or just use a yubikey... it costs ~$50
https://news.ycombinator.com/item?id=12353605
https://www.theatlantic.com/technology/archive/2016/08/wi-fi...
1: https://ieeexplore.ieee.org/document/7457075
I'm not aware of an iOS app named "rsync" and ... presumably you don't have a shell ... ?