I didn't mean to suggest using audio. I mentioned it because normally protocols for data over audio use these kinds of methods to transmit the data in noisy/lossy channels, we can apply the same principles here. I think the interesting thing would be to have a way to transmit the tokens without assuming there is an internet connection, right? Because if there is internet, why use lora?

On the other hand, what kind of keys are they? In any case you can always sha256 digest and get a key out of any string.