It uses a handful of built-in system commands on the respective platforms to set up the ad hoc network, and then writes the file in encrypted chunks over a TCP

It uses a handful of built-in system commands on the respective platforms to set up the ad hoc network, and then writes the file in encrypted chunks over a TCP socket. It's totally possible to extend this to Linux, I just haven't looked into doing so yet. Not sure whether I'll tackle that or a GUI first. As for mobile, I'd love to do that as well, but I'm not sure how possible it is. I believe it would have to use Wi-Fi Direct on Android, and I'm not sure how much control you have over the network stack on iOS. I don't think either supports ad hoc networking so it would be a pretty different program at that point. But I don't have much experience with mobile development yet.