman

[0093] The hidden answer required for step 4b: R 0Raman G 0Raman B 0Raman

[0094] The prompt shown in step 5: λ Raman ,I Raman FWHM Raman

[0095] Figure 11 Step 4a (the first step of authentication) is shown, where the receiver authenticates the properties of the synthetic diamond Raman tag and the sender. If the receiver receives a genuine diamond Raman tag and performs Raman scattering on it, a correct result will be obtained, and the process proceeds to step 4b. However, if a fake diamond Raman tag is received and Raman scattered on it, an incorrect result will be obtained, and the process will terminate.

[0096] like Figure 12 As shown, the system executes step 4b (the second step of authentication). Here, the receiver obtains the RGB filter information arbitrarily chosen by the sender and uses its existing RGB filter to acquire the Raman spectrum in the color space mode. If the sender's nature is correctly determined, the process proceeds to step 5. If no correct answer is obtained, for example, because a fake RGB filter pretending to be from the real sender was sent, the process terminates.

[0097] Figure 13 This shows the execution of step 5, i.e., the receiver's decryption of the message. Figure 13 In this process, the excitation laser wavelength, scan, and power are used to induce back Raman scattering from the received Raman tag. The result is the original information and the termination of the process.

[0098] While the invention has been explained with respect to certain embodiments, it should be understood that various modifications will become apparent to those skilled in the art upon reading the specification. Therefore, it should be understood that the invention disclosed herein is intended to cover such modifications falling within the scope of the appended claims.

Claims

1. An optical anti-counterfeiting system, comprising: Synthetic Raman diamond tags with predetermined defects, impurities and / or strain are formed in their crystal structure; An arbitrary set of RGB filters, representing a sender-receiver combination shared between the sender and receiver; The sender Raman dispersive spectrometer at the sender first measures the Raman spectrum of the synthetic Raman diamond to convert the sender's predefined laser wavelength and predefined laser power into predefined Raman shift, predefined Raman intensity, and predefined FWHM of the Raman diamond's Raman characteristics through Raman scattering, thereby forming an internal standard indicating a valid synthetic Raman diamond Raman tag. Then, the Raman spectrum of the Raman tag is measured again, but the valid Raman spectrum is truncated to a color space representation that uniquely authenticates the sender's identity using the set of RGB filters. An encryption device is used to encrypt the laser wavelength and laser power predefined by the sender. A transmission device is configured to electronically transmit, from the sender to the receiver, encrypted sender-defined laser wavelength and sender-defined laser power, as well as predefined Raman shift, predefined Raman intensity, and predefined FWHM of the Raman characteristics of the Raman diamond, and the color space representation thereof; and A receiver Raman dispersive spectrometer at the receiver creates a Raman spectrum with the Raman tag, along with a laser wavelength and a laser power predefined by the sender. The receiver Raman dispersive spectrometer uses a Raman spectrum in color space mode and a shared RGB filter only when the Raman spectrum matches an internal standard. The excitation laser wavelength, scan, and power are used to apply reverse Raman scattering to the received Raman tag to decrypt the original Raman shift, Raman intensity, and FWHM encryption information of the Raman feature, and to authenticate the synthetic Raman diamond tag, only when it matches a valid color space representation.

2. The optical anti-counterfeiting system according to claim 1, wherein, The synthetic Raman diamond tags are formed by CVD or HPHT processes, thereby naturally having defects, impurities and / or strain or designing them into their crystal structure.

3. The optical anti-counterfeiting system according to claim 1, wherein, The received Raman tag is used to achieve the reverse Raman scattering through laser wavelength scanning and laser power scanning.

4. The optical anti-counterfeiting system according to claim 1, wherein, Encrypted information is sent only during the decryption phase.

5. A method for encrypting and decrypting authentication information of synthetic Raman diamond tags having predetermined defects, impurities, and / or strain formed in their crystal structure, comprising the following steps: The sender of the synthetic Raman diamond tag establishes the authentication identity of the synthetic diamond Raman tag and the nature of the sender through Raman scanning; The sender encrypts information about the synthetic Raman diamond tag and the sender; The sender physically transmits the Raman tag to the receiver and electronically transmits the encrypted information to the receiver. The receiver first authenticates the diamond Raman tag, and then authenticates the nature of the sender; as well as The receiver decrypts the encrypted information only after the first and second authentications are successful.

6. The method for encrypting and decrypting authentication information according to claim 5, wherein, The encrypted information is only sent after the first and second authentications are successful.

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