If I pair my Android phone and my laptop, I can share files over Bluetooth from the phone to the laptop. I’ve started finding this a really convenient method for me to send files to a Linux laptop without needing to install a separate app on either the phone or my laptop. Especially when I’m away from my home network (I use SFTP at home).
How secure is this? Is there encryption by default and could someone else nearby with a receiver potentially decode the file you’re sending?
I’ve been using Flying Carpet, and it works pretty well. You can read about the encryption decisions further down the ReadMe.
https://github.com/spieglt/FlyingCarpet?tab=readme-ov-file
It utilizes the LocalOnlyHotspot API, and the data is encrypted in transit (and any potential hacker would have to be on the WPA2-protected network that’s generated, anyway). I recommend reading more about it yourself and not just taking my word for it.