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A steganographic material and steganographic method based on surface-enhanced Raman nanoparticles

A surface-enhanced and Raman nanotechnology, applied in the fields of information security and materials, can solve the problems of poor photostability, high cost, toxicity, etc., and achieve the effects of good photostability and environmental stability, strong signal and low cost

Active Publication Date: 2022-03-11
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorescent inks, however, have their drawbacks
Traditional organic fluorescent dye inks are prone to photobleaching, have poor photostability, and the phenomenon of fluorescent cross-coloring limits the multiplexing of information combinations; while newly developed quantum dot or rare earth inks have better photostability and narrow spectral peaks. However, it may be toxic to the human body and the environment, and the cost is relatively high

Method used

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  • A steganographic material and steganographic method based on surface-enhanced Raman nanoparticles
  • A steganographic material and steganographic method based on surface-enhanced Raman nanoparticles
  • A steganographic material and steganographic method based on surface-enhanced Raman nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Steganographic ink based on embedded 1,4-BDT Raman molecule

[0037] Step 1, preparation of surface-enhanced Raman nanoparticles with gold core-shell structure (embedded 1,4-BDT Raman molecules)

[0038]Step 1.1, take 2mL of 1nmol / L seed growth method to synthesize the gold nuclei solution (25nm particle diameter, dispersed in 100mmol / L cetyltrimethylammonium chloride solution (CTAC)) centrifugal washing once, the CTAC concentration Reduced to 20mmol / L, dispersed in the original volume.

[0039] Step 1.2, slowly add 100 μL of 1,4-BDT solution into the ultrasonic tank, the solution concentration is generally greater than 2mmol / L, such as 3mmol / L, 4mmol / L, 5mmol / L, etc., let it stand for 2-4 hours for adsorption, and then centrifuge Wash several times (for example, 2 times, 3 times, 4 times), and redisperse in 1 mL of 50 mmol / L CTAC to obtain gold core particles coated with 1,4-BDT molecules.

[0040] Step 1.3, mix 20mL of 50mmol / L CTAC and 1mL of 3-7mmol / L (...

Embodiment 2

[0044] Example 2: Steganographic ink based on embedded 4-NBT Raman molecules

[0045] Step 1, preparation of surface-enhanced Raman nanoparticles with gold core-shell structure (embedded 4-NBT Raman molecules)

[0046] Step 1.1, get 2mL of 0.47nmol / L seed growth method synthetic gold nuclei solution (particle diameter 25nm, be dispersed in the cetyltrimethylammonium chloride solution (CTAC) of 100mmol / L) centrifugal washing once, CTAC The concentration is reduced to 20mmol / L, dispersed in the original volume.

[0047] Step 1.2, slowly add 100 μL of 4-NBT solution into the ultrasonic tank, the solution concentration is generally greater than 8mmol / L, such as 9mmol / L, 10mmol / L, 11mmol / L, etc., let it stand for 5-20 minutes for adsorption, and then centrifuge and wash for more The second time, redispersed in 1 mL of 50 mmol / L CTAC to obtain gold core particles coated with 4-NBT.

[0048] Step 1.3, mix 16mL of 50mmol / L CTAC and 800μL of 3-7mmol / L (such as 3.42mmol / L, 4.86mmol / L,...

Embodiment 3

[0052] Embodiment 3: Use steganographic ink to write information and read it, such as figure 1 shown.

[0053] Using the steganographic ink based on embedded 4-NBT Raman molecules synthesized in Example 2, dip an appropriate amount with a pen to write "Dragon" on paper, such as figure 1 Shown above left.

[0054] Select 6.25×6.5mm 2 The area is divided into 25×26 pixels, and the spectrum of the information is tested with a 10× lens of a confocal Raman spectrometer. The excitation wavelength is 785nm, and the laser power density is 4.6×10 4 W / cm 2 , the acquisition time is 1 second, get the Raman spectrum of each pixel, select 4-NBT 1310-1365cm -1 The integrated intensity of the Raman peak draws the Raman imaging graph, such as figure 1 lower left. The Raman imaging of the visible written information agrees well with the brightfield photographs. figure 1 The three spectra on the right correspond to three points in Raman imaging: 1 is the spectrum of paper, 2 and 3 are th...

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Abstract

The invention discloses a steganographic material and a steganographic method based on surface-enhanced Raman nanoparticles, and relates to the fields of materials and information security. The steganography material based on surface-enhanced Raman nanoparticles of the present invention is a mixed material in which surface-enhanced Raman nanoparticles are added to common materials. Surface-enhanced Raman nanoparticles are composed of metal nano-substrate and characteristic Raman molecules, and the metal nano-substrate is gold. In the steganographic method of the present invention, one or more steganographic materials and ordinary materials are used to respectively record information and perform encryption. Use Raman spectrometer to scan or image to read the Raman spectrum information of the steganographic material and the common material, use the algorithm to extract and optimize the coefficients of different components to obtain the best fitting spectrum, complete background noise elimination and different Combination and selection of steganographic materials to obtain hidden information and complete decryption. The invention has the characteristics of safety, low cost, strong signal, good light stability and environmental stability, and can carry out multiple information combination.

Description

technical field [0001] The invention relates to the fields of materials and information security, in particular to a steganographic material and a steganographic method based on surface-enhanced Raman nanoparticles. Background technique [0002] With the development of information technology, information security issues have become increasingly prominent. Information leakage will not only damage the privacy of individuals and enterprises, but may even seriously threaten national secrets and security. Therefore, the protection of important information has become a very urgent need. Steganography is a commonly used information protection technology, which refers to hiding the information you want to transmit in other information, so that anyone other than the intended recipient will know the transmission and content of the information. Compared with another traditional information protection technology - cryptography, the advantage of steganography is that the information tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/50C09D11/03C09D11/16C09D5/00
CPCC09D11/50C09D11/03C09D11/16C09D5/00
Inventor 叶坚顾雨清
Owner SHANGHAI JIAOTONG UNIV
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