The world’s most secure QR codes


Jevan Meruga: We need to make this QR code using an Auto-CAD file and then we make it compatible with our printing machine at the School of Mines (and Technology) We start printing with our ink, this is the ultrasonic atomizer we have and we usually use 1ml (milliliter) of ink. It starts atomizing the ink and once we have the atomizer flow value it takes the ink through the pipe and then once we get the sheath it prints the ink through the sheath onto the substrate So far we have successfully printed lines of about 50 microns with the controlled parameters The paper samples that we printed on, we don’t see anything, so it is totally covert and the designs are robust This is the 980nanometer laser that we have which has 8 watts of power. So once we excite the QR codes using the 980 nanometer laser they show up in green colour because of upconversion So, this IR (infra-red light) will be upconverted to visible light at 5,000 nanometers wavelength because of the upconverting nanoparticles Using a camera with the IR (cut-off infra-red) lens, so that it blocks out the infra-red light and we can see the upconversion into visible light and just the QR code. Once we have the QR code we scan it using a smartphone with a QR code application. It readily scans into what we have already put into the QR code. In this case we used our school’s name, SDSMT, South Dakota School of Mines and Technology So we have different sets of upconverting nanoparticles; one upconverts into green, one upconverts into blue. We use both of them to create the upconverting QR codes as I have shown you in this video By using the two inks we can increase the potential of the security printing because we can vary the sizes of the characters of the alphabet or symbols that we insert into the QR code, from microscopic to macroscopic levels. So once we print something microscopic, we can embed them into the QR code, so we are making it at forensic level

5 thoughts on “The world’s most secure QR codes

  1. Sincerly I think that a solution that requires the use of a laser to verify the authenticity of a product is useless for the buyer

  2. Hi Lazzaro79, IR technology is very accessible but security printing isn't for a mass market either for the moment, at least.

  3. It's not going to be useful for a regular business, but when it comes to banks and government, and places where document authenticity is an issue, is where this becomes useful.

  4. Coming from a software perspective, why not print it clearly and encode an encrypted code, that can only be decrypted by a central government server, so in order to verify simply scan it with a regular phone, upload to a server and the server verifies with a simple true/false response.

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