Sure, but you gotta admit that you’re an extreme edge case of a group of users that are already kinda edge cases.  Most people have QR readers and just don’t realize it.  Very few people would need this kind of offline method anyhow, and those that would probably have much better spycraft than we can dream up here, stuff far beyond putting RFIDs on postcards or QR codes on traffic poles.  

The size BTW is arbitrary and can be changed within reason in software, but you want fairly high resolution if you plan to print it.  300 ppi at 2K res would give you around 6 inches size printed.   A 1,000 by 1,000 file would make a nice 3x3 inch sticker or back of a postcard.  

-Ryan McGinnis
http://www.bigstormpicture.com
PGP Fingerprint: 5C73 8727 EE58 786A 777C 4F1D B5AA 3FA3 486E D7AD


On Tue, Oct 6, 2020 at 17:43, Stefan Claas <s...@300baud.de> wrote:
Ryan McGinnis via Gnupg-users wrote:

> Perhaps just use QR codes?  Easily scanned and imported by a digital
> device.  Message size is limited, but probably enough.  If not, you can
> maybe use multiple QR codes.  This reply, encrypted to you, is contained
> in the linked QR below:

Well, I currently have no QR-Code Software installed and I need to do then
some test with your fairly large image (2000x2000 pixels in size, 72 dpi).

Regards
Stefan

--
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The computer helps us to solve problems, we did not have without him.


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