Also, burn keys after each message. Never reuse non-rendezvous keys and preferably set up new rendezvous keys for each group, groups or entities with which you collaborate and rotate rendezvous keys regularly. Finally, never respond on a regular schedule or too quickly. Delay is your friend. Delay adds noise and makes it harder to connect the metadata you're generating to your data trail thus revealing the connection and breaking one layer of your hopefully multilayered defence.