Nayuki explains the creation side of QR codes very...

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Nayuki explains the creation side of QR codes very well, including the selection of the mask.
https://www.nayuki.io/page/creating-a-qr-code-step-by-step

It is not only the ECC area that is malleable, the entire code is. Actually, *before* a QR reader starts decoding the content, it checks for (and fixes) errors in the content with help of the ECC bits.

So, a malicious user could create a code which a human would decode differently from a computer…

@whybird @cybeardjm @blinry @piko

Like 22 January at 6:14 | Wall-to-wall | Open on waldvogel.family

3 comments

Mark Whybird

@marcel @cybeardjm @blinry @piko Superb. Thank you!

22 January at 6:48 | Open on aus.social

lgvs

@marcel
Thank you, I was just about to ask how mask was chosen! Really interesting.

@whybird @cybeardjm @blinry @piko

23 January at 8:51 | Open on mastodon.bida.im

Marcel Waldvogel

@lgvs @whybird @cybeardjm @blinry @piko I don't think it is mentioned on the page, but in the code: To minimize uniform-color areas and eye-like patterns.

23 January at 18:17 | Open on waldvogel.family