Quote from: NotATether on September 30, 2021, 02:26:33 PM

Quote from: larry_vw_1955 on September 30, 2021, 11:26:19 AM

I need a way to store more information than just the seed words. For each wallet, I figure I might need upwards of 1000 characters. Possibly I'd like to store multiple wallets all at once. So looking at maybe 5000 to 10000 characters. 10 kb. I need to be able to print out an encrypted image on a piece of paper. That would be my cold storage. When I'm ready to redeem, I will scan the image back in and decrypt its contents. And recover the original text file containing all my important seed phrases. I think this would be more secure than putting it on a flash drive since paper can last longer. Hundreds of years. then only problem is that you can't really use qrcodes for that. they would literally be huge.

You can encrypt the wallet with AES256, encode the wallet in BASE64 using some easy-to-parse computer font such as Courier New or System (they must be monospaced so they can be perfectly read again using OCR), and then print out the characters onto a large number of sheets of paper. Then you save the AES key and IV as qrcodes. Store all materials in a confidential place such as inside a safe.

In general, the idea of using QR codes is very good. Compared to plain text, they have pretty good error correction, so if the paper is partly damaged it will be still possible to decode them. They're also made specifically for scanning and reading into a computer via camera input, so you won't need to rely on the quality of an OCR software, even if those get better and better. Decoding QR via camera will be much more resilient and reliable.