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Hi Deborah, Thank you so much for giving it more thought and kindly sharing them! I guess I'm thinking even more of security now having produced a panel of 6 experts re: Economic Crimes plus I've had a couple of phishing expeditions this week as well. Maybe one day these miscreants will phish our QR code business cards for their benefit? Commerce -vs- Security will always be with us. I know some people print their Word docs to PDF thinking it will make it more challenging to change content in a document without a PDF modifier and then they pw protect that PDF ... and so it goes. :) I've heard fraudsters have created their own bard codes then visit a retailer and apply those bard codes to gift cards and take those "modified" gift cards to the cashier who scans them and it diverts the balance of that gift card to that miscreant's bank or crypto account. Beyond my pay scale! Thank you so much. Charles. Charlotte County Public Library Date: Mon, 4 Dec 2023 21:16:25 +0000 From: "Fitchett, Deborah" <[log in to unmask]> Subject: Re: QR Code replacement for business card I think you've still got a more complicated idea of what a QR code is than what it actually is. Think of a barcode on an item at the supermarket (or the back of a book). The combination of different thicknesses of lines encodes a set of numbers in a standardised way that can be read by barcode scanners. And typically those numbers are also printed directly underneath for when the scanners fail and they have to be typed in manually by the checkout operator - it's not a *secret* code, it's just for machine convenience. Could you hack a barcode on a chocolate bar? I guess you could get out a sharpie and with a very steady hand thicken a line so the scanner sees it as a different number and charges you for, I don't know, a tin of tuna instead. Or more easily, take a barcode off another product and wave that over the scanner instead. But that would only affect the chocolate bar in your hand - every other chocolate bar in the store will still scan as a chocolate bar. <snip>