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New security: hidden qr code

The editor:Huizhou sihui technology development co., LTD Release time:2018/10/11Browse the passengers:156time

Have you ever thought that qr codes on billboards and flyers could be used for security? Can be a common two-dimensional code is a feature can be copied at will, how can anti-counterfeiting? Researchers have come up with a way for us to make qr codes invisible. (all QR codes in this article are QR codes)
Two new anti-counterfeiting technologies have emerged in recent years: fluorescent dyes that appear only when exposed to specific wavelengths of light, and printing techniques that mimic insects' dazzling butterfly wings. The unique feature of fluorescent dyes is that if a substance is mixed with this dye, the PH value, viscosity and other properties of the substance will change the wavelength required for the dye to appear. Counterfeiters must make the substance exactly the same to pass the anti-counterfeiting. Butterfly wing printing USES nanoparticles to mimic the tiny scales on an insect's wing. The different arrangement of nanoparticles changes the way the print reflects light. Using these two technologies, researchers at the University of South Dakota and South Dakota School of Mines and technology have developed a new kind of invisible qr code that works only when scanned by a laser, making it nearly impossible for counterfeiters to copy. The technology could one day be used in areas such as currency, bills and expensive alcohol and tobacco.
The researchers used AutoCAD, a computer-aided design software, to draw the qr code. Then they mixed lanthanide nanoparticles with blue and green fluorescent inks to create the particles needed to create the qr code. These dyed nanoparticles are sprayed onto objects via an aerosol jet printer, creating products that are invisible to the naked eye, unlike traditional qr codes. To see the images, people use near-infrared lasers, which are then scanned by scanners such as smartphones to verify the authenticity of the goods. In other words, using the anti-counterfeiting feature requires an infrared camera on the smartphone, or an infrared laser strafing device provided by the merchant, which can then scan the image with the smartphone.
While small nanoparticles sound fragile, experiments have shown that the material is highly stable. The researchers printed the invisible qr code on a piece of paper and found it could still be scanned after 50 folds. Fifty tests may not be enough to determine whether fluorescent inks can be damaged by folding and rubbing, and researchers will need to do a lot of wear testing before applying the anti-counterfeiting technology to currencies.
Because the process of producing the invisible qr code technology is complex, it takes 90 minutes from design to production, making it even more difficult for others to fabricate the code. If anyone wants to fake it, they must have a blueprint of the arrangement of nanoparticles, know the ratio of the nanoparticles to the printed light dye, and decipher the information in reverse.
However, the production of hidden qr codes takes so long that the technology needs to be further improved, but its existence does provide an unparalleled choice for units and individuals with urgent anti-counterfeiting needs.