[mirimir]

Right.

The Tinfoil Chat setup uses optocouplers to enforce one-way data transmission.[0] And one can use inexpensive CD-R and micro SD cards for single-use data transfer. But transferring anything but plain text is dangerous.

0) https://github.com/maqp/tfc

[infokiller]

Thanks for mentioning the octocouplers implementation, it looks very interesting and I'll look it. Other options I'm aware of to avoid USB and complex drivers/protocols:

- Scanning QR codes (for example https://air-gap.it/)

- Audio codes (for example https://github.com/romanz/amodem)

[mirimir]

Wow. That is very cool.

Edit: https://air-gap.it/ seems down. But https://github.com/airgap-it is up.

I wonder if one could cut up QR codes, and store pieces separately. If that were done in Gimp or whatever, there could be multiple copies of each piece.

[infokiller]

Do you mean sharding them using something like Shamir Secret Sharing, splitting in order to be able to transfer/store a large blob, or something else?

[mirimir]

I meant actually cutting them with a sharp knife, or scissors. So you could hide pieces in different places. For stuff like URLs, passphrases, wallet seeds, etc.