My understanding is that the standard for storing a public key in a computer file is: store that key as a long string of hex digits in a file in PKCS #12 format.
I suppose I could simply print out out a long string of hex digits on paper (either the short public key fingerprint used to confirm a public key from some other source -- see " How should I distribute my public key? " -- or perhaps print the entire full public key). Then my friends could manually type them in. But it seems like it might be more convenient and less error-prone if I to print some sort of barcode on my business cards containing the same data, such as a "Data Matrix code" or an "Aztec Code" or a "QR code".
Is there a standard for printing a public key as a barcode?
Is there a standard for printing a public key fingerprint as a barcode?