Signal will do end-to-end encryption if it is one-on-one, but what about groups? In the case of Teregram, I did not encrypt the group, so I wondered what would be the case of Signal.
Yes, groups are end-to-end encrypted, there’s just more than two “ends”. Signal (the company/server) still can’t read your messages.
The Signal server also won’t know that you are messaging a group or that groups exists.