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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.