There was some tool for doing this securely on the command line. You run it with the file name and it gives you back a token. You give the token to your friend,

There was some tool for doing this securely on the command line. You run it with the file name and it gives you back a token. You give the token to your friend, they run the same tool with the token, and it downloads the file. Can’t for the life of me find it or remember what it was called. Wormhole? Edit: I guess it was magic wormhole, discussed elsewhere in this thread.