Note: This feature is currently in beta. Encrypted messages of encrypted rooms will not be found by search operations. The mobile apps may not support the encypted messages (currently under implementation). Bots may not be able to see encrypted messages until they implement support for it. Uploads will not be encrypted in this version.
Once your servers admin has enabled End to End Encryption as an option you will see a banner across the top of your interface like this:
If you click this banner you will be presented with a dialog containing a password. Rocket.Chat server does not know this password. So you will need to store it in your password manager along with your login password.
You will need this password on any other device you wish to participate in end to end conversations.
Once you have this password saved somewhere it is safe to dismiss the alert.
If you would like to change your encryption password you can do so by going to: My Account->Encryption
Once you make this change it will be used for connecting on new devices.
Click the channel creation icon
From this screen on private groups you can toggle Encrypted to on
You can convert existing groups and direct messages to use end to end encryption.
As a room owner you can click the room info icon
Once this is up click the edit button
From here scroll to the bottom and toggle encrypted on
If the room is using End to End Encryption you should see a key icon by the channel name.
You will see a key icon by the username.