Just select the plugin on server and viewer site, the standard vnc password is used
![Image](https://www.uvnc.eu/download/1224/s11.jpg)
2) Long Password
Set the passphrase, this is now the password you need to enter on in the viewer
![Image](https://www.uvnc.eu/download/1224/s2.jpg)
3) Heavy encryption
You don't need to enter a password, but only the viewer with the correct key can connect
Generates key and save them in the server folder
In this case 20190108_Server_ClientAuth.pubkey is the server key
and 20190108_Viewer_ClientAuth.pkey is the viewer key
![Image](https://www.uvnc.eu/download/1224/s3.jpg)
Now copy the 20190108_Viewer_ClientAuth.pkey the viewer folder
![Image](https://www.uvnc.eu/download/1224/s44.jpg)