post a message _to_ a group

[dominictarr]

while thinking about multiple device support for ssb/patchwork I started wondering about posting a message to a group (i.e. readable by all devices in that group)

If we made the group shared key a curve25519 key then it would mean someone who is not a member of that group could post a message to that group just like they could to a regular feed.

hmm, although, that would mean doing two asym operations (or N, depending on how many groups you are in) for each encrypted message, which would scale a lot worse than one way groups