Feature: Encrypted/Authenticated QR / Dual Layer QR codes

[sambacha]

Encoded Private Messaging on QR Codes

https://www.denso-wave.com/en/system/qr/product/sqrc.html

This system encodes both public and private messages simultaneously in a single QR code through textured pattern substitution and cryptographic techniques.

Public message $(M_pub)$: Standard QR content readable by any scanner
Private message $(M_priv)$: Hidden content requiring specialized decoding
q = 8 distinct textured patterns (P = {P₁, P₂, ..., P₈})
Each pattern encodes $log₂(8) = 3$ bits of information
Cryptographic $key$ $(K)$ for private message scrambling

you can see the rest of the outline in the prompt file in the repo below

A.I generated slop PoC here https://www.denso-wave.com/en/system/qr/product/sqrc.html

What needs to be fixed:
formalized patterns
crypto stuff
more use cases

Basically, what do you think? Not asking to add this to the qr package

[paulmillr]

Seems interesting. So it is like steganography? There is a public message, and separate, hidden private message?

[sambacha]

Seems interesting. So it is like steganography? There is a public message, and separate, hidden private message?

exactly, sorry for late reply. There is another approach that implements this without the usage of non-standard texture patterns that would probably be more approrpriate