http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/blog/20230301-simplex-file-transfer-protocol.html
We also looked at a few independent implementations of file sharing, with some ad-hoc protocols (e.g., ceph and lufi ), but neither seemed sufficiently mature, and also not as private as we would like. So after a lot of searching we decided to design and implement a new protocol for file transfers, that both solved the problems above, and provided a higher level of metadata privacy than any other file transfer solution has.