SQR codes

Example of a normal QR code (This page), not SQR

Another example of a QR code, not SQR

Secure Quick Response codes or SQR codes are secure two dimensional barcodes with high data density, based on QR codes.^[1]

Secure Quick Response codes are a secure method for encrypting data into a barcode. It makes it extremely difficult to decode into the original plain text in the absence of the encryption cipher or key. A typical implementation of SQR codes would be to create a one-time use SQR code on a mobile phone's screen to effectively create a highly secure one-time pad type of encryption of, for example, an online account number.

A typical implementation is to encrypt and use a precursor physical machine readable token such as the card identity number (CID) written in read-only memory (ROM) of a Secure Digital microSD card contained in a mobile telephone. The international mobile identity number may be used where no microSD card is present, for example, on an Apple iPhone.

SQR codes may be securely read in a retail environment at the point of sale using 2D barcode scanners or even a low cost web camera. Secure Quick Response codes were first developed by Yodo, a company operating in Japan, and are patent pending.

SQR Codes Media

A QR code for the URL of the English Wikipedia Mobile main page
QR codes can be displayed on buildings, such as this one being painted in Cape Town.
Structure of a QR code (version 7), highlighting functional elements
A QR code used on a large billboard in Japan, linking to the sagasou.mobi website
QR codes have been used and printed on train tickets in China since 2010.
A sign with a QR code that links to a drinks menu
A QR code to automatically join a Wi‑Fi network
QR code tile next to the grave of Wing Commander Adrian Warburton at Durnbach War Cemetery in Gmund am Tegernsee, Germany. The QR code refers to his Wikipedia entry and can be successfully scanned from this image
A QR code that links to an obituary and can be placed on a headstone
Two QR codes that link to German contact tracing app check-ins during the COVID-19 pandemic

References

↑ Goel, Nishant; Sharma, Ajay; Goswami, Sudhir (May 2017). "A way to secure a QR code: SQR". 2017 International Conference on Computing, Communication and Automation (ICCCA): 494–497. doi:10.1109/CCAA.2017.8229850. ISBN 978-1-5090-6471-7. S2CID 223083.

[1] Goel, Nishant; Sharma, Ajay; Goswami, Sudhir (May 2017). "A way to secure a QR code: SQR". 2017 International Conference on Computing, Communication and Automation (ICCCA): 494–497. doi:10.1109/CCAA.2017.8229850. ISBN 978-1-5090-6471-7. S2CID 223083.

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