Copy the cert and key that you made into the ~/.config/quassel-irc.org/certs directory. Quassel will not use the PEM file. Make sure the filesystem permissions restrict read access for the files to just you. mv mynick.cert ~/.config/quassel-irc.org/certs mv mynick.key ~/.config/quassel-irc.org/certs Click Settings and Configure Quassel. In the IRC section of settings, click Identities. Then click the Read more »