 |
 |
True. I probably should have called it "redundancy-tradeoff-space" or "sacrificial space". On Friday, December 1, 2023 at 16:13, Thomas Dowling eloquently inscribed: > 'Some QR codes have "favicon" graphics in dead-space of the QR code where > they are ignored by the QR reader..' > > I'm not sure it's fair to call it dead space. The cute little graphic in > the middle of your QR code is taking advantage of - but also eating into - > the redundancy and error correction built into the format. IOW, it > deliberately damages the QR code knowing that it can get away with > it, which it mostly can on web pages. Problems might arise once Charles' > business card has gotten a little worn, or creased, or had some coffee > spilled on it. > > On Fri, Dec 1, 2023 at 3:38 PM Hammer, Erich F <[log in to unmask]> wrote: > >> Charles, >> >> Think of your QR code like a braille business card; A sighted recipient >> would need to get it translated, but it's just your text information. If a >> blind, evil genius came along, what could they do with it? >> >> Some QR codes have "favicon" graphics in dead-space of the QR code >> where they are ignored by the QR reader, but you can't encode a logo >> into the QR code any more than you could convert a logo into braille. >> >> Erich >> >> >> PS: A related and little known -- by sighted people -- fact: Braille is >> heavily encoded and distinctly not "regular text" printed in a raised-dot >> font. >> >> >> On Friday, December 1, 2023 at 14:52, Charles Meyer eloquently inscribed: >> >>> Tamarra and Deborah et al, >>> >>> Thank you for your posts and questions. >>> >>> Thanks to Erich I was able to create a QR code with zint although it >>> doesn’t seem to allow me to add our County Library logo. >>> >>> It does give me pause re: how that QR code could be used nefariously? >>> >>> If I just invite a person to read my QR code with their cell phone QR >>> reader could they misappropriate that QR code for unapproved activity? >>> >>> Fascinating conversation. >>> >>> I so appreciate all these helpful posts. >>> >>> Charles. >>> >>> Date: Thu, 30 Nov 2023 09:12:50 -0800 >>> From: Tamara Marnell <[log in to unmask]> >>> Subject: Re: QR Code replacement for business card >>> >>> A QR code just represents a string. If anything gets embedded, it will >>> be visible in the text. Like in Joe's example, you'd see a different >>> domain that forwards to the URL you wanted. If you test it and the >>> decoded string is exactly what you put into the generator, it's fine. >>> (Whether the website you visited to generate that code is safe is a >>> different question, so I second the recommendation of Zint or the >>> tools built into your browser.) >>> >>> Most security risks of QR codes are really to the users. If the codes are >>> posted in public places--like those little cards on restaurant tables to >>> pay for your meal--someone could theoretically cover them up with a >>> different code that tricks patrons into giving away their sensitive >>> information, or downloads malware to their phones, etc. >>> >>> -Tamara >> >> >>