Post AtkkbAFMYnENNql55E by crypticcelery@chaos.social
(DIR) More posts by crypticcelery@chaos.social
(DIR) Post #AthMADHqAXS4cReZRw by foone@digipres.club
2025-05-02T23:08:48Z
3 likes, 3 repeats
I wonder if anyone has written code to figure out how to modify a QR code with a minimum of changes, to make it point to a url you control?Like, "sharpie in a pixel here and here, and now that MLM sticker on the stop sign goes to goatse"
(DIR) Post #AthMVE6CLPMJDfEAhk by sternecker@infosec.exchange
2025-05-02T23:12:27Z
0 likes, 0 repeats
@foone “what is the New traveling salesman problem?”Ohh, how about “Towers of Annoy”
(DIR) Post #AthNR1YR8tu36ozofI by kinsale42@mstdn.games
2025-05-02T23:23:01Z
0 likes, 0 repeats
@foone Rickroll them
(DIR) Post #AthNw7nfyFg1SOxD5k by geoffl@mastodon.me.uk
2025-05-02T23:28:38Z
0 likes, 1 repeats
@fooneNot trivial with the error correction and redundency in QR codes. This is a working QR code after all.
(DIR) Post #AthPTqLtRsvV8ubKGu by the_moep@mastodon.de
2025-05-02T23:45:58Z
0 likes, 0 repeats
@fooneReally depends on the redundency/error correction level selected when it was generated. If it's basically 1 it should be pretty straight forward but most generators probably don't create such simple codes.Switching a single character with 6 to 10 modifications shouldn't be too hard though, but do you really want to buy a new domain for each different code code?
(DIR) Post #AthRftEmkMAbTV9FlQ by Video_Game_King@digipres.club
2025-05-03T00:10:26Z
0 likes, 0 repeats
@foone No, but that does give me the idea to sabotage QR codes I don't like by sharpie'ing pixels onto random spots.Well, it DID before I thought to look up whether QR codes have any kind of error correction (they do).
(DIR) Post #AthaJExkhoePmWSKQ4 by InkomTech@infosec.exchange
2025-05-03T01:37:15Z
0 likes, 0 repeats
@foone seems reminiscent of hacks that padded files to match a checksum. Forcing to a desired url might suck (not enough bits in a qr, plus it’s intrinsic error correction). Forcing to where new qr (including error correction) was a url, though…. Seems possible.
(DIR) Post #AthzDdGFwvcCG5X8yG by genmaicha@stereophonic.space
2025-05-03T06:26:52.276028Z
0 likes, 1 repeats
@foone Russ Cox wrote an article about QR code hacking - not exactly what you describe, but he explains the math behind it and you may be able to figure out your idea from that.https://research.swtch.com/qart
(DIR) Post #AtiuhCMwC3EevctiBU by anildash@me.dm
2025-05-03T17:10:23Z
0 likes, 0 repeats
@foone I was thinking about this the other way, minimal changes to existing popular images to turn them into functional QR codes
(DIR) Post #Atj9YZR0Z6APAh94y0 by henryk@chaos.social
2025-05-03T19:56:56Z
0 likes, 0 repeats
@foone Well fuck, I had thought about many QR things, but that is actually a good idea.Error correction is a problem, but not a big one. In the end it means that you need to flip 3 or so pixels in order to flip a data bit.The biggest obstacle is that a QR code has more parameters than are typically available in QR code generation APIs, specifically the mask, which affects almost all pixels.
(DIR) Post #AtjsiVuN1jML4Fzjto by mathaetaes@infosec.exchange
2025-05-04T04:22:56Z
0 likes, 0 repeats
@foone just sticking a different QR code on top of the existing would be much easier.
(DIR) Post #Atju6Swlmwg2mt6OzQ by rfc6919@aus.social
2025-05-04T04:38:28Z
0 likes, 0 repeats
@foone Russ Cox’s QArt? https://research.swtch.com/qart
(DIR) Post #AtkRc922fF6imCHWLo by queenparamount@post.lurk.org
2025-05-04T10:53:07Z
0 likes, 0 repeats
@foone I worked on a project in which we found 3 methods on how to make a QR code unusable with a minimum of changes, but to make it point seems like a whole different challenge. I am having lots of checking the replies
(DIR) Post #AtkkbAFMYnENNql55E by crypticcelery@chaos.social
2025-05-04T14:26:39Z
0 likes, 0 repeats
@foone if it doesn’t exist, that sounds really interesting, but also finding the targets could be difficult…It does sound like a cool thing to build though…
(DIR) Post #AtmpAdfVx0Yqtz56o4 by efi@chitter.xyz
2025-05-05T14:27:17Z
0 likes, 0 repeats
@foone I believe I've seen this before, yes
(DIR) Post #AtnOEATvuBjjw15BUe by gsuberland@chaos.social
2025-05-05T21:00:05Z
0 likes, 0 repeats
@foone heh, QR malleability attacks
(DIR) Post #Au1grWJTBoQWKCXeHA by BigHeadMode@social.linux.pizza
2025-05-12T18:34:51Z
0 likes, 0 repeats
@foone there's an AI model to generate QR codes from images. actually at least 2, one is far more impressive.https://arstechnica.com/information-technology/2023/06/redditor-creates-working-anime-qr-codes-using-stable-diffusion/https://www.qrblend.com/