[est31]

> accept that there is no confidentiality anymore. It's just not realistic to have a "secret" group with that many members

You do have a point, especially when it's a group where people are in their free time. However, if they are present for work they are less likely to leak information. Also, encryption should give a default level of privacy to build on.

[ccktlmazeltov]

right, but how much do we want key rotation as a priority when a member leaves? What are the chances they're going to collude with whoever can see the traffic?