Re:Encoding your WiFi access point password into a QR code
by matheusmoreira on Tuesday December 31, 2019 @07:23AM
(#21920548)
Are you using 8 bit encoding? An alphanumeric mode QR code containing base 64 encoded data provides less capacity. In binary mode even a 4096 bit RSA secret key fits while ECC keys produce smaller codes.
The qrencode tool has an 8 bit mode but not all decoders can handle binary data. For example, my phone shows me mangled results and I can't redirect them to a file. Like structured append, it doesn't seem to have much support.
The qrencode tool has an 8 bit mode but not all decoders can handle binary data. For example, my phone shows me mangled results and I can't redirect them to a file. Like structured append, it doesn't seem to have much support.
I've sent patches to ZBar improving this:
https://github.com/mchehab/zbar/pull/64
Hopefully it will make QR codes more useful for storing keys and other small files.