Magic Wormhole: a secure, easy way to send files from computer to computer https://github.com/warner/magic-wormhole
Lots of good ideas here http://www.lothar.com/~warner/MagicWormhole-PyCon2016.pdf
Now (largely) also supports Tor https://magic-wormhole.readthedocs.io/en/latest/tor.html
@cwebber I prefer the (simpler) `woof` for transfers across a trusted internal network, but Magic Wormhole seems to be well-implemented in general for the more complex cases.
Haven't checked to see if you can run your own intermediate/proxy, if so that would be excellent.
@jim @cwebber there's two servers, https://github.com/warner/magic-wormhole-mailbox-server for the SPAKE exchanges and https://github.com/warner/magic-wormhole-transit-relay for relaying data after the key agreement
closed but only by documentation, unless they later also increased the number of channels?